linux-kernel - Re: [PATCH v3 1/6] bus: mhi: core: Make sure to powerdown if mhi_sync_power

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Message-ID: <20200430165548.GE9449@Mani-XPS-13-9360>
Date:   Thu, 30 Apr 2020 22:25:48 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     Jeffrey Hugo <jhugo@...eaurora.org>
Cc:     hemantk@...eaurora.org, bbhatt@...eaurora.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/6] bus: mhi: core: Make sure to powerdown if
 mhi_sync_power_up fails

On Mon, Apr 27, 2020 at 09:59:08AM -0600, Jeffrey Hugo wrote:
> Powerdown is necessary if mhi_sync_power_up fails due to a timeout, to
> clean up the resources.  Otherwise a BUG could be triggered when
> attempting to clean up MSIs because the IRQ is still active from a
> request_irq().
> 
> Signed-off-by: Jeffrey Hugo <jhugo@...eaurora.org>

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

Thanks,
Mani

> ---
>  drivers/bus/mhi/core/pm.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/bus/mhi/core/pm.c b/drivers/bus/mhi/core/pm.c
> index 52690cb..dc83d65 100644
> --- a/drivers/bus/mhi/core/pm.c
> +++ b/drivers/bus/mhi/core/pm.c
> @@ -902,7 +902,11 @@ int mhi_sync_power_up(struct mhi_controller *mhi_cntrl)
>  			   MHI_PM_IN_ERROR_STATE(mhi_cntrl->pm_state),
>  			   msecs_to_jiffies(mhi_cntrl->timeout_ms));
>  
> -	return (MHI_IN_MISSION_MODE(mhi_cntrl->ee)) ? 0 : -EIO;
> +	ret = (MHI_IN_MISSION_MODE(mhi_cntrl->ee)) ? 0 : -ETIMEDOUT;
> +	if (ret)
> +		mhi_power_down(mhi_cntrl, false);
> +
> +	return ret;
>  }
>  EXPORT_SYMBOL(mhi_sync_power_up);
>  
> -- 
> Qualcomm Technologies, Inc. is a member of the
> Code Aurora Forum, a Linux Foundation Collaborative Project.