Re: [PATCH v3] i2c: busses: i2c-pxa.c: Fix for possible null pointer dereferenc
> Ok then, Wolfram! > > Keep only: > > ereqirq: > clk_disable_unprepare(i2c->clk); > > And let everyone else just return? I haven't looked at the details, but when you simply can return, do it. > It is rather pointless to add something in a patch, to remove it in the next. Yup, just say in the patch description that it fixes this bug. signature.asc Description: Digital signature
Re: [PATCH v3] i2c: busses: i2c-pxa.c: Fix for possible null pointer dereferenc
Ok then, Wolfram! Keep only: ereqirq: clk_disable_unprepare(i2c-clk); And let everyone else just return? I haven't looked at the details, but when you simply can return, do it. It is rather pointless to add something in a patch, to remove it in the next. Yup, just say in the patch description that it fixes this bug. signature.asc Description: Digital signature
Re: [PATCH v3] i2c: busses: i2c-pxa.c: Fix for possible null pointer dereferenc
2014-07-04 19:24 GMT+02:00 Emil Goode : > Hello, > > I noticed one more thing. > > On Fri, Jul 04, 2014 at 07:07:48PM +0200, Rickard Strandqvist wrote: >> 2014-07-04 11:10 GMT+02:00 Emil Goode : >> > Hello Rickard, >> > >> > Since this is a probe function there is also no need to release the devm_* >> > resources in the i2c_pxa_remove function, this leads to double free. >> > >> > Also I have a few nit-pick comments below. >> > >> > On Thu, Jul 03, 2014 at 10:19:16PM +0200, Rickard Strandqvist wrote: >> >> Fix for possible null pointer dereferenc, and there is a risk for memory >> >> leak if something unexpected happens and the function returns. >> >> It now use Managed Device Resource instead. >> >> >> >> Signed-off-by: Rickard Strandqvist >> >> >> >> --- >> >> drivers/i2c/busses/i2c-pxa.c | 37 - >> >> 1 file changed, 16 insertions(+), 21 deletions(-) >> >> >> >> diff --git a/drivers/i2c/busses/i2c-pxa.c b/drivers/i2c/busses/i2c-pxa.c >> >> index be671f7..2edb633 100644 >> >> --- a/drivers/i2c/busses/i2c-pxa.c >> >> +++ b/drivers/i2c/busses/i2c-pxa.c >> >> @@ -1141,10 +1141,10 @@ static int i2c_pxa_probe(struct platform_device >> >> *dev) >> >> struct resource *res = NULL; >> >> int ret, irq; >> >> >> >> - i2c = kzalloc(sizeof(struct pxa_i2c), GFP_KERNEL); >> >> + i2c = devm_kzalloc(>dev, sizeof(struct pxa_i2c), GFP_KERNEL); >> >> if (!i2c) { >> >> ret = -ENOMEM; >> >> - goto emalloc; >> >> + goto err_nothing_to_release; >> > >> > Perhaps its a good idea to return directly here, then the label >> > err_nothing_to_release can be removed. >> > >> >> } >> >> >> >> /* Default adapter num to device id; i2c_pxa_probe_dt can override. >> >> */ >> >> @@ -1154,18 +1154,19 @@ static int i2c_pxa_probe(struct platform_device >> >> *dev) >> >> if (ret > 0) >> >> ret = i2c_pxa_probe_pdata(dev, i2c, _type); >> >> if (ret < 0) >> >> - goto eclk; >> >> + goto err_nothing_to_release; >> > >> > Same here. >> > >> >> >> >> res = platform_get_resource(dev, IORESOURCE_MEM, 0); >> >> irq = platform_get_irq(dev, 0); >> >> if (res == NULL || irq < 0) { >> >> ret = -ENODEV; >> >> - goto eclk; >> >> + goto err_nothing_to_release; >> > >> > Same here. >> > >> >> } >> >> >> >> - if (!request_mem_region(res->start, resource_size(res), res->name)) >> >> { >> >> + if (!devm_request_mem_region(>dev, res->start, >> >> + resource_size(res), res->name)) { >> >> ret = -ENOMEM; >> >> - goto eclk; >> >> + goto emalloc; >> > >> > We could also return directly here since the release_mem_region call should >> > be removed, as mentioned in Jingoos reply. >> > >> >> } >> >> >> >> i2c->adap.owner = THIS_MODULE; >> >> @@ -1176,16 +1177,16 @@ static int i2c_pxa_probe(struct platform_device >> >> *dev) >> >> >> >> strlcpy(i2c->adap.name, "pxa_i2c-i2c", sizeof(i2c->adap.name)); >> >> >> >> - i2c->clk = clk_get(>dev, NULL); >> >> + i2c->clk = devm_clk_get(>dev, NULL); >> >> if (IS_ERR(i2c->clk)) { >> >> ret = PTR_ERR(i2c->clk); >> >> - goto eclk; >> >> + goto emalloc; >> > >> > Same here. >> > >> >> } >> >> >> >> - i2c->reg_base = ioremap(res->start, resource_size(res)); >> >> - if (!i2c->reg_base) { >> >> + i2c->reg_base = devm_ioremap_resource(>dev, res)); >> >> + if (IS_ERR(i2c->reg_base)) { >> >> ret = -EIO; >> >> - goto eremap; >> >> + goto emalloc; >> > >> > Same here. >> > >> >> } >> >> >> >> i2c->reg_ibmr = i2c->reg_base + pxa_reg_layout[i2c_type].ibmr; >> >> @@ -1227,10 +1228,10 @@ static int i2c_pxa_probe(struct platform_device >> >> *dev) >> >> i2c->adap.algo = _pxa_pio_algorithm; >> >> } else { >> >> i2c->adap.algo = _pxa_algorithm; >> >> - ret = request_irq(irq, i2c_pxa_handler, IRQF_SHARED, >> >> - dev_name(>dev), i2c); >> >> + ret = devm_request_irq(>dev, irq, i2c_pxa_handler, >> >> + IRQF_SHARED, dev_name(>dev), i2c); >> >> if (ret) >> >> - goto ereqirq; >> >> + goto emalloc; >> > >> > Same here. >> > >> >> } >> >> >> >> i2c_pxa_reset(i2c); >> >> @@ -1261,15 +1262,9 @@ static int i2c_pxa_probe(struct platform_device >> >> *dev) >> >> eadapt: >> >> if (!i2c->use_pio) >> >> free_irq(irq, i2c); >> > >> > The free_irq() call should also be removed since devm_request_irq() was >> > used. >> > >> >> -ereqirq: >> >> - clk_disable_unprepare(i2c->clk); > > I think we should keep the clk_disable_unprepare() call. > >> >> - iounmap(i2c->reg_base); >> >> -eremap: >> >> - clk_put(i2c->clk);
