[PATCH] bus: mhi: core: Fix check for syserr at power_up

[PATCH] bus: mhi: core: Fix check for syserr at power_up

[Jeffrey Hugo]

The check to see if we have reset the device after detecting syserr at
power_up is inverted.  wait_for_event_timeout() returns 0 on failure,
and a positive value on success.  The check is looking for non-zero
as a failure, which is likely to incorrectly cause a device init failure
if syserr was detected at power_up.  Fix this.

Fixes: e18d4e9fa79b ("bus: mhi: core: Handle syserr during power_up")
Signed-off-by: Jeffrey Hugo <jhugo@codeaurora.org>
---
 drivers/bus/mhi/core/pm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/bus/mhi/core/pm.c b/drivers/bus/mhi/core/pm.c
index 681960c..36ab7aa 100644
--- a/drivers/bus/mhi/core/pm.c
+++ b/drivers/bus/mhi/core/pm.c
@@ -1092,7 +1092,7 @@ int mhi_async_power_up(struct mhi_controller *mhi_cntrl)
 							   &val) ||
 					!val,
 				msecs_to_jiffies(mhi_cntrl->timeout_ms));
-		if (ret) {
+		if (!ret) {
 			ret = -EIO;
 			dev_info(dev, "Failed to reset MHI due to syserr state\n");
 			goto error_bhi_offset;
-- 
Qualcomm Technologies, Inc. is a member of the
Code Aurora Forum, a Linux Foundation Collaborative Project.

Re: [PATCH] bus: mhi: core: Fix check for syserr at power_up

[Loic Poulain]

On Fri, 12 Feb 2021 at 22:27, Jeffrey Hugo <jhugo@codeaurora.org> wrote:
>
> The check to see if we have reset the device after detecting syserr at
> power_up is inverted.  wait_for_event_timeout() returns 0 on failure,
> and a positive value on success.  The check is looking for non-zero
> as a failure, which is likely to incorrectly cause a device init failure
> if syserr was detected at power_up.  Fix this.
>
> Fixes: e18d4e9fa79b ("bus: mhi: core: Handle syserr during power_up")
> Signed-off-by: Jeffrey Hugo <jhugo@codeaurora.org>

Reviewed-by: Loic Poulain <loic.poulain@linaro.org>

> ---
>  drivers/bus/mhi/core/pm.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/bus/mhi/core/pm.c b/drivers/bus/mhi/core/pm.c
> index 681960c..36ab7aa 100644
> --- a/drivers/bus/mhi/core/pm.c
> +++ b/drivers/bus/mhi/core/pm.c
> @@ -1092,7 +1092,7 @@ int mhi_async_power_up(struct mhi_controller *mhi_cntrl)
>                                                            &val) ||
>                                         !val,
>                                 msecs_to_jiffies(mhi_cntrl->timeout_ms));
> -               if (ret) {
> +               if (!ret) {
>                         ret = -EIO;
>                         dev_info(dev, "Failed to reset MHI due to syserr state\n");
>                         goto error_bhi_offset;
> --
> Qualcomm Technologies, Inc. is a member of the
> Code Aurora Forum, a Linux Foundation Collaborative Project.
>

Re: [PATCH] bus: mhi: core: Fix check for syserr at power_up

[Manivannan Sadhasivam]

On Fri, Feb 12, 2021 at 02:27:23PM -0700, Jeffrey Hugo wrote:
> The check to see if we have reset the device after detecting syserr at
> power_up is inverted.  wait_for_event_timeout() returns 0 on failure,
> and a positive value on success.  The check is looking for non-zero
> as a failure, which is likely to incorrectly cause a device init failure
> if syserr was detected at power_up.  Fix this.
> 
> Fixes: e18d4e9fa79b ("bus: mhi: core: Handle syserr during power_up")
> Signed-off-by: Jeffrey Hugo <jhugo@codeaurora.org>

Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>

Thanks,
Mani

> ---
>  drivers/bus/mhi/core/pm.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/bus/mhi/core/pm.c b/drivers/bus/mhi/core/pm.c
> index 681960c..36ab7aa 100644
> --- a/drivers/bus/mhi/core/pm.c
> +++ b/drivers/bus/mhi/core/pm.c
> @@ -1092,7 +1092,7 @@ int mhi_async_power_up(struct mhi_controller *mhi_cntrl)
>  							   &val) ||
>  					!val,
>  				msecs_to_jiffies(mhi_cntrl->timeout_ms));
> -		if (ret) {
> +		if (!ret) {
>  			ret = -EIO;
>  			dev_info(dev, "Failed to reset MHI due to syserr state\n");
>  			goto error_bhi_offset;
> -- 
> Qualcomm Technologies, Inc. is a member of the
> Code Aurora Forum, a Linux Foundation Collaborative Project.
> 

Re: [PATCH] bus: mhi: core: Fix check for syserr at power_up

[Manivannan Sadhasivam]

On Fri, Feb 12, 2021 at 02:27:23PM -0700, Jeffrey Hugo wrote:
> The check to see if we have reset the device after detecting syserr at
> power_up is inverted.  wait_for_event_timeout() returns 0 on failure,
> and a positive value on success.  The check is looking for non-zero
> as a failure, which is likely to incorrectly cause a device init failure
> if syserr was detected at power_up.  Fix this.
> 
> Fixes: e18d4e9fa79b ("bus: mhi: core: Handle syserr during power_up")
> Signed-off-by: Jeffrey Hugo <jhugo@codeaurora.org>

Applied to mhi-next!

Thanks,
Mani

> ---
>  drivers/bus/mhi/core/pm.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/bus/mhi/core/pm.c b/drivers/bus/mhi/core/pm.c
> index 681960c..36ab7aa 100644
> --- a/drivers/bus/mhi/core/pm.c
> +++ b/drivers/bus/mhi/core/pm.c
> @@ -1092,7 +1092,7 @@ int mhi_async_power_up(struct mhi_controller *mhi_cntrl)
>  							   &val) ||
>  					!val,
>  				msecs_to_jiffies(mhi_cntrl->timeout_ms));
> -		if (ret) {
> +		if (!ret) {
>  			ret = -EIO;
>  			dev_info(dev, "Failed to reset MHI due to syserr state\n");
>  			goto error_bhi_offset;
> -- 
> Qualcomm Technologies, Inc. is a member of the
> Code Aurora Forum, a Linux Foundation Collaborative Project.
> 

Re: [PATCH] bus: mhi: core: Fix check for syserr at power_up

[patchwork-bot+linux-arm-msm]

Hello:

This patch was applied to qcom/linux.git (refs/heads/for-next):

On Fri, 12 Feb 2021 14:27:23 -0700 you wrote:
> The check to see if we have reset the device after detecting syserr at
> power_up is inverted.  wait_for_event_timeout() returns 0 on failure,
> and a positive value on success.  The check is looking for non-zero
> as a failure, which is likely to incorrectly cause a device init failure
> if syserr was detected at power_up.  Fix this.
> 
> Fixes: e18d4e9fa79b ("bus: mhi: core: Handle syserr during power_up")
> Signed-off-by: Jeffrey Hugo <jhugo@codeaurora.org>
> 
> [...]

Here is the summary with links:
  - bus: mhi: core: Fix check for syserr at power_up
    https://git.kernel.org/qcom/c/6403298c58d4

You are awesome, thank you!
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