diff options
| author | Joe Lawrence <joe.lawrence@stratus.com> | 2014-08-28 08:15:21 -0600 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2014-08-28 10:03:46 -0600 |
| commit | a492f075450f3ba87de36e5ffe92a9d0c7af9723 (patch) | |
| tree | 61960a71c7fde0eee3d77cda460154d2f7715d2f /block/scsi_ioctl.c | |
| parent | eb571eeade2598635f813b3284d02c13a380301e (diff) | |
| download | linux-a492f075450f3ba87de36e5ffe92a9d0c7af9723.tar.gz linux-a492f075450f3ba87de36e5ffe92a9d0c7af9723.tar.bz2 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 'block/scsi_ioctl.c')
| -rw-r--r-- | block/scsi_ioctl.c | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/block/scsi_ioctl.c b/block/scsi_ioctl.c index 29d056782833..a8b0d0208448 100644 --- a/block/scsi_ioctl.c +++ b/block/scsi_ioctl.c @@ -318,8 +318,8 @@ static int sg_io(struct request_queue *q, struct gendisk *bd_disk, at_head = 1; rq = blk_get_request(q, writing ? WRITE : READ, GFP_KERNEL); - if (!rq) - return -ENOMEM; + if (IS_ERR(rq)) + return PTR_ERR(rq); blk_rq_set_block_pc(rq); if (blk_fill_sghdr_rq(q, rq, hdr, mode)) { @@ -448,8 +448,8 @@ int sg_scsi_ioctl(struct request_queue *q, struct gendisk *disk, fmode_t mode, } rq = blk_get_request(q, in_len ? WRITE : READ, __GFP_WAIT); - if (!rq) { - err = -ENODEV; + if (IS_ERR(rq)) { + err = PTR_ERR(rq); goto error_free_buffer; } @@ -539,8 +539,8 @@ static int __blk_send_generic(struct request_queue *q, struct gendisk *bd_disk, int err; rq = blk_get_request(q, WRITE, __GFP_WAIT); - if (!rq) - return -ENODEV; + if (IS_ERR(rq)) + return PTR_ERR(rq); blk_rq_set_block_pc(rq); rq->timeout = BLK_DEFAULT_SG_TIMEOUT; rq->cmd[0] = cmd; |