Re: [PATCH v3] i2c: busses: i2c-pxa.c: Fix for possible null pointer dereferenc
2014-07-04 19:24 GMT+02:00 Emil Goode emilgo...@gmail.com: Hello, I noticed one more thing. On Fri, Jul 04, 2014 at 07:07:48PM +0200, Rickard Strandqvist wrote: 2014-07-04 11:10 GMT+02:00 Emil Goode emilgo...@gmail.com: Hello Rickard, Since this is a probe function there is also no need to release the devm_* resources in the i2c_pxa_remove function, this leads to double free. Also I have a few nit-pick comments below. On Thu, Jul 03, 2014 at 10:19:16PM +0200, Rickard Strandqvist wrote: Fix for possible null pointer dereferenc, and there is a risk for memory leak if something unexpected happens and the function returns. It now use Managed Device Resource instead. Signed-off-by: Rickard Strandqvist rickard_strandqv...@spectrumdigital.se --- drivers/i2c/busses/i2c-pxa.c | 37 - 1 file changed, 16 insertions(+), 21 deletions(-) diff --git a/drivers/i2c/busses/i2c-pxa.c b/drivers/i2c/busses/i2c-pxa.c index be671f7..2edb633 100644 --- a/drivers/i2c/busses/i2c-pxa.c +++ b/drivers/i2c/busses/i2c-pxa.c @@ -1141,10 +1141,10 @@ static int i2c_pxa_probe(struct platform_device *dev) struct resource *res = NULL; int ret, irq; - i2c = kzalloc(sizeof(struct pxa_i2c), GFP_KERNEL); + i2c = devm_kzalloc(dev-dev, sizeof(struct pxa_i2c), GFP_KERNEL); if (!i2c) { ret = -ENOMEM; - goto emalloc; + goto err_nothing_to_release; Perhaps its a good idea to return directly here, then the label err_nothing_to_release can be removed. } /* Default adapter num to device id; i2c_pxa_probe_dt can override. */ @@ -1154,18 +1154,19 @@ static int i2c_pxa_probe(struct platform_device *dev) if (ret 0) ret = i2c_pxa_probe_pdata(dev, i2c, i2c_type); if (ret 0) - goto eclk; + goto err_nothing_to_release; Same here. res = platform_get_resource(dev, IORESOURCE_MEM, 0); irq = platform_get_irq(dev, 0); if (res == NULL || irq 0) { ret = -ENODEV; - goto eclk; + goto err_nothing_to_release; Same here. } - if (!request_mem_region(res-start, resource_size(res), res-name)) { + if (!devm_request_mem_region(dev-dev, res-start, + resource_size(res), res-name)) { ret = -ENOMEM; - goto eclk; + goto emalloc; We could also return directly here since the release_mem_region call should be removed, as mentioned in Jingoos reply. } i2c-adap.owner = THIS_MODULE; @@ -1176,16 +1177,16 @@ static int i2c_pxa_probe(struct platform_device *dev) strlcpy(i2c-adap.name, pxa_i2c-i2c, sizeof(i2c-adap.name)); - i2c-clk = clk_get(dev-dev, NULL); + i2c-clk = devm_clk_get(dev-dev, NULL); if (IS_ERR(i2c-clk)) { ret = PTR_ERR(i2c-clk); - goto eclk; + goto emalloc; Same here. } - i2c-reg_base = ioremap(res-start, resource_size(res)); - if (!i2c-reg_base) { + i2c-reg_base = devm_ioremap_resource(adev-dev, res)); + if (IS_ERR(i2c-reg_base)) { ret = -EIO; - goto eremap; + goto emalloc; Same here. } i2c-reg_ibmr = i2c-reg_base + pxa_reg_layout[i2c_type].ibmr; @@ -1227,10 +1228,10 @@ static int i2c_pxa_probe(struct platform_device *dev) i2c-adap.algo = i2c_pxa_pio_algorithm; } else { i2c-adap.algo = i2c_pxa_algorithm; - ret = request_irq(irq, i2c_pxa_handler, IRQF_SHARED, - dev_name(dev-dev), i2c); + ret = devm_request_irq(dev-dev, irq, i2c_pxa_handler, + IRQF_SHARED, dev_name(dev-dev), i2c); if (ret) - goto ereqirq; + goto emalloc; Same here. } i2c_pxa_reset(i2c); @@ -1261,15 +1262,9 @@ static int i2c_pxa_probe(struct platform_device *dev) eadapt: if (!i2c-use_pio) free_irq(irq, i2c); The free_irq() call should also be removed since devm_request_irq() was used. -ereqirq: - clk_disable_unprepare(i2c-clk); I think we should keep the clk_disable_unprepare() call. - iounmap(i2c-reg_base); -eremap: - clk_put(i2c-clk); -eclk: - kfree(i2c); emalloc: release_mem_region(res-start, resource_size(res)); +err_nothing_to_release: return ret; } Best regards, Emil Goode Hi All! Ok, so there is literally nothing to do release anymore. A good system Devres, I understand you want everyone to use it. I also think it is also better to return directly then. But who decides, Wolfram? Yes, Wolfram is the maintainer.
