diff options
| author | FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> | 2009-04-06 20:55:06 +0000 |
|---|---|---|
| committer | Chris Wright <chrisw@sous-sol.org> | 2009-04-27 10:37:02 -0700 |
| commit | 43fce3f341cbe7c6d7a58699655b954bb4f7689c (patch) | |
| tree | 62afd6b4afb51b7325207fcb99233320244cf3bd /drivers | |
| parent | 74c646d9ca31798ec2bf862f5b7e1737b543d066 (diff) | |
SCSI: sg: fix q->queue_lock on scsi_error_handler path
upstream commit: 015640edb1f346e0b2eda703587c4cd1c310ec1d
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 <fujita.tomonori@lab.ntt.co.jp>
Acked-by: Douglas Gilbert <dgilbert@interlog.com>
Cc: Stable Tree <stable@kernel.org>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/scsi/sg.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c index 052850e8179..5e390d2df2d 100644 --- a/drivers/scsi/sg.c +++ b/drivers/scsi/sg.c @@ -1323,8 +1323,10 @@ static void sg_rq_end_io(struct request *rq, int uptodate) wake_up_interruptible(&sfp->read_wait); kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN); kref_put(&sfp->f_ref, sg_remove_sfp); - } else - execute_in_process_context(sg_rq_end_io_usercontext, &srp->ew); + } else { + INIT_WORK(&srp->ew.work, sg_rq_end_io_usercontext); + schedule_work(&srp->ew.work); + } } static struct file_operations sg_fops = { @@ -2134,7 +2136,8 @@ static void sg_remove_sfp(struct kref *kref) write_unlock_irqrestore(&sg_index_lock, iflags); wake_up_interruptible(&sdp->o_excl_wait); - execute_in_process_context(sg_remove_sfp_usercontext, &sfp->ew); + INIT_WORK(&sfp->ew.work, sg_remove_sfp_usercontext); + schedule_work(&sfp->ew.work); } static int |