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| author | FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> | 2009-04-03 19:28:06 +0900 |
|---|---|---|
| committer | James Bottomley <James.Bottomley@HansenPartnership.com> | 2009-04-03 10:23:16 -0500 |
| commit | 015640edb1f346e0b2eda703587c4cd1c310ec1d (patch) | |
| tree | fd7016b45278d26eac055f1f613632b40832f46e /drivers/scsi/sg.c | |
| parent | 1beb6fa85ca9afaee109811a3f4a984232a32a4f (diff) | |
| download | linux-015640edb1f346e0b2eda703587c4cd1c310ec1d.tar.gz linux-015640edb1f346e0b2eda703587c4cd1c310ec1d.tar.bz2 linux-015640edb1f346e0b2eda703587c4cd1c310ec1d.zip | |
[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 <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>
Diffstat (limited to 'drivers/scsi/sg.c')
| -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 1e405184ed76..82312df9b0bf 100644 --- a/drivers/scsi/sg.c +++ b/drivers/scsi/sg.c @@ -1312,8 +1312,10 @@ 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 = { @@ -2099,7 +2101,8 @@ 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 |