Re: [PATCH v3] i2c: busses: i2c-pxa.c: Fix for possible null pointer dereferenc
Hello, I noticed one more thing. On Fri, Jul 04, 2014 at 07:07:48PM +0200, Rickard Strandqvist wrote: > 2014-07-04 11:10 GMT+02:00 Emil Goode : > > Hello Rickard, > > > > Since this is a probe function there is also no need to release the devm_* > > resources in the i2c_pxa_remove function, this leads to double free. > > > > Also I have a few nit-pick comments below. > > > > On Thu, Jul 03, 2014 at 10:19:16PM +0200, Rickard Strandqvist wrote: > >> Fix for possible null pointer dereferenc, and there is a risk for memory > >> leak if something unexpected happens and the function returns. > >> It now use Managed Device Resource instead. > >> > >> Signed-off-by: Rickard Strandqvist > >> --- > >> drivers/i2c/busses/i2c-pxa.c | 37 - > >> 1 file changed, 16 insertions(+), 21 deletions(-) > >> > >> diff --git a/drivers/i2c/busses/i2c-pxa.c b/drivers/i2c/busses/i2c-pxa.c > >> index be671f7..2edb633 100644 > >> --- a/drivers/i2c/busses/i2c-pxa.c > >> +++ b/drivers/i2c/busses/i2c-pxa.c > >> @@ -1141,10 +1141,10 @@ static int i2c_pxa_probe(struct platform_device > >> *dev) > >> struct resource *res = NULL; > >> int ret, irq; > >> > >> - i2c = kzalloc(sizeof(struct pxa_i2c), GFP_KERNEL); > >> + i2c = devm_kzalloc(>dev, sizeof(struct pxa_i2c), GFP_KERNEL); > >> if (!i2c) { > >> ret = -ENOMEM; > >> - goto emalloc; > >> + goto err_nothing_to_release; > > > > Perhaps its a good idea to return directly here, then the label > > err_nothing_to_release can be removed. > > > >> } > >> > >> /* Default adapter num to device id; i2c_pxa_probe_dt can override. > >> */ > >> @@ -1154,18 +1154,19 @@ static int i2c_pxa_probe(struct platform_device > >> *dev) > >> if (ret > 0) > >> ret = i2c_pxa_probe_pdata(dev, i2c, _type); > >> if (ret < 0) > >> - goto eclk; > >> + goto err_nothing_to_release; > > > > Same here. > > > >> > >> res = platform_get_resource(dev, IORESOURCE_MEM, 0); > >> irq = platform_get_irq(dev, 0); > >> if (res == NULL || irq < 0) { > >> ret = -ENODEV; > >> - goto eclk; > >> + goto err_nothing_to_release; > > > > Same here. > > > >> } > >> > >> - if (!request_mem_region(res->start, resource_size(res), res->name)) { > >> + if (!devm_request_mem_region(>dev, res->start, > >> + resource_size(res), res->name)) { > >> ret = -ENOMEM; > >> - goto eclk; > >> + goto emalloc; > > > > We could also return directly here since the release_mem_region call should > > be removed, as mentioned in Jingoos reply. > > > >> } > >> > >> i2c->adap.owner = THIS_MODULE; > >> @@ -1176,16 +1177,16 @@ static int i2c_pxa_probe(struct platform_device > >> *dev) > >> > >> strlcpy(i2c->adap.name, "pxa_i2c-i2c", sizeof(i2c->adap.name)); > >> > >> - i2c->clk = clk_get(>dev, NULL); > >> + i2c->clk = devm_clk_get(>dev, NULL); > >> if (IS_ERR(i2c->clk)) { > >> ret = PTR_ERR(i2c->clk); > >> - goto eclk; > >> + goto emalloc; > > > > Same here. > > > >> } > >> > >> - i2c->reg_base = ioremap(res->start, resource_size(res)); > >> - if (!i2c->reg_base) { > >> + i2c->reg_base = devm_ioremap_resource(>dev, res)); > >> + if (IS_ERR(i2c->reg_base)) { > >> ret = -EIO; > >> - goto eremap; > >> + goto emalloc; > > > > Same here. > > > >> } > >> > >> i2c->reg_ibmr = i2c->reg_base + pxa_reg_layout[i2c_type].ibmr; > >> @@ -1227,10 +1228,10 @@ static int i2c_pxa_probe(struct platform_device > >> *dev) > >> i2c->adap.algo = _pxa_pio_algorithm; > >> } else { > >> i2c->adap.algo = _pxa_algorithm; > >> - ret = request_irq(irq, i2c_pxa_handler, IRQF_SHARED, > >> - dev_name(>dev), i2c); > >> + ret = devm_request_irq(>dev, irq, i2c_pxa_handler, > >> + IRQF_SHARED, dev_name(>dev), i2c); > >> if (ret) > >> - goto ereqirq; > >> + goto emalloc; > > > > Same here. > > > >> } > >> > >> i2c_pxa_reset(i2c); > >> @@ -1261,15 +1262,9 @@ static int i2c_pxa_probe(struct platform_device > >> *dev) > >> eadapt: > >> if (!i2c->use_pio) > >> free_irq(irq, i2c); > > > > The free_irq() call should also be removed since devm_request_irq() was > > used. > > > >> -ereqirq: > >> - clk_disable_unprepare(i2c->clk); I think we should keep the clk_disable_unprepare() call. > >> - iounmap(i2c->reg_base); > >> -eremap: > >> - clk_put(i2c->clk); > >> -eclk: > >> - kfree(i2c); > >> emalloc: > >> release_mem_region(res->start, resource_size(res)); > >> +err_nothing_to_release: > >> return ret; > >> } > >> > > > > Best regards, >
Re: [PATCH v3] i2c: busses: i2c-pxa.c: Fix for possible null pointer dereferenc
