linux-kernel - Re: [PATCH] bus: mhi: core: Fix check for syserr at power

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Date:   Mon, 15 Feb 2021 08:25:09 +0100
From:   Loic Poulain <loic.poulain@...aro.org>
To:     Jeffrey Hugo <jhugo@...eaurora.org>
Cc:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        Hemant Kumar <hemantk@...eaurora.org>,
        Bhaumik Bhatt <bbhatt@...eaurora.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] bus: mhi: core: Fix check for syserr at power_up

On Fri, 12 Feb 2021 at 22:27, Jeffrey Hugo <jhugo@...eaurora.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@...eaurora.org>

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