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| author | Joe Lawrence | 2014-08-28 16:15:21 +0200 |
|---|---|---|
| committer | Jens Axboe | 2014-08-28 18:03:46 +0200 |
| commit | a492f075450f3ba87de36e5ffe92a9d0c7af9723 (patch) | |
| tree | 61960a71c7fde0eee3d77cda460154d2f7715d2f /drivers/block/paride/pd.c | |
| parent | block,scsi: verify return pointer from blk_get_request (diff) | |
| download | kernel-qcow2-linux-a492f075450f3ba87de36e5ffe92a9d0c7af9723.tar.gz kernel-qcow2-linux-a492f075450f3ba87de36e5ffe92a9d0c7af9723.tar.xz kernel-qcow2-linux-a492f075450f3ba87de36e5ffe92a9d0c7af9723.zip | |
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/block/paride/pd.c')
| -rw-r--r-- | drivers/block/paride/pd.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/block/paride/pd.c b/drivers/block/paride/pd.c index ca831f741d89..d48715b287e6 100644 --- a/drivers/block/paride/pd.c +++ b/drivers/block/paride/pd.c @@ -722,8 +722,8 @@ static int pd_special_command(struct pd_unit *disk, int err = 0; rq = blk_get_request(disk->gd->queue, READ, __GFP_WAIT); - if (!rq) - return -ENODEV; + if (IS_ERR(rq)) + return PTR_ERR(rq); rq->cmd_type = REQ_TYPE_SPECIAL; rq->special = func; |