linux-kernel - [PATCH 4.9 107/152] scsi: ufs: introduce a new ufshcd_statea UFSHCD_STATE_EH

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Message-Id: <20170410164205.763362655@linuxfoundation.org>
Date:   Mon, 10 Apr 2017 18:42:39 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Zang Leigang <zangleigang@...ilicon.com>,
        Subhash Jadavani <subhashj@...eaurora.org>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Sasha Levin <alexander.levin@...izon.com>
Subject: [PATCH 4.9 107/152] scsi: ufs: introduce a new ufshcd_statea UFSHCD_STATE_EH_SCHEDULED

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Zang Leigang <zangleigang@...ilicon.com>

[ Upstream commit 141f81651037ea109188a6bafdc5c9a318bd5a46 ]

Add a new ufshcd_state, indicats that an err handler may get to run
immediately. Use UFSHCD_STATE_ERROR here looks not literaly correct.

Signed-off-by: Zang Leigang <zangleigang@...ilicon.com>
Reviewed-by: Subhash Jadavani <subhashj@...eaurora.org>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/scsi/ufs/ufshcd.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -123,6 +123,7 @@ enum {
 	UFSHCD_STATE_RESET,
 	UFSHCD_STATE_ERROR,
 	UFSHCD_STATE_OPERATIONAL,
+	UFSHCD_STATE_EH_SCHEDULED,
 };
 
 /* UFSHCD error handling flags */
@@ -1439,6 +1440,7 @@ static int ufshcd_queuecommand(struct Sc
 	switch (hba->ufshcd_state) {
 	case UFSHCD_STATE_OPERATIONAL:
 		break;
+	case UFSHCD_STATE_EH_SCHEDULED:
 	case UFSHCD_STATE_RESET:
 		err = SCSI_MLQUEUE_HOST_BUSY;
 		goto out_unlock;
@@ -4196,7 +4198,7 @@ static void ufshcd_check_errors(struct u
 			/* block commands from scsi mid-layer */
 			scsi_block_requests(hba->host);
 
-			hba->ufshcd_state = UFSHCD_STATE_ERROR;
+			hba->ufshcd_state = UFSHCD_STATE_EH_SCHEDULED;
 			schedule_work(&hba->eh_work);
 		}
 	}