linux-kernel - Re: [PATCH] scsi: ufs: Fix incorrect ufshcd_state after ufshcd_reset_and

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Date:   Mon, 1 Mar 2021 15:54:45 -0800
From:   Asutosh Das <asutoshd@...eaurora.org>
To:     Adrian Hunter <adrian.hunter@...el.com>
Cc:     "Martin K . Petersen" <martin.petersen@...cle.com>,
        "James E . J . Bottomley" <jejb@...ux.ibm.com>,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Avri Altman <avri.altman@....com>,
        Bean Huo <huobean@...il.com>, Can Guo <cang@...eaurora.org>,
        Stanley Chu <stanley.chu@...iatek.com>
Subject: Re: [PATCH] scsi: ufs: Fix incorrect ufshcd_state after
 ufshcd_reset_and_restore()

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@...el.com>
>---

Reviewed-by: Asutosh Das <asutoshd@...eaurora.org>

> 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
>