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block: fix bogus EFAULT error from SG_IO ioctl 

Whenever blk_fill_sghdr_rq fails, its errno code is ignored and changed to
EFAULT.  This can cause very confusing errors:

  $ sg_persist -k /dev/sda
  persistent reservation in: pass through os error: Bad address

The fix is trivial, just propagate the return value from
blk_fill_sghdr_rq.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Acked-by: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Paolo Bonzini 2015-06-26 11:44:46 +02:00 committed by Jens Axboe
parent 3399a3f746
commit 2c4cffe851
1 changed files with 2 additions and 2 deletions
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4
block/scsi_ioctl.c
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@ -326,8 +326,8 @@ static int sg_io(struct request_queue *q, struct gendisk *bd_disk,
goto out_put_request;
}
ret = -EFAULT;
if (blk_fill_sghdr_rq(q, rq, hdr, mode))
ret = blk_fill_sghdr_rq(q, rq, hdr, mode);
if (ret < 0)
goto out_free_cdb;
ret = 0;