2014-07-04 11:10 GMT+02:00 Emil Goode : > Hello Rickard, > > Since this is a probe function there is also no need to release the devm_* > resources in the i2c_pxa_remove function, this leads to double free. > > Also I have a few nit-pick comments below. > > On Thu, Jul 03, 2014 at 10:19:16PM +0200, Rickard Strandqvist wrote: >> Fix for possible null pointer dereferenc, and there is a risk for memory >> leak if something unexpected happens and the function returns. >> It now use Managed Device Resource instead. >> >> Signed-off-by: Rickard Strandqvist >> --- >> drivers/i2c/busses/i2c-pxa.c | 37 - >> 1 file changed, 16 insertions(+), 21 deletions(-) >> >> diff --git a/drivers/i2c/busses/i2c-pxa.c b/drivers/i2c/busses/i2c-pxa.c >> index be671f7..2edb633 100644 >> --- a/drivers/i2c/busses/i2c-pxa.c >> +++ b/drivers/i2c/busses/i2c-pxa.c >> @@ -1141,10 +1141,10 @@ static int i2c_pxa_probe(struct platform_device *dev) >> struct resource *res = NULL; >> int ret, irq; >> >> - i2c = kzalloc(sizeof(struct pxa_i2c), GFP_KERNEL); >> + i2c = devm_kzalloc(>dev, sizeof(struct pxa_i2c), GFP_KERNEL); >> if (!i2c) { >> ret = -ENOMEM; >> - goto emalloc; >> + goto err_nothing_to_release; > > Perhaps its a good idea to return directly here, then the label > err_nothing_to_release can be removed. > >> } >> >> /* Default adapter num to device id; i2c_pxa_probe_dt can override. */ >> @@ -1154,18 +1154,19 @@ static int i2c_pxa_probe(struct platform_device *dev) >> if (ret > 0) >> ret = i2c_pxa_probe_pdata(dev, i2c, _type); >> if (ret < 0) >> - goto eclk; >> + goto err_nothing_to_release; > > Same here. > >> >> res = platform_get_resource(dev, IORESOURCE_MEM, 0); >> irq = platform_get_irq(dev, 0); >> if (res == NULL || irq < 0) { >> ret = -ENODEV; >> - goto eclk; >> + goto err_nothing_to_release; > > Same here. > >> } >> >> - if (!request_mem_region(res->start, resource_size(res), res->name)) { >> + if (!devm_request_mem_region(>dev, res->start, >> + resource_size(res), res->name)) { >> ret = -ENOMEM; >> - goto eclk; >> + goto emalloc; > > We could also return directly here since the release_mem_region call should > be removed, as mentioned in Jingoos reply. > >> } >> >> i2c->adap.owner = THIS_MODULE; >> @@ -1176,16 +1177,16 @@ static int i2c_pxa_probe(struct platform_device *dev) >> >> strlcpy(i2c->adap.name, "pxa_i2c-i2c", sizeof(i2c->adap.name)); >> >> - i2c->clk = clk_get(>dev, NULL); >> + i2c->clk = devm_clk_get(>dev, NULL); >> if (IS_ERR(i2c->clk)) { >> ret = PTR_ERR(i2c->clk); >> - goto eclk; >> + goto emalloc; > > Same here. > >> } >> >> - i2c->reg_base = ioremap(res->start, resource_size(res)); >> - if (!i2c->reg_base) { >> + i2c->reg_base = devm_ioremap_resource(>dev, res)); >> + if (IS_ERR(i2c->reg_base)) { >> ret = -EIO; >> - goto eremap; >> + goto emalloc; > > Same here. > >> } >> >> i2c->reg_ibmr = i2c->reg_base + pxa_reg_layout[i2c_type].ibmr; >> @@ -1227,10 +1228,10 @@ static int i2c_pxa_probe(struct platform_device *dev) >> i2c->adap.algo = _pxa_pio_algorithm; >> } else { >> i2c->adap.algo = _pxa_algorithm; >> - ret = request_irq(irq, i2c_pxa_handler, IRQF_SHARED, >> - dev_name(>dev), i2c); >> + ret = devm_request_irq(>dev, irq, i2c_pxa_handler, >> + IRQF_SHARED, dev_name(>dev), i2c); >> if (ret) >> - goto ereqirq; >> + goto emalloc; > > Same here. > >> } >> >> i2c_pxa_reset(i2c); >> @@ -1261,15 +1262,9 @@ static int i2c_pxa_probe(struct platform_device *dev) >> eadapt: >> if (!i2c->use_pio) >> free_irq(irq, i2c); > > The free_irq() call should also be removed since devm_request_irq() was used. > >> -ereqirq: >> - clk_disable_unprepare(i2c->clk); >> - iounmap(i2c->reg_base); >> -eremap: >> - clk_put(i2c->clk); >> -eclk: >> - kfree(i2c); >> emalloc: >> release_mem_region(res->start, resource_size(res)); >> +err_nothing_to_release: >> return ret; >> } >> > > Best regards, > > Emil Goode Hi All! Ok, so there is literally nothing to do release anymore. A good system Devres, I understand you want everyone to use it. I also think it is also better to return directly then. But who decides, Wolfram? Would appreciate if I did not have to do more than one patch more. And thanks Jingoo for spelling, etc. Kind regards Rickard Strandqvist -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to
Re: [PATCH v3] i2c: busses: i2c-pxa.c: Fix for possible null pointer dereferenc
Hello Rickard, Since this is a probe function there is also no need to release the devm_* resources in the i2c_pxa_remove function, this leads to double free. Also I have a few nit-pick comments below. On Thu, Jul 03, 2014 at 10:19:16PM +0200, Rickard Strandqvist wrote: > Fix for possible null pointer dereferenc, and there is a risk for memory leak > if something unexpected happens and the function returns. > It now use Managed Device Resource instead. > > Signed-off-by: Rickard Strandqvist > --- > drivers/i2c/busses/i2c-pxa.c | 37 - > 1 file changed, 16 insertions(+), 21 deletions(-) > > diff --git a/drivers/i2c/busses/i2c-pxa.c b/drivers/i2c/busses/i2c-pxa.c > index be671f7..2edb633 100644 > --- a/drivers/i2c/busses/i2c-pxa.c > +++ b/drivers/i2c/busses/i2c-pxa.c > @@ -1141,10 +1141,10 @@ static int i2c_pxa_probe(struct platform_device *dev) > struct resource *res = NULL; > int ret, irq; > > - i2c = kzalloc(sizeof(struct pxa_i2c), GFP_KERNEL); > + i2c = devm_kzalloc(>dev, sizeof(struct pxa_i2c), GFP_KERNEL); > if (!i2c) { > ret = -ENOMEM; > - goto emalloc; > + goto err_nothing_to_release; Perhaps its a good idea to return directly here, then the label err_nothing_to_release can be removed. > } > > /* Default adapter num to device id; i2c_pxa_probe_dt can override. */ > @@ -1154,18 +1154,19 @@ static int i2c_pxa_probe(struct platform_device *dev) > if (ret > 0) > ret = i2c_pxa_probe_pdata(dev, i2c, _type); > if (ret < 0) > - goto eclk; > + goto err_nothing_to_release; Same