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| author | Joe Lawrence <joe.lawrence@stratus.com> | 2014-08-28 14:15:21 (GMT) |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2014-08-28 16:03:46 (GMT) |
| commit | a492f075450f3ba87de36e5ffe92a9d0c7af9723 (patch) | |
| tree | 61960a71c7fde0eee3d77cda460154d2f7715d2f /drivers/scsi/device_handler/scsi_dh_hp_sw.c | |
| parent | eb571eeade2598635f813b3284d02c13a380301e (diff) | |
| download | linux-a492f075450f3ba87de36e5ffe92a9d0c7af9723.tar.xz | |
block,scsi: fixup blk_get_request dead queue scenarios
The blk_get_request function may fail in low-memory conditions or during
device removal (even if __GFP_WAIT is set). To distinguish between these
errors, modify the blk_get_request call stack to return the appropriate
ERR_PTR. Verify that all callers check the return status and consider
IS_ERR instead of a simple NULL pointer check.
For consistency, make a similar change to the blk_mq_alloc_request leg
of blk_get_request. It may fail if the queue is dead, or the caller was
unwilling to wait.
Signed-off-by: Joe Lawrence <joe.lawrence@stratus.com>
Acked-by: Jiri Kosina <jkosina@suse.cz> [for pktdvd]
Acked-by: Boaz Harrosh <bharrosh@panasas.com> [for osd]
Reviewed-by: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'drivers/scsi/device_handler/scsi_dh_hp_sw.c')
| -rw-r--r-- | drivers/scsi/device_handler/scsi_dh_hp_sw.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/scsi/device_handler/scsi_dh_hp_sw.c b/drivers/scsi/device_handler/scsi_dh_hp_sw.c index e9d9fea..4ee2759 100644 --- a/drivers/scsi/device_handler/scsi_dh_hp_sw.c +++ b/drivers/scsi/device_handler/scsi_dh_hp_sw.c @@ -117,7 +117,7 @@ static int hp_sw_tur(struct scsi_device *sdev, struct hp_sw_dh_data *h) retry: req = blk_get_request(sdev->request_queue, WRITE, GFP_NOIO); - if (!req) + if (IS_ERR(req)) return SCSI_DH_RES_TEMP_UNAVAIL; blk_rq_set_block_pc(req); @@ -247,7 +247,7 @@ static int hp_sw_start_stop(struct hp_sw_dh_data *h) struct request *req; req = blk_get_request(h->sdev->request_queue, WRITE, GFP_ATOMIC); - if (!req) + if (IS_ERR(req)) return SCSI_DH_RES_TEMP_UNAVAIL; blk_rq_set_block_pc(req); |