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* [PATCH v2] media: imx7-mipi-csis: Add a check for devm_regulator_get
@ 2019-10-15 13:59 ` Chuhong Yuan
  0 siblings, 0 replies; 18+ messages in thread
From: Chuhong Yuan @ 2019-10-15 13:59 UTC (permalink / raw)
  Cc: Rui Miguel Silva, Steve Longerbeam, Philipp Zabel,
	Mauro Carvalho Chehab, Greg Kroah-Hartman, Shawn Guo,
	Sascha Hauer, Pengutronix Kernel Team, Fabio Estevam,
	NXP Linux Team, linux-media, devel, linux-arm-kernel,
	linux-kernel, 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 <hslester96@gmail.com>
---
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, 1000000,
 				     1000000);
@@ -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


^ permalink raw reply related	[flat|nested] 18+ messages in thread
* [PATCH v2] media: imx7-mipi-csis: Add a check for devm_regulator_get
@ 2019-10-15 13:59 ` Chuhong Yuan
  0 siblings, 0 replies; 18+ messages in thread
From: Chuhong Yuan @ 2019-10-15 13:59 UTC (permalink / raw)
  Cc: devel, Pengutronix Kernel Team, Greg Kroah-Hartman, Sascha Hauer,
	Chuhong Yuan, linux-kernel, NXP Linux Team, Philipp Zabel,
	Steve Longerbeam, Mauro Carvalho Chehab, Shawn Guo,
	linux-arm-kernel, linux-media

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 <hslester96@gmail.com>
---
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, 1000000,
 				     1000000);
@@ -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

_______________________________________________
devel mailing list
devel@linuxdriverproject.org
http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel

^ permalink raw reply related	[flat|nested] 18+ messages in thread
* [PATCH v2] media: imx7-mipi-csis: Add a check for devm_regulator_get
@ 2019-10-15 13:59 ` Chuhong Yuan
  0 siblings, 0 replies; 18+ messages in thread
From: Chuhong Yuan @ 2019-10-15 13:59 UTC (permalink / raw)
  Cc: devel, Fabio Estevam, Pengutronix Kernel Team,
	Greg Kroah-Hartman, Sascha Hauer, Chuhong Yuan, linux-kernel,
	Rui Miguel Silva, NXP Linux Team, Philipp Zabel,
	Steve Longerbeam, Mauro Carvalho Chehab, Shawn Guo,
	linux-arm-kernel, linux-media

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 <hslester96@gmail.com>
---
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, 1000000,
 				     1000000);
@@ -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


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

^ permalink raw reply related	[flat|nested] 18+ messages in thread
* Re: [PATCH v2] media: imx7-mipi-csis: Add a check for devm_regulator_get
  2019-10-15 13:59 ` Chuhong Yuan
  (?)
@ 2019-10-16  9:06   ` Marco Felsch
  -1 siblings, 0 replies; 18+ messages in thread
From: Marco Felsch @ 2019-10-16  9:06 UTC (permalink / raw)
  To: Chuhong Yuan
  Cc: devel, Fabio Estevam, Pengutronix Kernel Team,
	Greg Kroah-Hartman, Sascha Hauer, linux-kernel, Rui Miguel Silva,
	NXP Linux Team, Philipp Zabel, Steve Longerbeam,
	Mauro Carvalho Chehab, Shawn Guo, linux-arm-kernel, linux-media

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 <hslester96@gmail.com>
> ---
> 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, 1000000,
>  				     1000000);
> @@ -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
> 
> 
> 

-- 
Pengutronix e.K.                           |                             |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |

^ permalink raw reply	[flat|nested] 18+ messages in thread
* Re: [PATCH v2] media: imx7-mipi-csis: Add a check for devm_regulator_get
@ 2019-10-16  9:06   ` Marco Felsch
  0 siblings, 0 replies; 18+ messages in thread
From: Marco Felsch @ 2019-10-16  9:06 UTC (permalink / raw)
  To: Chuhong Yuan
  Cc: devel, Philipp Zabel, Greg Kroah-Hartman, Sascha Hauer,
	linux-kernel, NXP Linux Team, Pengutronix Kernel Team,
	Steve Longerbeam, Shawn Guo, Mauro Carvalho Chehab,
	linux-arm-kernel, linux-media

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 <hslester96@gmail.com>
> ---
> 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, 1000000,
>  				     1000000);
> @@ -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
> 
> 
> 

-- 
Pengutronix e.K.                           |                             |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |
_______________________________________________
devel mailing list
devel@linuxdriverproject.org
http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel

