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authorMike Christie <michaelc@cs.wisc.edu>2009-07-15 15:02:59 -0500
committerJames Bottomley <James.Bottomley@HansenPartnership.com>2009-07-30 08:50:00 -0500
commit5c656af7e4edfe44c85034d6fa7002909f9c3c59 (patch)
treece31cc38af5c2cabfc117f48b4b7806571dac8c9
parent94bced3c1b371014cbd187f2df5539b13a0e3b90 (diff)
[SCSI] qla4xxx: add timeout handler
Recently dm-multipath began calling blk_abort_queue. This causes all the commands/request running on the path to have the timeout function called. If a path does go down, and the LLD returns DID_*, dm-multpiath will eventually get this error and begin to call the cmd timeout handler. qla4xxx currently does not set a timed out handler and so the default one could return BLK_EH_NOT_HANDLED and end up firing the scsi eh and stopping IO to all paths on the host when only one path is affected. For software and offload iscsi we have a timed out handler already. This patch adds a driver specific one to qla4xxx because there are some ddb->state and session->state and command completion races that are better handled in the LLD. This also handles the problem where if the session is down, we do not need the scsi eh to run until the transport code has tried to reconnect us. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
-rw-r--r--drivers/scsi/qla4xxx/ql4_os.c17
1 files changed, 17 insertions, 0 deletions
diff --git a/drivers/scsi/qla4xxx/ql4_os.c b/drivers/scsi/qla4xxx/ql4_os.c
index ec9da6ce848..6841883b361 100644
--- a/drivers/scsi/qla4xxx/ql4_os.c
+++ b/drivers/scsi/qla4xxx/ql4_os.c
@@ -66,6 +66,7 @@ static int qla4xxx_sess_get_param(struct iscsi_cls_session *sess,
static int qla4xxx_host_get_param(struct Scsi_Host *shost,
enum iscsi_host_param param, char *buf);
static void qla4xxx_recovery_timedout(struct iscsi_cls_session *session);
+static enum blk_eh_timer_return qla4xxx_eh_cmd_timed_out(struct scsi_cmnd *sc);
/*
* SCSI host template entry points
@@ -89,6 +90,7 @@ static struct scsi_host_template qla4xxx_driver_template = {
.eh_device_reset_handler = qla4xxx_eh_device_reset,
.eh_target_reset_handler = qla4xxx_eh_target_reset,
.eh_host_reset_handler = qla4xxx_eh_host_reset,
+ .eh_timed_out = qla4xxx_eh_cmd_timed_out,
.slave_configure = qla4xxx_slave_configure,
.slave_alloc = qla4xxx_slave_alloc,
@@ -124,6 +126,21 @@ static struct iscsi_transport qla4xxx_iscsi_transport = {
static struct scsi_transport_template *qla4xxx_scsi_transport;
+static enum blk_eh_timer_return qla4xxx_eh_cmd_timed_out(struct scsi_cmnd *sc)
+{
+ struct iscsi_cls_session *session;
+ struct ddb_entry *ddb_entry;
+
+ session = starget_to_session(scsi_target(sc->device));
+ ddb_entry = session->dd_data;
+
+ /* if we are not logged in then the LLD is going to clean up the cmd */
+ if (atomic_read(&ddb_entry->state) != DDB_STATE_ONLINE)
+ return BLK_EH_RESET_TIMER;
+ else
+ return BLK_EH_NOT_HANDLED;
+}
+
static void qla4xxx_recovery_timedout(struct iscsi_cls_session *session)
{
struct ddb_entry *ddb_entry = session->dd_data;