here. > > res = platform_get_resource(dev, IORESOURCE_MEM, 0); > irq = platform_get_irq(dev, 0); > if (res == NULL || irq < 0) { > ret = -ENODEV; > - goto eclk; > + goto err_nothing_to_release; Same here. > } > > - if (!request_mem_region(res->start, resource_size(res), res->name)) { > + if (!devm_request_mem_region(>dev, res->start, > + resource_size(res), res->name)) { > ret = -ENOMEM; > - goto eclk; > + goto emalloc; We could also return directly here since the release_mem_region call should be removed, as mentioned in Jingoos reply. > } > > i2c->adap.owner = THIS_MODULE; > @@ -1176,16 +1177,16 @@ static int i2c_pxa_probe(struct platform_device *dev) > > strlcpy(i2c->adap.name, "pxa_i2c-i2c", sizeof(i2c->adap.name)); > > - i2c->clk = clk_get(>dev, NULL); > + i2c->clk = devm_clk_get(>dev, NULL); > if (IS_ERR(i2c->clk)) { > ret = PTR_ERR(i2c->clk); > - goto eclk; > + goto emalloc; Same here. > } > > - i2c->reg_base = ioremap(res->start, resource_size(res)); > - if (!i2c->reg_base) { > + i2c->reg_base = devm_ioremap_resource(>dev, res)); > + if (IS_ERR(i2c->reg_base)) { > ret = -EIO; > - goto eremap; > + goto emalloc; Same here. > } > > i2c->reg_ibmr = i2c->reg_base + pxa_reg_layout[i2c_type].ibmr; > @@ -1227,10 +1228,10 @@ static int i2c_pxa_probe(struct platform_device *dev) > i2c->adap.algo = _pxa_pio_algorithm; > } else { > i2c->adap.algo = _pxa_algorithm; > - ret = request_irq(irq, i2c_pxa_handler, IRQF_SHARED, > - dev_name(>dev), i2c); > + ret = devm_request_irq(>dev, irq, i2c_pxa_handler, > + IRQF_SHARED, dev_name(>dev), i2c); > if (ret) > - goto ereqirq; > + goto emalloc; Same here. > } > > i2c_pxa_reset(i2c); > @@ -1261,15 +1262,9 @@ static int i2c_pxa_probe(struct platform_device *dev) > eadapt: > if (!i2c->use_pio) > free_irq(irq, i2c); The free_irq() call should also be removed since devm_request_irq() was used. > -ereqirq: > - clk_disable_unprepare(i2c->clk); > - iounmap(i2c->reg_base); > -eremap: > - clk_put(i2c->clk); > -eclk: > - kfree(i2c); > emalloc: > release_mem_region(res->start, resource_size(res)); > +err_nothing_to_release: > return ret; > } > Best regards, Emil Goode -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: [PATCH v3] i2c: busses: i2c-pxa.c: Fix for possible null pointer dereferenc
Hello Rickard, Since this is a probe function there is also no need to release the devm_* resources in the i2c_pxa_remove function, this leads to double free. Also I have a few nit-pick comments below. On Thu, Jul 03, 2014 at 10:19:16PM +0200, Rickard Strandqvist wrote: Fix for possible null pointer dereferenc, and there is a risk for memory leak if something unexpected happens and the function returns. It now use Managed Device Resource instead. Signed-off-by: Rickard Strandqvist rickard_strandqv...@spectrumdigital.se --- drivers/i2c/busses/i2c-pxa.c | 37 - 1 file changed, 16 insertions(+), 21 deletions(-) diff --git a/drivers/i2c/busses/i2c-pxa.c b/drivers/i2c/busses/i2c-pxa.c index be671f7..2edb633 100644 --- a/drivers/i2c/busses/i2c-pxa.c +++ b/drivers/i2c/busses/i2c-pxa.c @@ -1141,10 +1141,10 @@ static int i2c_pxa_probe(struct platform_device *dev) struct resource *res = NULL; int ret, irq; - i2c = kzalloc(sizeof(struct pxa_i2c), GFP_KERNEL); + i2c = devm_kzalloc(dev-dev, sizeof(struct pxa_i2c), GFP_KERNEL); if (!i2c) { ret = -ENOMEM; - goto emalloc; + goto err_nothing_to_release; Perhaps its a good idea to return directly here, then the label err_nothing_to_release can be removed. } /* Default adapter num to device id; i2c_pxa_probe_dt can override. */ @@ -1154,18 +1154,19 @@ static int i2c_pxa_probe(struct platform_device *dev) if (ret 0) ret = i2c_pxa_probe_pdata(dev, i2c, i2c_type); if (ret 0) - goto eclk; + goto err_nothing_to_release; Same here. res = platform_get_resource(dev, IORESOURCE_MEM, 0); irq = platform_get_irq(dev, 0); if (res == NULL || irq 0) { ret = -ENODEV; - goto eclk; + goto err_nothing_to_release; Same here. } - if (!request_mem_region(res-start, resource_size(res), res-name)) { + if (!devm_request_mem_region(dev-dev, res-start, + resource_size(res), res-name)) { ret = -ENOMEM; - goto eclk; + goto emalloc; We could also return directly here since the release_mem_region call should be removed, as mentioned in Jingoos reply. } i2c-adap.owner = THIS_MODULE; @@ -1176,16 +1177,16 @@ static int i2c_pxa_probe(struct platform_device *dev) strlcpy(i2c-adap.name, pxa_i2c-i2c, sizeof(i2c-adap.name)); - i2c-clk = clk_get(dev-dev, NULL); + i2c-clk = devm_clk_get(dev-dev, NULL); if (IS_ERR(i2c-clk)) { ret = PTR_ERR(i2c-clk); - goto eclk; + goto emalloc; Same here. } - i2c-reg_base = ioremap(res-start, resource_size(res)); - if (!i2c-reg_base) { + i2c-reg_base = devm_ioremap_resource(adev-dev, res)); + if (IS_ERR(i2c-reg_base)) { ret = -EIO; - goto eremap; + goto emalloc; Same here. } i2c-reg_ibmr = i2c-reg_base + pxa_reg_layout[i2c_type].ibmr; @@ -1227,10 +1228,10 @@ static int i2c_pxa_probe(struct platform_device *dev) i2c-adap.algo = i2c_pxa_pio_algorithm; } else { i2c-adap.algo = i2c_pxa_algorithm; - ret = request_irq(irq, i2c_pxa_handler, IRQF_SHARED, - dev_name(dev-dev), i2c); + ret = devm_request_irq(dev-dev, irq, i2c_pxa_handler, + IRQF_SHARED, dev_name(dev-dev), i2c); if (ret) - goto ereqirq; + goto emalloc; Same here. } i2c_pxa_reset(i2c); @@ -1261,15 +1262,9 @@ static int i2c_pxa_probe(struct platform_device *dev) eadapt: if (!i2c-use_pio) free_irq(irq, i2c); The free_irq() call should also be removed since devm_request_irq() was used. -ereqirq: - clk_disable_unprepare(i2c-clk); - iounmap(i2c-reg_base); -eremap: - clk_put(i2c-clk); -eclk: - kfree(i2c); emalloc: release_mem_region(res-start, resource_size(res)); +err_nothing_to_release: return ret; } Best regards, Emil Goode -- To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: [PATCH v3] i2c: busses: i2c-pxa.c: Fix for possible null pointer dereferenc