^ permalink raw reply	[flat|nested] 18+ messages in thread
* Re: [PATCH v2] media: imx7-mipi-csis: Add a check for devm_regulator_get
@ 2019-10-16  9:06   ` Marco Felsch
  0 siblings, 0 replies; 18+ messages in thread
From: Marco Felsch @ 2019-10-16  9:06 UTC (permalink / raw)
  To: Chuhong Yuan
  Cc: devel, Philipp Zabel, Greg Kroah-Hartman, Sascha Hauer,
	linux-kernel, Rui Miguel Silva, NXP Linux Team,
	Pengutronix Kernel Team, Steve Longerbeam, Shawn Guo,
	Mauro Carvalho Chehab, Fabio Estevam, linux-arm-kernel,
	linux-media

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 <hslester96@gmail.com>
> ---
> 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, 1000000,
>  				     1000000);
> @@ -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
> 
> 
> 

-- 
Pengutronix e.K.                           |                             |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

^ permalink raw reply	[flat|nested] 18+ messages in thread
* Re: [PATCH v2] media: imx7-mipi-csis: Add a check for devm_regulator_get
  2019-10-16  9:06   ` Marco Felsch
  (?)
@ 2019-10-16 13:43     ` Rui Miguel Silva
  -1 siblings, 0 replies; 18+ messages in thread
From: Rui Miguel Silva @ 2019-10-16 13:43 UTC (permalink / raw)
  To: Marco Felsch
  Cc: Chuhong Yuan, devel, Fabio Estevam, Pengutronix Kernel Team,
	Greg Kroah-Hartman, Sascha Hauer, linux-kernel, NXP Linux Team,
	Philipp Zabel, Steve Longerbeam, Mauro Carvalho Chehab,
	Shawn Guo, linux-arm-kernel, linux-media

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 <hslester96@gmail.com>
>> ---
>> 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, 1000000,
>>  				     1000000);
>> @@ -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
>>
>>
>>


^ permalink raw reply	[flat|nested] 18+ messages in thread
* Re: [PATCH v2] media: imx7-mipi-csis: Add a check for devm_regulator_get
@ 2019-10-16 13:43     ` Rui Miguel Silva
  0 siblings, 0 replies; 18+ messages in thread
From: Rui Miguel Silva @ 2019-10-16 13:43 UTC (permalink / raw)
  To: Marco Felsch
  Cc: devel, Philipp Zabel, Greg Kroah-Hartman, Sascha Hauer,
	Chuhong Yuan, linux-kernel, NXP Linux Team,
	Pengutronix Kernel Team, Steve Longerbeam, Shawn Guo,
	Mauro Carvalho Chehab, linux-arm-kernel, linux-media

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 <hslester96@gmail.com>
>> ---
>> 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, 1000000,
>>  				     1000000);
>> @@ -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
>>
>>
>>

_______________________________________________
devel mailing list
devel@linuxdriverproject.org
http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel

^ permalink raw reply	[flat|nested] 18+ messages in thread
* Re: [PATCH v2] media: imx7-mipi-csis: Add a check for devm_regulator_get
@ 2019-10-16 13:43     ` Rui Miguel Silva
  0 siblings, 0 replies; 18+ messages in thread
From: Rui Miguel Silva @ 2019-10-16 13:43 UTC (permalink / raw)
  To: Marco Felsch
  Cc: devel, Philipp Zabel, Greg Kroah-Hartman, Sascha Hauer,
	Chuhong Yuan, linux-kernel, NXP Linux Team,
	Pengutronix Kernel Team, Steve Longerbeam, Shawn Guo,
	Mauro Carvalho Chehab, Fabio Estevam, linux-arm-kernel,
	linux-media

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 <hslester96@gmail.com>
>> ---
>> 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, 1000000,
>>  				     1000000);
>> @@ -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
>>
>>
>>


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

^ permalink raw reply	[flat|nested] 18+ messages in thread
* Re: [PATCH v2] media: imx7-mipi-csis: Add a check for devm_regulator_get
  2019-10-16 13:43     ` Rui Miguel Silva
  (?)
@ 2019-10-17  8:10       ` Marco Felsch
  -1 siblings, 0 replies; 18+ messages in thread
From: Marco Felsch @ 2019-10-17  8:10 UTC (permalink / raw)
  To: Rui Miguel Silva
  Cc: Chuhong Yuan, devel, Fabio Estevam, Pengutronix Kernel Team,
	Greg Kroah-Hartman, Sascha Hauer, linux-kernel, NXP Linux Team,
	Philipp Zabel, Steve Longerbeam, Mauro Carvalho Chehab,
	Shawn Guo, linux-arm-kernel, linux-media

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 <hslester96@gmail.com>
> >> ---
> >> 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, 1000000,
> >>  				     1000000);
> >> @@ -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
> >>
> >>
> >>
> 
> 

