[patch] regulator: max77802: precedence error in max77802_set_suspend_mode()

[patch] regulator: max77802: precedence error in max77802_set_suspend_mode()

[Dan Carpenter]

The "!" operation has higher precedence that the comparison.

Fixes: 2e0eaa1aa008 ('regulator: max77802: Add set suspend mode for BUCKs and simplify code')
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>

diff --git a/drivers/regulator/max77802.c b/drivers/regulator/max77802.c
index 5839c45..57e37fd 100644
--- a/drivers/regulator/max77802.c
+++ b/drivers/regulator/max77802.c
@@ -179,7 +179,7 @@ static int max77802_set_suspend_mode(struct regulator_dev *rdev,
 	 * If the regulator has been disabled for suspend
 	 * then is invalid to try setting a suspend mode.
 	 */
-	if (!max77802->opmode[id] = MAX77802_OFF_PWRREQ) {
+	if (max77802->opmode[id] != MAX77802_OFF_PWRREQ) {
 		dev_warn(&rdev->dev, "%s: is disabled, mode: 0x%x not set\n",
 			 rdev->desc->name, mode);
 		return 0;

Re: [patch] regulator: max77802: precedence error in max77802_set_suspend_mode()

[Javier Martinez Canillas]

Hello Dan,

> On 24/10/2014, at 10:16, Dan Carpenter <dan.carpenter@oracle.com> wrote:
> 
> The "!" operation has higher precedence that the comparison.
> 
> Fixes: 2e0eaa1aa008 ('regulator: max77802: Add set suspend mode for BUCKs and simplify code')
> Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
> 
> diff --git a/drivers/regulator/max77802.c b/drivers/regulator/max77802.c
> index 5839c45..57e37fd 100644
> --- a/drivers/regulator/max77802.c
> +++ b/drivers/regulator/max77802.c
> @@ -179,7 +179,7 @@ static int max77802_set_suspend_mode(struct regulator_dev *rdev,
>     * If the regulator has been disabled for suspend
>     * then is invalid to try setting a suspend mode.
>     */
> -    if (!max77802->opmode[id] = MAX77802_OFF_PWRREQ) {
> +    if (max77802->opmode[id] != MAX77802_OFF_PWRREQ) {
>        dev_warn(&rdev->dev, "%s: is disabled, mode: 0x%x not set\n",
>             rdev->desc->name, mode);
>        return 0;

Thanks for the patch, there is indeed a typo error but $subject is not the correct fix.

The problem is that the "!" operator should not be in the expression so it has be removed and only compare if opmode is equal to MAX72802_OFF_PWRREQ.

With that change feel free to add my Reviewed-by.

Best regards,
Javier

[patch v2] regulator: max77802: fix a test in max77802_set_suspend_mode()

[Dan Carpenter]

The original test triggers a static checker warning.  Javier Martinez
Canillas says that the "!" is a typo and should be removed.

Fixes: 2e0eaa1aa008 ('regulator: max77802: Add set suspend mode for BUCKs and simplify code')
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
---
v2:  The first version of this patch was buggy.  Thanks Javier for
your review.

diff --git a/drivers/regulator/max77802.c b/drivers/regulator/max77802.c
index 5839c45..7718c8a 100644
--- a/drivers/regulator/max77802.c
+++ b/drivers/regulator/max77802.c
@@ -179,7 +179,7 @@ static int max77802_set_suspend_mode(struct regulator_dev *rdev,
 	 * If the regulator has been disabled for suspend
 	 * then is invalid to try setting a suspend mode.
 	 */
-	if (!max77802->opmode[id] = MAX77802_OFF_PWRREQ) {
+	if (max77802->opmode[id] = MAX77802_OFF_PWRREQ) {
 		dev_warn(&rdev->dev, "%s: is disabled, mode: 0x%x not set\n",
 			 rdev->desc->name, mode);
 		return 0;

Re: [patch v2] regulator: max77802: fix a test in max77802_set_suspend_mode()

[Javier Martinez Canillas]

Hello Dan,

On 10/27/2014 11:45 AM, Dan Carpenter wrote:
> The original test triggers a static checker warning.  Javier Martinez
> Canillas says that the "!" is a typo and should be removed.
> 
> Fixes: 2e0eaa1aa008 ('regulator: max77802: Add set suspend mode for BUCKs and simplify code')
> Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
> ---
> v2:  The first version of this patch was buggy.  Thanks Javier for
> your review.
> 
> diff --git a/drivers/regulator/max77802.c b/drivers/regulator/max77802.c
> index 5839c45..7718c8a 100644
> --- a/drivers/regulator/max77802.c
> +++ b/drivers/regulator/max77802.c
> @@ -179,7 +179,7 @@ static int max77802_set_suspend_mode(struct regulator_dev *rdev,
>  	 * If the regulator has been disabled for suspend
>  	 * then is invalid to try setting a suspend mode.
>  	 */
> -	if (!max77802->opmode[id] = MAX77802_OFF_PWRREQ) {
> +	if (max77802->opmode[id] = MAX77802_OFF_PWRREQ) {
>  		dev_warn(&rdev->dev, "%s: is disabled, mode: 0x%x not set\n",
>  			 rdev->desc->name, mode);
>  		return 0;
> 

The typo was not found during testing because the expression always evaluated
to 0 which was expected since a regulator marked to be disabled for suspend
shouldn't have a suspend mode to be set.

But when trying to trigger that specific case the test was indeed failing and
the regulator mode was changed even when the regulator was marked as disabled.

This patch solves the issue by making max77802_set_suspend_mode() to return
early if the regulator was marked as disabled

Thanks a lot for finding this bug.

Acked-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
Tested-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>

Best regards,
Javier

Re: [patch v2] regulator: max77802: fix a test in max77802_set_suspend_mode()

[Mark Brown]

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On Mon, Oct 27, 2014 at 01:45:06PM +0300, Dan Carpenter wrote:
> The original test triggers a static checker warning.  Javier Martinez
> Canillas says that the "!" is a typo and should be removed.

Applied, thanks.

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