2014-07-04 11:10 GMT+02:00 Emil Goode emilgo...@gmail.com: Hello Rickard, Since this is a probe function there is also no need to release the devm_* resources in the i2c_pxa_remove function, this leads to double free. Also I have a few nit-pick comments below. On Thu, Jul 03, 2014 at 10:19:16PM +0200, Rickard Strandqvist wrote: Fix for possible null pointer dereferenc, and there is a risk for memory leak if something unexpected happens and the function returns. It now use Managed Device Resource instead. Signed-off-by: Rickard Strandqvist rickard_strandqv...@spectrumdigital.se --- drivers/i2c/busses/i2c-pxa.c | 37 - 1 file changed, 16 insertions(+), 21 deletions(-) diff --git a/drivers/i2c/busses/i2c-pxa.c b/drivers/i2c/busses/i2c-pxa.c index be671f7..2edb633 100644 --- a/drivers/i2c/busses/i2c-pxa.c +++ b/drivers/i2c/busses/i2c-pxa.c @@ -1141,10 +1141,10 @@ static int i2c_pxa_probe(struct platform_device *dev) struct resource *res = NULL; int ret, irq; - i2c = kzalloc(sizeof(struct pxa_i2c), GFP_KERNEL); + i2c = devm_kzalloc(dev-dev, sizeof(struct pxa_i2c), GFP_KERNEL); if (!i2c) { ret = -ENOMEM; - goto emalloc; + goto err_nothing_to_release; Perhaps its a good idea to return directly here, then the label err_nothing_to_release can be removed. } /* Default adapter num to device id; i2c_pxa_probe_dt can override. */ @@ -1154,18 +1154,19 @@ static int i2c_pxa_probe(struct platform_device *dev) if (ret 0) ret = i2c_pxa_probe_pdata(dev, i2c, i2c_type); if (ret 0) - goto eclk; + goto err_nothing_to_release; Same here. res = platform_get_resource(dev, IORESOURCE_MEM, 0); irq = platform_get_irq(dev, 0); if (res == NULL || irq 0) { ret = -ENODEV; - goto eclk; + goto err_nothing_to_release; Same here. } - if (!request_mem_region(res-start, resource_size(res), res-name)) { + if (!devm_request_mem_region(dev-dev, res-start, + resource_size(res), res-name)) { ret = -ENOMEM; - goto eclk; + goto emalloc; We could also return directly here since the release_mem_region call should be removed, as mentioned in Jingoos reply. } i2c-adap.owner = THIS_MODULE; @@ -1176,16 +1177,16 @@ static int i2c_pxa_probe(struct platform_device *dev) strlcpy(i2c-adap.name, pxa_i2c-i2c, sizeof(i2c-adap.name)); - i2c-clk = clk_get(dev-dev, NULL); + i2c-clk = devm_clk_get(dev-dev, NULL); if (IS_ERR(i2c-clk)) { ret = PTR_ERR(i2c-clk); - goto eclk; + goto emalloc; Same here. } - i2c-reg_base = ioremap(res-start, resource_size(res)); - if (!i2c-reg_base) { + i2c-reg_base = devm_ioremap_resource(adev-dev, res)); + if (IS_ERR(i2c-reg_base)) { ret = -EIO; - goto eremap; + goto emalloc; Same here. } i2c-reg_ibmr = i2c-reg_base + pxa_reg_layout[i2c_type].ibmr; @@ -1227,10 +1228,10 @@ static int i2c_pxa_probe(struct platform_device *dev) i2c-adap.algo = i2c_pxa_pio_algorithm; } else { i2c-adap.algo = i2c_pxa_algorithm; - ret = request_irq(irq, i2c_pxa_handler, IRQF_SHARED, - dev_name(dev-dev), i2c); + ret = devm_request_irq(dev-dev, irq, i2c_pxa_handler, + IRQF_SHARED, dev_name(dev-dev), i2c); if (ret) - goto ereqirq; + goto emalloc; Same here. } i2c_pxa_reset(i2c); @@ -1261,15 +1262,9 @@ static int i2c_pxa_probe(struct platform_device *dev) eadapt: if (!i2c-use_pio) free_irq(irq, i2c); The free_irq() call should also be removed since devm_request_irq() was used. -ereqirq: - clk_disable_unprepare(i2c-clk); - iounmap(i2c-reg_base); -eremap: - clk_put(i2c-clk); -eclk: - kfree(i2c); emalloc: release_mem_region(res-start, resource_size(res)); +err_nothing_to_release: return ret; } Best regards, Emil Goode Hi All! Ok, so there is literally nothing to do release anymore. A good system Devres, I understand you want everyone to use it. I also think it is also better to return directly then. But who decides, Wolfram? Would appreciate if I did not have to do more than one patch more. And thanks Jingoo for spelling, etc. Kind regards Rickard Strandqvist -- To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: [PATCH v3] i2c: busses: i2c-pxa.c: Fix for possible null pointer dereferenc