-- 
Pengutronix e.K.                           |                             |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |

^ permalink raw reply	[flat|nested] 18+ messages in thread
* Re: [PATCH v2] media: imx7-mipi-csis: Add a check for devm_regulator_get
@ 2019-10-17  8:10       ` Marco Felsch
  0 siblings, 0 replies; 18+ messages in thread
From: Marco Felsch @ 2019-10-17  8:10 UTC (permalink / raw)
  To: Rui Miguel Silva
  Cc: devel, Philipp Zabel, Greg Kroah-Hartman, Sascha Hauer,
	Chuhong Yuan, linux-kernel, NXP Linux Team,
	Pengutronix Kernel Team, Steve Longerbeam, Shawn Guo,
	Mauro Carvalho Chehab, linux-arm-kernel, linux-media

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 <hslester96@gmail.com>
> >> ---
> >> 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, 1000000,
> >>  				     1000000);
> >> @@ -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
> >>
> >>
> >>
> 
> 

-- 
Pengutronix e.K.                           |                             |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |
_______________________________________________
devel mailing list
devel@linuxdriverproject.org
http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel

^ permalink raw reply	[flat|nested] 18+ messages in thread
* Re: [PATCH v2] media: imx7-mipi-csis: Add a check for devm_regulator_get
@ 2019-10-17  8:10       ` Marco Felsch
  0 siblings, 0 replies; 18+ messages in thread
From: Marco Felsch @ 2019-10-17  8:10 UTC (permalink / raw)
  To: Rui Miguel Silva
  Cc: devel, Philipp Zabel, Greg Kroah-Hartman, Sascha Hauer,
	Chuhong Yuan, linux-kernel, NXP Linux Team,
	Pengutronix Kernel Team, Steve Longerbeam, Shawn Guo,
	Mauro Carvalho Chehab, Fabio Estevam, linux-arm-kernel,
	linux-media

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 <hslester96@gmail.com>
> >> ---
> >> 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, 1000000,
> >>  				     1000000);
> >> @@ -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
> >>
> >>
> >>
> 
> 

-- 
Pengutronix e.K.                           |                             |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

^ permalink raw reply	[flat|nested] 18+ messages in thread
* Re: [PATCH v2] media: imx7-mipi-csis: Add a check for devm_regulator_get
  2019-10-17  8:10       ` Marco Felsch
  (?)
@ 2019-10-17  9:43         ` Rui Miguel Silva
  -1 siblings, 0 replies; 18+ messages in thread
From: Rui Miguel Silva @ 2019-10-17  9:43 UTC (permalink / raw)
  To: Marco Felsch
  Cc: Chuhong Yuan, devel, Fabio Estevam, Pengutronix Kernel Team,
	Greg Kroah-Hartman, Sascha Hauer, linux-kernel, NXP Linux Team,
	Philipp Zabel, Steve Longerbeam, Mauro Carvalho Chehab,
	Shawn Guo, linux-arm-kernel, linux-media

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 <hslester96@gmail.com>
>> >> ---
>> >> 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, 1000000,
>> >>  				     1000000);
>> >> @@ -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
>> >>
>> >>
>> >>
>>
>>


^ permalink raw reply	[flat|nested] 18+ messages in thread
* Re: [PATCH v2] media: imx7-mipi-csis: Add a check for devm_regulator_get
@ 2019-10-17  9:43         ` Rui Miguel Silva
  0 siblings, 0 replies; 18+ messages in thread
From: Rui Miguel Silva @ 2019-10-17  9:43 UTC (permalink / raw)
  To: Marco Felsch
  Cc: devel, Philipp Zabel, Greg Kroah-Hartman, Sascha Hauer,
	Chuhong Yuan, linux-kernel, NXP Linux Team,
	Pengutronix Kernel Team, Steve Longerbeam, Shawn Guo,
	Mauro Carvalho Chehab, linux-arm-kernel, linux-media

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 <hslester96@gmail.com>
>> >> ---
>> >> 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, 1000000,
>> >>  				     1000000);
>> >> @@ -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
>> >>
>> >>
>> >>
>>
>>

_______________________________________________
devel mailing list
devel@linuxdriverproject.org
http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel

^ permalink raw reply	[flat|nested] 18+ messages in thread
* Re: [PATCH v2] media: imx7-mipi-csis: Add a check for devm_regulator_get
@ 2019-10-17  9:43         ` Rui Miguel Silva
  0 siblings, 0 replies; 18+ messages in thread
From: Rui Miguel Silva @ 2019-10-17  9:43 UTC (permalink / raw)
  To: Marco Felsch
  Cc: devel, Philipp Zabel, Greg Kroah-Hartman, Sascha Hauer,
	Chuhong Yuan, linux-kernel, NXP Linux Team,
	Pengutronix Kernel Team, Steve Longerbeam, Shawn Guo,
	Mauro Carvalho Chehab, Fabio Estevam, linux-arm-kernel,
	linux-media

