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scsi: ufs: fix exception event handling

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The device can set the exception event bit in one of the response UPIU,
for example to notify the need for urgent BKOPs operation.  In such a
case, the host driver calls ufshcd_exception_event_handler to handle
this notification.  When trying to check the exception event status (for
finding the cause for the exception event), the device may be busy with
additional SCSI commands handling and may not respond within the 100ms
timeout.

To prevent that, we need to block SCSI commands during handling of
exception events and allow retransmissions of the query requests, in
case of timeout.

Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>
Signed-off-by: Maya Erez <merez@codeaurora.org>
Signed-off-by: Can Guo <cang@codeaurora.org>
Signed-off-by: Asutosh Das <asutoshd@codeaurora.org>
Reviewed-by: Subhash Jadavani <subhashj@codeaurora.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Maya Erez 2018-05-03 16:37:16 +05:30 committed by Martin K. Petersen
parent 60d6d22d85
commit 2e3611e954
1 changed files with 2 additions and 0 deletions
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2
drivers/scsi/ufs/ufshcd.c
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@ -5073,6 +5073,7 @@ static void ufshcd_exception_event_handler(struct work_struct *work)
hba = container_of(work, struct ufs_hba, eeh_work);
pm_runtime_get_sync(hba->dev);
scsi_block_requests(hba->host);
err = ufshcd_get_ee_status(hba, &status);
if (err) {
dev_err(hba->dev, "%s: failed to get exception status %d\n",
@ -5086,6 +5087,7 @@ static void ufshcd_exception_event_handler(struct work_struct *work)
ufshcd_bkops_exception_event_handler(hba);
out:
scsi_unblock_requests(hba->host);
pm_runtime_put_sync(hba->dev);
return;
}