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authorJoe Lawrence <joe.lawrence@stratus.com>2014-08-28 08:15:21 -0600
committerJens Axboe <axboe@fb.com>2014-08-28 10:03:46 -0600
commita492f075450f3ba87de36e5ffe92a9d0c7af9723 (patch)
tree61960a71c7fde0eee3d77cda460154d2f7715d2f /drivers/scsi/osst.c
parenteb571eeade2598635f813b3284d02c13a380301e (diff)
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/osst.c')
-rw-r--r--drivers/scsi/osst.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/scsi/osst.c b/drivers/scsi/osst.c
index 0727ea7cc387..dff37a250d79 100644
--- a/drivers/scsi/osst.c
+++ b/drivers/scsi/osst.c
@@ -362,7 +362,7 @@ static int osst_execute(struct osst_request *SRpnt, const unsigned char *cmd,
int write = (data_direction == DMA_TO_DEVICE);
req = blk_get_request(SRpnt->stp->device->request_queue, write, GFP_KERNEL);
- if (!req)
+ if (IS_ERR(req))
return DRIVER_ERROR << 24;
blk_rq_set_block_pc(req);

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