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authorBart Van Assche <bvanassche@acm.org>2014-06-02 13:50:52 +0400
committerChristoph Hellwig <hch@lst.de>2014-07-18 00:07:28 +0400
commitfcc95a763444017288b318d48367098850c23c0d (patch)
treeb0944747d52123c4c690998a5d852d5a2ad04897 /drivers/scsi/scsi.c
parent89fb4cd1f717a871ef79fa7debbe840e3225cd54 (diff)
downloadlinux-fcc95a763444017288b318d48367098850c23c0d.tar.xz
scsi: remove two cancel_delayed_work() calls from the mid-layer
scsi_put_command() is either invoked before blk_start_request() or after block layer processing has completed. scsi_cmnd.abort_work is scheduled from inside the SCSI timeout handler. The block layer guarantees that either the regular completion handler (softirq_done_fn()) or the timeout handler (rq_timed_out_fn()) is invoked but not both. This means that scsi_put_command() is never invoked while abort_work is scheduled. Hence remove the cancel_delayed_work() call from scsi_put_command(). Similarly, scsi_abort_command() is only invoked from the SCSI timeout handler. If scsi_abort_command() is invoked for a SCSI command with the SCSI_EH_ABORT_SCHEDULED flag set this means that scmd_eh_abort_handler() has already invoked scsi_queue_insert() and hence that scsi_cmnd.abort_work is no longer pending. Hence also remove the cancel_delayed_work() call from scsi_abort_command(). Signed-off-by: Bart Van Assche <bvanassche@acm.org> Reviewed-by: Hannes Reinecke <hare@suse.de> Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'drivers/scsi/scsi.c')
-rw-r--r--drivers/scsi/scsi.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/scsi/scsi.c b/drivers/scsi/scsi.c
index 88d46fe6bf98..53b8b94e6c84 100644
--- a/drivers/scsi/scsi.c
+++ b/drivers/scsi/scsi.c
@@ -334,7 +334,7 @@ void scsi_put_command(struct scsi_cmnd *cmd)
list_del_init(&cmd->list);
spin_unlock_irqrestore(&cmd->device->list_lock, flags);
- cancel_delayed_work(&cmd->abort_work);
+ BUG_ON(delayed_work_pending(&cmd->abort_work));
__scsi_put_command(cmd->device->host, cmd);
}