[SCSI] sg: fix q->queue_lock on scsi_error_handler path

sg_rq_end_io() is called via rq->end_io. In some rare cases,
sg_rq_end_io calls blk_put_request/blk_rq_unmap_user (when a program
issuing a command has gone before the command completion; e.g. by
interrupting a program issuing a command before the command
completes).

We can't call blk_put_request/blk_rq_unmap_user in interrupt so the
commit c96952ed7031e7c576ecf90cf95b8ec099d5295a uses
execute_in_process_context().

The problem is that scsi_error_handler() calls rq->end_io too. We
can't call blk_put_request/blk_rq_unmap_user too in this path (we hold
q->queue_lock).

To avoid the above problem, in these rare cases, this patch always
uses schedule_work() instead of execute_in_process_context().

Signed-off-by: FUJITA Tomonori <[email protected]>
Acked-by: Douglas Gilbert <[email protected]>
Cc: Stable Tree <[email protected]>
Signed-off-by: James Bottomley <[email protected]>

0 files changed, 0 insertions, 0 deletions