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authorStanley Chu <stanley.chu@mediatek.com>2020-08-11 16:18:58 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2020-09-03 11:26:59 +0200
commit37528b3ee9e19abbd55a61c8f461cc94025492e8 (patch)
treeaeffb8262e7fde6cdba2d9bac5e419bc9b540468 /drivers/scsi/ufs
parenta39ba0fdcdfd79ca35b2d708d2daf677d9a56816 (diff)
scsi: ufs: Clean up completed request without interrupt notification
[ Upstream commit b10178ee7fa88b68a9e8adc06534d2605cb0ec23 ] If somehow no interrupt notification is raised for a completed request and its doorbell bit is cleared by host, UFS driver needs to cleanup its outstanding bit in ufshcd_abort(). Otherwise, system may behave abnormally in the following scenario: After ufshcd_abort() returns, this request will be requeued by SCSI layer with its outstanding bit set. Any future completed request will trigger ufshcd_transfer_req_compl() to handle all "completed outstanding bits". At this time the "abnormal outstanding bit" will be detected and the "requeued request" will be chosen to execute request post-processing flow. This is wrong because this request is still "alive". Link: https://lore.kernel.org/r/20200811141859.27399-2-huobean@gmail.com Reviewed-by: Can Guo <cang@codeaurora.org> Acked-by: Avri Altman <avri.altman@wdc.com> Signed-off-by: Stanley Chu <stanley.chu@mediatek.com> Signed-off-by: Bean Huo <beanhuo@micron.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/scsi/ufs')
-rw-r--r--drivers/scsi/ufs/ufshcd.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index b51ccbf6cc59..5e502e160554 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -6140,7 +6140,7 @@ static int ufshcd_abort(struct scsi_cmnd *cmd)
/* command completed already */
dev_err(hba->dev, "%s: cmd at tag %d successfully cleared from DB.\n",
__func__, tag);
- goto out;
+ goto cleanup;
} else {
dev_err(hba->dev,
"%s: no response from device. tag = %d, err %d\n",
@@ -6174,6 +6174,7 @@ static int ufshcd_abort(struct scsi_cmnd *cmd)
goto out;
}
+cleanup:
scsi_dma_unmap(cmd);
spin_lock_irqsave(host->host_lock, flags);