Re: [PATCH] scsi: ufs: Fix incorrect ufshcd_state after ufshcd_reset_and_restore()

[Asutosh Das]

On Mon, Mar 01 2021 at 11:19 -0800, Adrian Hunter wrote:
> If ufshcd_probe_hba() fails it sets ufshcd_state to UFSHCD_STATE_ERROR,
> however, if it is called again, as it is within a loop in
> ufshcd_reset_and_restore(), and succeeds, then it will not set the state
> back to UFSHCD_STATE_OPERATIONAL unless the state was
> UFSHCD_STATE_RESET.
>
> That can result in the state being UFSHCD_STATE_ERROR even though
> ufshcd_reset_and_restore() is successful and returns zero.
>
> Fix by initializing the state to UFSHCD_STATE_RESET in the start of each
> loop in ufshcd_reset_and_restore().  If there is an error,
> ufshcd_reset_and_restore() will change the state to UFSHCD_STATE_ERROR,
> otherwise ufshcd_probe_hba() will have set the state appropriately.
>
> Fixes: 4db7a2360597 ("scsi: ufs: Fix concurrency of error handler and other error recovery paths")
> Signed-off-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
> ---

Reviewed-by: Asutosh Das <asutoshd@xxxxxxxxxxxxxx>

> drivers/scsi/ufs/ufshcd.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> index 77161750c9fb..91a403afe038 100644
> --- a/drivers/scsi/ufs/ufshcd.c
> +++ b/drivers/scsi/ufs/ufshcd.c
> @@ -7031,6 +7031,8 @@ static int ufshcd_reset_and_restore(struct ufs_hba *hba)
> 	spin_unlock_irqrestore(hba->host->host_lock, flags);
>
> 	do {
> +		hba->ufshcd_state = UFSHCD_STATE_RESET;
> +
> 		/* Reset the attached device */
> 		ufshcd_device_reset(hba);
>
> --
> 2.17.1