Re: [PATCH -next] drm/shmob: Fix return value check in shmob_drm_probe

[Simon Horman]

On Mon, Dec 17, 2018 at 05:18:30PM +0800, YueHaibing wrote:
> In case of error, the function devm_ioremap_resource() returns ERR_PTR()
> and never returns NULL. The NULL test in the return value check should
> be replaced with IS_ERR().
> 
> Fixes: 8f1597c8f1a5 ("drm: shmobile: Perform initialization/cleanup at 
> probe/remove time")
> Signed-off-by: YueHaibing 

Reviewed-by: Simon Horman 
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Re: [PATCH -next] drm/shmob: Fix return value check in shmob_drm_probe

[Laurent Pinchart]

Hi Yue,

Thank you for the patch.

On Monday, 17 December 2018 11:18:30 EET YueHaibing wrote:
> In case of error, the function devm_ioremap_resource() returns ERR_PTR()
> and never returns NULL. The NULL test in the return value check should
> be replaced with IS_ERR().
> 
> Fixes: 8f1597c8f1a5 ("drm: shmobile: Perform initialization/cleanup at
> probe/remove time")
> Signed-off-by: YueHaibing 

Reviewed-by: Laurent Pinchart 

and applied to my tree.

> ---
>  drivers/gpu/drm/shmobile/shmob_drm_drv.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/shmobile/shmob_drm_drv.c
> b/drivers/gpu/drm/shmobile/shmob_drm_drv.c index 8554102..f2cfd16 100644
> --- a/drivers/gpu/drm/shmobile/shmob_drm_drv.c
> +++ b/drivers/gpu/drm/shmobile/shmob_drm_drv.c
> @@ -229,8 +229,8 @@ static int shmob_drm_probe(struct platform_device *pdev)
> 
>   res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>   sdev->mmio = devm_ioremap_resource(>dev, res);
> - if (sdev->mmio == NULL)
> - return -ENOMEM;
> + if (IS_ERR(sdev->mmio))
> + return PTR_ERR(sdev->mmio);
> 
>   ret = shmob_drm_setup_clocks(sdev, pdata->clk_source);
>   if (ret < 0)

-- 
Regards,

Laurent Pinchart



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Re: [PATCH -next] drm/shmob: Fix return value check in shmob_drm_probe

[Kieran Bingham]

Hi YeuHaibing,

On 17/12/2018 09:18, YueHaibing wrote:
> In case of error, the function devm_ioremap_resource() returns ERR_PTR()
> and never returns NULL. The NULL test in the return value check should
> be replaced with IS_ERR().
> 

This looks correct to me.

I wonder if this failure pattern occurs a lot in the kernel.

I wonder if we have a cocci-check for this ?
It seems the closest we have is scripts/coccinelle/null/eno.cocci.

Perhaps that could be extended sometime to check these globally.

> Fixes: 8f1597c8f1a5 ("drm: shmobile: Perform initialization/cleanup at 
> probe/remove time")
> Signed-off-by: YueHaibing 

Reviewed-by: Kieran Bingham 

> ---
>  drivers/gpu/drm/shmobile/shmob_drm_drv.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/shmobile/shmob_drm_drv.c 
> b/drivers/gpu/drm/shmobile/shmob_drm_drv.c
> index 8554102..f2cfd16 100644
> --- a/drivers/gpu/drm/shmobile/shmob_drm_drv.c
> +++ b/drivers/gpu/drm/shmobile/shmob_drm_drv.c
> @@ -229,8 +229,8 @@ static int shmob_drm_probe(struct platform_device *pdev)
>  
>   res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>   sdev->mmio = devm_ioremap_resource(>dev, res);
> - if (sdev->mmio == NULL)
> - return -ENOMEM;
> + if (IS_ERR(sdev->mmio))
> + return PTR_ERR(sdev->mmio);
>  
>   ret = shmob_drm_setup_clocks(sdev, pdata->clk_source);
>   if (ret < 0)
> 

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Re: [PATCH -next] drm/shmob: fix return value check in shmob_drm_probe()

[Laurent Pinchart]

Hi Wei,

Thank you for the patch.

On Tuesday 25 Apr 2017 03:08:08 Wei Yongjun wrote:
> From: Wei Yongjun 
> 
> In case of error, the function devm_ioremap_resource() returns ERR_PTR()
> and never returns NULL. The NULL test in the return value check should
> be replaced with IS_ERR().
> 
> Signed-off-by: Wei Yongjun 

Reviewed-by: Laurent Pinchart 

and applied to my tree. I'll send a pull request for v4.13.

> ---
>  drivers/gpu/drm/shmobile/shmob_drm_drv.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/shmobile/shmob_drm_drv.c
> b/drivers/gpu/drm/shmobile/shmob_drm_drv.c index 800d1d2..6bd777a 100644
> --- a/drivers/gpu/drm/shmobile/shmob_drm_drv.c
> +++ b/drivers/gpu/drm/shmobile/shmob_drm_drv.c
> @@ -235,8 +235,8 @@ static int shmob_drm_probe(struct platform_device *pdev)
> 
>   res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>   sdev->mmio = devm_ioremap_resource(>dev, res);
> - if (sdev->mmio == NULL)
> - return -ENOMEM;
> + if (IS_ERR(sdev->mmio))
> + return PTR_ERR(sdev->mmio);
> 
>   ret = shmob_drm_setup_clocks(sdev, pdata->clk_source);
>   if (ret < 0)

-- 
Regards,

Laurent Pinchart

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