[PATCH] scsi: ufs: preventing bus hang crash during emergency power off

[Bart Van Assche]

On 5/19/25 12:38 AM, Bo Ye wrote:
> diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
> index 7735421e3991..a1013aea8e90 100644
> --- a/drivers/ufs/core/ufshcd.c
> +++ b/drivers/ufs/core/ufshcd.c
> @@ -10262,6 +10262,7 @@ static void ufshcd_wl_shutdown(struct device *dev)
>   		scsi_device_set_state(sdev, SDEV_OFFLINE);
>   		mutex_unlock(&sdev->state_mutex);
>   	}
> +	ufshcd_wait_for_doorbell_clr(hba, 5 * USEC_PER_SEC);
>   	__ufshcd_wl_suspend(hba, UFS_SHUTDOWN_PM);
>   
>   	/*

This code path is not only triggered when using a UFSHCI 3.0 controller
but also when using a UFSHCI 4.0 controller.
ufshcd_wait_for_doorbell_clr() only supports the legacy single doorbell
mode. Please make sure that the fix supports both the legacy single
doorbell mode and MCQ.

Thanks,

Bart.