Re: [PATCH v2] media: imx7-mipi-csis: Add a check for devm_regulator_get

2019-10-17 Thread Rui Miguel Silva 
Hi Chuhong,
many thanks for the patch.

On Tue 15 Oct 2019 at 14:59, Chuhong Yuan wrote:
> devm_regulator_get may return an error but mipi_csis_phy_init misses
> a check for it.
> This may lead to problems when regulator_set_voltage uses the unchecked
> pointer.
> This patch adds a check for devm_regulator_get to avoid potential risk.
>
> Signed-off-by: Chuhong Yuan 

Reviewed-by: Rui Miguel Silva 

---
Cheers,
Rui

> ---
> Changes in v2:
>   - Add a check in mipi_csis_probe for the modified mipi_csis_phy_init.
>
>  drivers/staging/media/imx/imx7-mipi-csis.c | 8 +++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/staging/media/imx/imx7-mipi-csis.c 
> b/drivers/staging/media/imx/imx7-mipi-csis.c
> index 73d8354e618c..e8a6acaa969e 100644
> --- a/drivers/staging/media/imx/imx7-mipi-csis.c
> +++ b/drivers/staging/media/imx/imx7-mipi-csis.c
> @@ -350,6 +350,8 @@ static void mipi_csis_sw_reset(struct csi_state *state)
>  static int mipi_csis_phy_init(struct csi_state *state)
>  {
>   state->mipi_phy_regulator = devm_regulator_get(state->dev, "phy");
> + if (IS_ERR(state->mipi_phy_regulator))
> + return PTR_ERR(state->mipi_phy_regulator);
>
>   return regulator_set_voltage(state->mipi_phy_regulator, 100,
>100);
> @@ -966,7 +968,10 @@ static int mipi_csis_probe(struct platform_device *pdev)
>   return ret;
>   }
>
> - mipi_csis_phy_init(state);
> + ret = mipi_csis_phy_init(state);
> + if (ret < 0)
> + return ret;
> +
>   mipi_csis_phy_reset(state);
>
>   mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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Re: [PATCH v2] media: imx7-mipi-csis: Add a check for devm_regulator_get

2019-10-17 Thread Rui Miguel Silva 
Hi Marco,
On Thu 17 Oct 2019 at 09:10, Marco Felsch wrote:
> Hi Rui,
>
> On 19-10-16 14:43, Rui Miguel Silva wrote:
>> Hi Marco,
>> On Wed 16 Oct 2019 at 10:06, Marco Felsch wrote:
>> > Hi Chuhong,
>> >
>> > On 19-10-15 21:59, Chuhong Yuan wrote:
>> >> devm_regulator_get may return an error but mipi_csis_phy_init misses
>> >> a check for it.
>> >> This may lead to problems when regulator_set_voltage uses the unchecked
>> >> pointer.
>> >> This patch adds a check for devm_regulator_get to avoid potential risk.
>> >>
>> >> Signed-off-by: Chuhong Yuan 
>> >> ---
>> >> Changes in v2:
>> >>   - Add a check in mipi_csis_probe for the modified mipi_csis_phy_init.
>> >
>> > Did you miss the check for -EPROBE_DEFER?
>> >
>>
>> I think nothing special is really needed to do in case of
>> EPROBE_DEFER, or am I missing something?
>> It just return to probe and probe returns also. I just talked
>> about it because it was not cover in the original code.
>
> Yes, your are right... I shouldn't comment on anything I read with one
> eye. Sorry.
>

ehehe, no problem and thanks for your inputs.

---
Cheers,
Rui

>
> Regards,
>   Marco
>
>> ---
>> Cheers,
>>  Rui
>>
>> >
>> > Regards,
>> >   Marco
>> >
>> >>
>> >>  drivers/staging/media/imx/imx7-mipi-csis.c | 8 +++-
>> >>  1 file changed, 7 insertions(+), 1 deletion(-)
>> >>
>> >> diff --git a/drivers/staging/media/imx/imx7-mipi-csis.c 
>> >> b/drivers/staging/media/imx/imx7-mipi-csis.c
>> >> index 73d8354e618c..e8a6acaa969e 100644
>> >> --- a/drivers/staging/media/imx/imx7-mipi-csis.c
>> >> +++ b/drivers/staging/media/imx/imx7-mipi-csis.c
>> >> @@ -350,6 +350,8 @@ static void mipi_csis_sw_reset(struct csi_state 
>> >> *state)
>> >>  static int mipi_csis_phy_init(struct csi_state *state)
>> >>  {
>> >>   state->mipi_phy_regulator = devm_regulator_get(state->dev, "phy");
>> >> + if (IS_ERR(state->mipi_phy_regulator))
>> >> + return PTR_ERR(state->mipi_phy_regulator);
>> >>
>> >>   return regulator_set_voltage(state->mipi_phy_regulator, 100,
>> >>100);
>> >> @@ -966,7 +968,10 @@ static int mipi_csis_probe(struct platform_device 
>> >> *pdev)
>> >>   return ret;
>> >>   }
>> >>
>> >> - mipi_csis_phy_init(state);
>> >> + ret = mipi_csis_phy_init(state);
>> >> + if (ret < 0)
>> >> + return ret;
>> >> +
>> >>   mipi_csis_phy_reset(state);
>> >>
>> >>   mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> >> --
>> >> 2.20.1
>> >>
>> >>
>> >>
>>
>>

