diff options
| author | Ming Lei <[email protected]> | 2020-12-02 18:04:19 +0800 |
|---|---|---|
| committer | Martin K. Petersen <[email protected]> | 2020-12-07 21:21:20 -0500 |
| commit | 673235f915318ced5d7ec4b2bfd8cb909e6a4a55 (patch) | |
| tree | 940da5b1c170a193015610961e2b881bf4a34d1f /include/linux/fpga/fpga-mgr.h | |
| parent | eeaf06af6f87e1dba371fbe42674e6f963220b9c (diff) | |
scsi: core: Fix race between handling STS_RESOURCE and completion
When queuing I/O request to LLD, STS_RESOURCE may be returned because:
- Host is in recovery or blocked
- Target queue throttling or target is blocked
- LLD rejection
In these scenarios BLK_STS_DEV_RESOURCE is returned to the block layer to
avoid an unnecessary re-run of the queue. However, all of the requests
queued to this SCSI device may complete immediately after reading
'sdev->device_busy' and BLK_STS_DEV_RESOURCE is returned to block layer. In
that case the current I/O won't get a chance to get queued since it is
invisible at that time for both scsi_run_queue_async() and blk-mq's
RESTART.
Fix the issue by not returning BLK_STS_DEV_RESOURCE in this situation.
Link: https://lore.kernel.org/r/[email protected]
Fixes: 86ff7c2a80cd ("blk-mq: introduce BLK_STS_DEV_RESOURCE")
Cc: Hannes Reinecke <[email protected]>
Cc: Sumit Saxena <[email protected]>
Cc: Kashyap Desai <[email protected]>
Cc: Bart Van Assche <[email protected]>
Cc: Ewan Milne <[email protected]>
Cc: Long Li <[email protected]>
Reported-by: John Garry <[email protected]>
Tested-by: "chenxiang (M)" <[email protected]>
Signed-off-by: Ming Lei <[email protected]>
Signed-off-by: Martin K. Petersen <[email protected]>
Diffstat (limited to 'include/linux/fpga/fpga-mgr.h')
0 files changed, 0 insertions, 0 deletions