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 <hslester96@gmail.com>
>> >> ---
>> >> 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, 1000000,
>> >>  				     1000000);
>> >> @@ -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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^ permalink raw reply	[flat|nested] 18+ messages in thread
* Re: [PATCH v2] media: imx7-mipi-csis: Add a check for devm_regulator_get
  2019-10-15 13:59 ` Chuhong Yuan
  (?)
@ 2019-10-17  9:46   ` Rui Miguel Silva
  -1 siblings, 0 replies; 18+ messages in thread
From: Rui Miguel Silva @ 2019-10-17  9:46 UTC (permalink / raw)
  To: Chuhong Yuan
  Cc: Steve Longerbeam, Philipp Zabel, Mauro Carvalho Chehab,
	Greg Kroah-Hartman, Shawn Guo, Sascha Hauer,
	Pengutronix Kernel Team, Fabio Estevam, NXP Linux Team,
	linux-media, devel, linux-arm-kernel, linux-kernel

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 <hslester96@gmail.com>

Reviewed-by: Rui Miguel Silva <rmfrfs@gmail.com>

---
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, 1000000,
>  				     1000000);
> @@ -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);

^ permalink raw reply	[flat|nested] 18+ messages in thread
* Re: [PATCH v2] media: imx7-mipi-csis: Add a check for devm_regulator_get
@ 2019-10-17  9:46   ` Rui Miguel Silva
  0 siblings, 0 replies; 18+ messages in thread
From: Rui Miguel Silva @ 2019-10-17  9:46 UTC (permalink / raw)
  To: Chuhong Yuan
  Cc: devel, Pengutronix Kernel Team, Greg Kroah-Hartman, Sascha Hauer,
	linux-kernel, NXP Linux Team, Philipp Zabel, Steve Longerbeam,
	Mauro Carvalho Chehab, Shawn Guo, linux-arm-kernel, linux-media

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 <hslester96@gmail.com>

Reviewed-by: Rui Miguel Silva <rmfrfs@gmail.com>

---
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, 1000000,
>  				     1000000);
> @@ -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);
_______________________________________________
devel mailing list
devel@linuxdriverproject.org
http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel

^ permalink raw reply	[flat|nested] 18+ messages in thread
* Re: [PATCH v2] media: imx7-mipi-csis: Add a check for devm_regulator_get
@ 2019-10-17  9:46   ` Rui Miguel Silva
  0 siblings, 0 replies; 18+ messages in thread
From: Rui Miguel Silva @ 2019-10-17  9:46 UTC (permalink / raw)
  To: Chuhong Yuan
  Cc: devel, Fabio Estevam, Pengutronix Kernel Team,
	Greg Kroah-Hartman, Sascha Hauer, linux-kernel, NXP Linux Team,
	Philipp Zabel, Steve Longerbeam, Mauro Carvalho Chehab,
	Shawn Guo, linux-arm-kernel, linux-media

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 <hslester96@gmail.com>

Reviewed-by: Rui Miguel Silva <rmfrfs@gmail.com>

---
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, 1000000,
>  				     1000000);
> @@ -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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linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

^ permalink raw reply	[flat|nested] 18+ messages in thread
end of thread, other threads:[~2019-10-17  9:46 UTC | newest]

Thread overview: 18+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2019-10-15 13:59 [PATCH v2] media: imx7-mipi-csis: Add a check for devm_regulator_get Chuhong Yuan
2019-10-15 13:59 ` Chuhong Yuan
2019-10-15 13:59 ` Chuhong Yuan
2019-10-16  9:06 ` Marco Felsch
2019-10-16  9:06   ` Marco Felsch
2019-10-16  9:06   ` Marco Felsch
2019-10-16 13:43   ` Rui Miguel Silva
2019-10-16 13:43     ` Rui Miguel Silva
2019-10-16 13:43     ` Rui Miguel Silva
2019-10-17  8:10     ` Marco Felsch
2019-10-17  8:10       ` Marco Felsch
2019-10-17  8:10       ` Marco Felsch
2019-10-17  9:43       ` Rui Miguel Silva
2019-10-17  9:43         ` Rui Miguel Silva
2019-10-17  9:43         ` Rui Miguel Silva
2019-10-17  9:46 ` Rui Miguel Silva
2019-10-17  9:46   ` Rui Miguel Silva
2019-10-17  9:46   ` Rui Miguel Silva

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