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Re: [PATCH v2] media: imx7-mipi-csis: Add a check for devm_regulator_get

2019-10-17 Thread Marco Felsch 
Hi Rui,

On 19-10-16 14:43, Rui Miguel Silva wrote:
> Hi Marco,
> On Wed 16 Oct 2019 at 10:06, Marco Felsch wrote:
> > Hi Chuhong,
> >
> > On 19-10-15 21:59, Chuhong Yuan wrote:
> >> devm_regulator_get may return an error but mipi_csis_phy_init misses
> >> a check for it.
> >> This may lead to problems when regulator_set_voltage uses the unchecked
> >> pointer.
> >> This patch adds a check for devm_regulator_get to avoid potential risk.
> >>
> >> Signed-off-by: Chuhong Yuan 
> >> ---
> >> Changes in v2:
> >>   - Add a check in mipi_csis_probe for the modified mipi_csis_phy_init.
> >
> > Did you miss the check for -EPROBE_DEFER?
> >
> 
> I think nothing special is really needed to do in case of
> EPROBE_DEFER, or am I missing something?
> It just return to probe and probe returns also. I just talked
> about it because it was not cover in the original code.

Yes, your are right... I shouldn't comment on anything I read with one
eye. Sorry.

Regards,
  Marco

> ---
> Cheers,
>   Rui
> 
> >
> > Regards,
> >   Marco
> >
> >>
> >>  drivers/staging/media/imx/imx7-mipi-csis.c | 8 +++-
> >>  1 file changed, 7 insertions(+), 1 deletion(-)
> >>
> >> diff --git a/drivers/staging/media/imx/imx7-mipi-csis.c 
> >> b/drivers/staging/media/imx/imx7-mipi-csis.c
> >> index 73d8354e618c..e8a6acaa969e 100644
> >> --- a/drivers/staging/media/imx/imx7-mipi-csis.c
> >> +++ b/drivers/staging/media/imx/imx7-mipi-csis.c
> >> @@ -350,6 +350,8 @@ static void mipi_csis_sw_reset(struct csi_state *state)
> >>  static int mipi_csis_phy_init(struct csi_state *state)
> >>  {
> >>state->mipi_phy_regulator = devm_regulator_get(state->dev, "phy");
> >> +  if (IS_ERR(state->mipi_phy_regulator))
> >> +  return PTR_ERR(state->mipi_phy_regulator);
> >>
> >>return regulator_set_voltage(state->mipi_phy_regulator, 100,
> >> 100);
> >> @@ -966,7 +968,10 @@ static int mipi_csis_probe(struct platform_device 
> >> *pdev)
> >>return ret;
> >>}
> >>
> >> -  mipi_csis_phy_init(state);
> >> +  ret = mipi_csis_phy_init(state);
> >> +  if (ret < 0)
> >> +  return ret;
> >> +
> >>mipi_csis_phy_reset(state);
> >>
> >>mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> >> --
> >> 2.20.1
> >>
> >>
> >>
> 
> 

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Re: [PATCH v2] media: imx7-mipi-csis: Add a check for devm_regulator_get

2019-10-16 Thread Rui Miguel Silva 
Hi Marco,
On Wed 16 Oct 2019 at 10:06, Marco Felsch wrote:
> Hi Chuhong,
>
> On 19-10-15 21:59, Chuhong Yuan wrote:
>> devm_regulator_get may return an error but mipi_csis_phy_init misses
>> a check for it.
>> This may lead to problems when regulator_set_voltage uses the unchecked
>> pointer.
>> This patch adds a check for devm_regulator_get to avoid potential risk.
>>
>> Signed-off-by: Chuhong Yuan 
>> ---
>> Changes in v2:
>>   - Add a check in mipi_csis_probe for the modified mipi_csis_phy_init.
>
> Did you miss the check for -EPROBE_DEFER?
>

I think nothing special is really needed to do in case of
EPROBE_DEFER, or am I missing something?
It just return to probe and probe returns also. I just talked
about it because it was not cover in the original code.

