From: Mike Christie <michaelc@xxxxxxxxxxx>
If the driver/lib has called scsi_done and cleaned up internally but
scsi layer has not yet called blk_mark_rq_complete when the command
times out we hit a problem if the timeout code calls blk_mark_rq_complete first.
When the time out code calls into the driver we were returning
BLK_EH_RESET_TIMER and that causes the timeout code to just call
us again later.
We need to be calling BLK_EH_HANDLED so the timeout code can complete
the completion process because it had called blk_mark_rq_complete
on the command and now owns its processing.
Signed-off-by: Mike Christie <michaelc@xxxxxxxxxxx>
---
drivers/scsi/libiscsi.c | 20 ++++++++++----------
1 files changed, 10 insertions(+), 10 deletions(-)
diff --git a/drivers/scsi/libiscsi.c b/drivers/scsi/libiscsi.c
index 911a4a9..b189227 100644
--- a/drivers/scsi/libiscsi.c
+++ b/drivers/scsi/libiscsi.c
@@ -1909,6 +1909,16 @@ static enum blk_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *sc)
ISCSI_DBG_EH(session, "scsi cmd %p timedout\n", sc);
spin_lock(&session->lock);
+ task = (struct iscsi_task *)sc->SCp.ptr;
+ if (!task) {
+ /*
+ * Raced with completion. Blk layer has taken ownership
+ * so let timeout code complete it now.
+ */
+ rc = BLK_EH_HANDLED;
+ goto done;
+ }
+
if (session->state != ISCSI_STATE_LOGGED_IN) {
/*
* We are probably in the middle of iscsi recovery so let
@@ -1925,16 +1935,6 @@ static enum blk_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *sc)
goto done;
}
- task = (struct iscsi_task *)sc->SCp.ptr;
- if (!task) {
- /*
- * Raced with completion. Just reset timer, and let it
- * complete normally
- */
- rc = BLK_EH_RESET_TIMER;
- goto done;
- }
-
/*
* If we have sent (at least queued to the network layer) a pdu or
* recvd one for the task since the last timeout ask for
--
1.7.6
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