Hello, I noticed one more thing. On Fri, Jul 04, 2014 at 07:07:48PM +0200, Rickard Strandqvist wrote: 2014-07-04 11:10 GMT+02:00 Emil Goode emilgo...@gmail.com: Hello Rickard, Since this is a probe function there is also no need to release the devm_* resources in the i2c_pxa_remove function, this leads to double free. Also I have a few nit-pick comments below. On Thu, Jul 03, 2014 at 10:19:16PM +0200, Rickard Strandqvist wrote: Fix for possible null pointer dereferenc, and there is a risk for memory leak if something unexpected happens and the function returns. It now use Managed Device Resource instead. Signed-off-by: Rickard Strandqvist rickard_strandqv...@spectrumdigital.se --- drivers/i2c/busses/i2c-pxa.c | 37 - 1 file changed, 16 insertions(+), 21 deletions(-) diff --git a/drivers/i2c/busses/i2c-pxa.c b/drivers/i2c/busses/i2c-pxa.c index be671f7..2edb633 100644 --- a/drivers/i2c/busses/i2c-pxa.c +++ b/drivers/i2c/busses/i2c-pxa.c @@ -1141,10 +1141,10 @@ static int i2c_pxa_probe(struct platform_device *dev) struct resource *res = NULL; int ret, irq; - i2c = kzalloc(sizeof(struct pxa_i2c), GFP_KERNEL); + i2c = devm_kzalloc(dev-dev, sizeof(struct pxa_i2c), GFP_KERNEL); if (!i2c) { ret = -ENOMEM; - goto emalloc; + goto err_nothing_to_release; Perhaps its a good idea to return directly here, then the label err_nothing_to_release can be removed. } /* Default adapter num to device id; i2c_pxa_probe_dt can override. */ @@ -1154,18 +1154,19 @@ static int i2c_pxa_probe(struct platform_device *dev) if (ret 0) ret = i2c_pxa_probe_pdata(dev, i2c, i2c_type); if (ret 0) - goto eclk; + goto err_nothing_to_release; Same here. res = platform_get_resource(dev, IORESOURCE_MEM, 0); irq = platform_get_irq(dev, 0); if (res == NULL || irq 0) { ret = -ENODEV; - goto eclk; + goto err_nothing_to_release; Same here. } - if (!request_mem_region(res-start, resource_size(res), res-name)) { + if (!devm_request_mem_region(dev-dev, res-start, + resource_size(res), res-name)) { ret = -ENOMEM; - goto eclk; + goto emalloc; We could also return directly here since the release_mem_region call should be removed, as mentioned in Jingoos reply. } i2c-adap.owner = THIS_MODULE; @@ -1176,16 +1177,16 @@ static int i2c_pxa_probe(struct platform_device *dev) strlcpy(i2c-adap.name, pxa_i2c-i2c, sizeof(i2c-adap.name)); - i2c-clk = clk_get(dev-dev, NULL); + i2c-clk = devm_clk_get(dev-dev, NULL); if (IS_ERR(i2c-clk)) { ret = PTR_ERR(i2c-clk); - goto eclk; + goto emalloc; Same here. } - i2c-reg_base = ioremap(res-start, resource_size(res)); - if (!i2c-reg_base) { + i2c-reg_base = devm_ioremap_resource(adev-dev, res)); + if (IS_ERR(i2c-reg_base)) { ret = -EIO; - goto eremap; + goto emalloc; Same here. } i2c-reg_ibmr = i2c-reg_base + pxa_reg_layout[i2c_type].ibmr; @@ -1227,10 +1228,10 @@ static int i2c_pxa_probe(struct platform_device *dev) i2c-adap.algo = i2c_pxa_pio_algorithm; } else { i2c-adap.algo = i2c_pxa_algorithm; - ret = request_irq(irq, i2c_pxa_handler, IRQF_SHARED, - dev_name(dev-dev), i2c); + ret = devm_request_irq(dev-dev, irq, i2c_pxa_handler, + IRQF_SHARED, dev_name(dev-dev), i2c); if (ret) - goto ereqirq; + goto emalloc; Same here. } i2c_pxa_reset(i2c); @@ -1261,15 +1262,9 @@ static int i2c_pxa_probe(struct platform_device *dev) eadapt: if (!i2c-use_pio) free_irq(irq, i2c); The free_irq() call should also be removed since devm_request_irq() was used. -ereqirq: - clk_disable_unprepare(i2c-clk); I think we should keep the clk_disable_unprepare() call. - iounmap(i2c-reg_base); -eremap: - clk_put(i2c-clk); -eclk: - kfree(i2c); emalloc: release_mem_region(res-start, resource_size(res)); +err_nothing_to_release: return ret; } Best regards, Emil Goode Hi All! Ok, so there is literally nothing to do release anymore. A good system Devres, I understand you want everyone to use it. I also think it is also better to return directly then. But who decides, Wolfram? Yes, Wolfram is the maintainer. Personally I would do the devm_* convertion in a second patch. Best
Re: [PATCH v3] i2c: busses: i2c-pxa.c: Fix for possible null pointer dereferenc
On Friday, July 04, 2014 5:19 AM, Rickard Strandqvist wrote: > > Fix for possible null pointer dereferenc, and there is a risk > for memory leak if something unexpected s/dereferenc/dereference The columns of this commit is too long. Please keep about 80 columns. > happens and the function returns. > It now use Managed Device Resource instead. s/use/uses > > Signed-off-by: Rickard Strandqvist > --- > drivers/i2c/busses/i2c-pxa.c | 37 - > 1 file changed, 16 insertions(+), 21 deletions(-) > > diff --git a/drivers/i2c/busses/i2c-pxa.c b/drivers/i2c/busses/i2c-pxa.c > index be671f7..2edb633 100644 > --- a/drivers/i2c/busses/i2c-pxa.c > +++ b/drivers/i2c/busses/i2c-pxa.c > @@ -1141,10 +1141,10 @@ static int i2c_pxa_probe(struct platform_device *dev) > struct resource *res = NULL; > int ret, irq; > > - i2c = kzalloc(sizeof(struct pxa_i2c), GFP_KERNEL); > + i2c = devm_kzalloc(>dev, sizeof(struct pxa_i2c), GFP_KERNEL); > if (!i2c) { > ret = -ENOMEM; > - goto emalloc; > + goto err_nothing_to_release; > } > > /* Default adapter num to device id; i2c_pxa_probe_dt can override. */ > @@ -1154,18 +1154,19 @@ static int i2c_pxa_probe(struct platform_device *dev) > if (ret > 0) > ret = i2c_pxa_probe_pdata(dev, i2c, _type); > if (ret < 0) > - goto eclk; > + goto err_nothing_to_release; > > res = platform_get_resource(dev, IORESOURCE_MEM, 0); > irq = platform_get_irq(dev, 0); > if (res == NULL || irq < 0) { > ret = -ENODEV; > - goto eclk; > + goto err_nothing_to_release; > } > > - if (!request_mem_region(res->start, resource_size(res), res->name)) { > + if (!devm_request_mem_region(>dev, res->start, > + resource_size(res), res->name)) { > ret = -ENOMEM; > - goto eclk; > + goto emalloc; > } > > i2c->adap.owner = THIS_MODULE; > @@ -1176,16 +1177,16 @@ static int i2c_pxa_probe(struct platform_device *dev) > > strlcpy(i2c->adap.name, "pxa_i2c-i2c", sizeof(i2c->adap.name)); > > - i2c->clk = clk_get(>dev, NULL); > + i2c->clk = devm_clk_get(>dev, NULL); > if (IS_ERR(i2c->clk)) { > ret = PTR_ERR(i2c->clk); > - goto eclk; > + goto emalloc; > } > > - i2c->reg_base = ioremap(res->start, resource_size(res)); > - if (!i2c->reg_base) { > + i2c->reg_base = devm_ioremap_resource(>dev, res)); > + if (IS_ERR(i2c->reg_base)) { > ret = -EIO; > - goto eremap; > + goto emalloc; > } > > i2c->reg_ibmr = i2c->reg_base + pxa_reg_layout[i2c_type].ibmr; > @@ -1227,10 +1228,10 @@ static int i2c_pxa_probe(struct platform_device *dev) > i2c->adap.algo = _pxa_pio_algorithm; > } else { > i2c->adap.algo = _pxa_algorithm; > - ret = request_irq(irq, i2c_pxa_handler, IRQF_SHARED, > - dev_name(>dev), i2c); > + ret = devm_request_irq(>dev, irq, i2c_pxa_handler, > + IRQF_SHARED, dev_name(>dev), i2c); > if (ret) > - goto ereqirq; > + goto emalloc; > } > > i2c_pxa_reset(i2c); > @@ -1261,15 +1262,9 @@ static int i2c_pxa_probe(struct platform_device *dev) > eadapt: > if (!i2c->use_pio) > free_irq(irq, i2c); > -ereqirq: > - clk_disable_unprepare(i2c->clk); > - iounmap(i2c->reg_base); > -eremap: > - clk_put(i2c->clk); > -eclk: > - kfree(i2c); > emalloc: > release_mem_region(res->start, resource_size(res)); This function can be removed, because devm_request_mem_region() is used. So, please remove release_mem_region(). Best regards, Jingoo Han > +err_nothing_to_release: > return ret; > } > > -- > 1.7.10.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: [PATCH v3] i2c: busses: i2c-pxa.c: Fix for possible null pointer dereferenc
On Friday, July 04, 2014 5:19 AM, Rickard Strandqvist wrote: Fix for possible null pointer dereferenc, and there is a risk for memory leak if something unexpected s/dereferenc/dereference The columns of this commit is too long. Please keep about 80 columns. happens and the function returns. It now use Managed Device Resource instead. s/use/uses Signed-off-by: Rickard Strandqvist rickard_strandqv...@spectrumdigital.se --- drivers/i2c/busses/i2c-pxa.c | 37 - 1 file changed, 16 insertions(+), 21 deletions(-) diff --git a/drivers/i2c/busses/i2c-pxa.c b/drivers/i2c/busses/i2c-pxa.c index be671f7..2edb633 100644 --- a/drivers/i2c/busses/i2c-pxa.c +++ b/drivers/i2c/busses/i2c-pxa.c @@ -1141,10 +1141,10 @@ static int i2c_pxa_probe(struct platform_device *dev) struct resource *res = NULL; int ret, irq; - i2c = kzalloc(sizeof(struct pxa_i2c), GFP_KERNEL); + i2c = devm_kzalloc(dev-dev, sizeof(struct pxa_i2c), GFP_KERNEL); if (!i2c) { ret = -ENOMEM; - goto emalloc; + goto err_nothing_to_release; } /* Default adapter num to device id; i2c_pxa_probe_dt can override. */ @@ -1154,18 +1154,19 @@ static int i2c_pxa_probe(struct platform_device *dev) if (ret 0) ret = i2c_pxa_probe_pdata(dev, i2c, i2c_type); if (ret 0) - goto eclk; + goto err_nothing_to_release; res = platform_get_resource(dev, IORESOURCE_MEM, 0); irq = platform_get_irq(dev, 0); if (res == NULL || irq 0) { ret = -ENODEV; - goto eclk; + goto err_nothing_to_release; } - if (!request_mem_region(res-start, resource_size(res), res-name)) { + if (!devm_request_mem_region(dev-dev, res-start, + resource_size(res), res-name)) { ret = -ENOMEM; - goto eclk; + goto emalloc; } i2c-adap.owner = THIS_MODULE; @@ -1176,16 +1177,16 @@ static int i2c_pxa_probe(struct platform_device *dev) strlcpy(i2c-adap.name, pxa_i2c-i2c, sizeof(i2c-adap.name)); - i2c-clk = clk_get(dev-dev, NULL); + i2c-clk = devm_clk_get(dev-dev, NULL); if (IS_ERR(i2c-clk)) { ret = PTR_ERR(i2c-clk); - goto eclk; + goto emalloc; } - i2c-reg_base = ioremap(res-start, resource_size(res)); - if (!i2c-reg_base) { + i2c-reg_base = devm_ioremap_resource(adev-dev, res)); + if (IS_ERR(i2c-reg_base)) { ret = -EIO; - goto eremap; + goto emalloc; } i2c-reg_ibmr = i2c-reg_base + pxa_reg_layout[i2c_type].ibmr; @@ -1227,10 +1228,10 @@ static int i2c_pxa_probe(struct platform_device *dev) i2c-adap.algo = i2c_pxa_pio_algorithm; } else { i2c-adap.algo = i2c_pxa_algorithm; - ret = request_irq(irq, i2c_pxa_handler, IRQF_SHARED, - dev_name(dev-dev), i2c); + ret = devm_request_irq(dev-dev, irq, i2c_pxa_handler, + IRQF_SHARED, dev_name(dev-dev), i2c); if (ret) - goto ereqirq; + goto emalloc; } i2c_pxa_reset(i2c); @@ -1261,15 +1262,9 @@ static int i2c_pxa_probe(struct platform_device *dev) eadapt: if (!i2c-use_pio) free_irq(irq, i2c); -ereqirq: - clk_disable_unprepare(i2c-clk); - iounmap(i2c-reg_base); -eremap: - clk_put(i2c-clk); -eclk: - kfree(i2c); emalloc: release_mem_region(res-start, resource_size(res)); This function can be removed, because devm_request_mem_region() is used. So, please remove release_mem_region(). Best regards, Jingoo Han +err_nothing_to_release: return ret; } -- 1.7.10.4 -- To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/