---
Cheers,
Rui

>
> Regards,
>   Marco
>
>>
>>  drivers/staging/media/imx/imx7-mipi-csis.c | 8 +++-
>>  1 file changed, 7 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/staging/media/imx/imx7-mipi-csis.c 
>> b/drivers/staging/media/imx/imx7-mipi-csis.c
>> index 73d8354e618c..e8a6acaa969e 100644
>> --- a/drivers/staging/media/imx/imx7-mipi-csis.c
>> +++ b/drivers/staging/media/imx/imx7-mipi-csis.c
>> @@ -350,6 +350,8 @@ static void mipi_csis_sw_reset(struct csi_state *state)
>>  static int mipi_csis_phy_init(struct csi_state *state)
>>  {
>>  state->mipi_phy_regulator = devm_regulator_get(state->dev, "phy");
>> +if (IS_ERR(state->mipi_phy_regulator))
>> +return PTR_ERR(state->mipi_phy_regulator);
>>
>>  return regulator_set_voltage(state->mipi_phy_regulator, 100,
>>   100);
>> @@ -966,7 +968,10 @@ static int mipi_csis_probe(struct platform_device *pdev)
>>  return ret;
>>  }
>>
>> -mipi_csis_phy_init(state);
>> +ret = mipi_csis_phy_init(state);
>> +if (ret < 0)
>> +return ret;
>> +
>>  mipi_csis_phy_reset(state);
>>
>>  mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> --
>> 2.20.1
>>
>>
>>

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Re: [PATCH v2] media: imx7-mipi-csis: Add a check for devm_regulator_get

2019-10-16 Thread Marco Felsch 
Hi Chuhong,

On 19-10-15 21:59, Chuhong Yuan wrote:
> devm_regulator_get may return an error but mipi_csis_phy_init misses
> a check for it.
> This may lead to problems when regulator_set_voltage uses the unchecked
> pointer.
> This patch adds a check for devm_regulator_get to avoid potential risk.
> 
> Signed-off-by: Chuhong Yuan 
> ---
> Changes in v2:
>   - Add a check in mipi_csis_probe for the modified mipi_csis_phy_init.

Did you miss the check for -EPROBE_DEFER?

Regards,
  Marco

> 
>  drivers/staging/media/imx/imx7-mipi-csis.c | 8 +++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/staging/media/imx/imx7-mipi-csis.c 
> b/drivers/staging/media/imx/imx7-mipi-csis.c
> index 73d8354e618c..e8a6acaa969e 100644
> --- a/drivers/staging/media/imx/imx7-mipi-csis.c
> +++ b/drivers/staging/media/imx/imx7-mipi-csis.c
> @@ -350,6 +350,8 @@ static void mipi_csis_sw_reset(struct csi_state *state)
>  static int mipi_csis_phy_init(struct csi_state *state)
>  {
>   state->mipi_phy_regulator = devm_regulator_get(state->dev, "phy");
> + if (IS_ERR(state->mipi_phy_regulator))
> + return PTR_ERR(state->mipi_phy_regulator);
>  
>   return regulator_set_voltage(state->mipi_phy_regulator, 100,
>100);
> @@ -966,7 +968,10 @@ static int mipi_csis_probe(struct platform_device *pdev)
>   return ret;
>   }
>  
> - mipi_csis_phy_init(state);
> + ret = mipi_csis_phy_init(state);
> + if (ret < 0)
> + return ret;
> +
>   mipi_csis_phy_reset(state);
>  
>   mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> -- 
> 2.20.1
> 
> 
> 

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[PATCH v2] media: imx7-mipi-csis: Add a check for devm_regulator_get

2019-10-15 Thread Chuhong Yuan 
devm_regulator_get may return an error but mipi_csis_phy_init misses
a check for it.
This may lead to problems when regulator_set_voltage uses the unchecked
pointer.
This patch adds a check for devm_regulator_get to avoid potential risk.

Signed-off-by: Chuhong Yuan 
---
Changes in v2:
  - Add a check in mipi_csis_probe for the modified mipi_csis_phy_init.

 drivers/staging/media/imx/imx7-mipi-csis.c | 8 +++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/media/imx/imx7-mipi-csis.c 
b/drivers/staging/media/imx/imx7-mipi-csis.c
index 73d8354e618c..e8a6acaa969e 100644
--- a/drivers/staging/media/imx/imx7-mipi-csis.c
+++ b/drivers/staging/media/imx/imx7-mipi-csis.c
@@ -350,6 +350,8 @@ static void mipi_csis_sw_reset(struct csi_state *state)
 static int mipi_csis_phy_init(struct csi_state *state)
 {
state->mipi_phy_regulator = devm_regulator_get(state->dev, "phy");
+   if (IS_ERR(state->mipi_phy_regulator))
+   return PTR_ERR(state->mipi_phy_regulator);
 
return regulator_set_voltage(state->mipi_phy_regulator, 100,
 100);
@@ -966,7 +968,10 @@ static int mipi_csis_probe(struct platform_device *pdev)
return ret;
}
 
-   mipi_csis_phy_init(state);
+   ret = mipi_csis_phy_init(state);
+   if (ret < 0)
+   return ret;
+
mipi_csis_phy_reset(state);
 
mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-- 
2.20.1

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