From: Mike Christie <michaelc@xxxxxxxxxxx>
In qla4xxx's probe it will call the iscsi session setup functions
for session that got setup on the initial start. This then makes
it easy for the iscsi class to export a helper which indicates
when those scans are done.
Signed-off-by: Mike Christie <michaelc@xxxxxxxxxxx>
---
drivers/scsi/scsi_transport_iscsi.c | 38 ++++++++++++++++++++++++++++++++--
include/scsi/scsi_transport_iscsi.h | 3 +-
2 files changed, 37 insertions(+), 4 deletions(-)
diff --git a/drivers/scsi/scsi_transport_iscsi.c b/drivers/scsi/scsi_transport_iscsi.c
index af88955..af17997 100644
--- a/drivers/scsi/scsi_transport_iscsi.c
+++ b/drivers/scsi/scsi_transport_iscsi.c
@@ -127,6 +127,7 @@ static int iscsi_setup_host(struct transport_container *tc, struct device *dev,
memset(ihost, 0, sizeof(*ihost));
INIT_LIST_HEAD(&ihost->sessions);
mutex_init(&ihost->mutex);
+ atomic_set(&ihost->nr_scans, 0);
snprintf(ihost->scan_workq_name, KOBJ_NAME_LEN, "iscsi_scan_%d",
shost->host_no);
@@ -284,6 +285,25 @@ static int iscsi_is_session_dev(const struct device *dev)
return dev->release == iscsi_session_release;
}
+/**
+ * iscsi_scan_finished - helper to report when running scans are done
+ * @shost: scsi host
+ * @time: scan run time
+ *
+ * This function can be used by drives like qla4xxx to report to the scsi
+ * layer when the scans it kicked off at module load time are done.
+ */
+int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time)
+{
+ struct iscsi_host *ihost = shost->shost_data;
+ /*
+ * qla4xxx will have kicked off some session unblocks before calling
+ * scsi_scan_host, so just wait for them to complete.
+ */
+ return !atomic_read(&ihost->nr_scans);
+}
+EXPORT_SYMBOL_GPL(iscsi_scan_finished);
+
static int iscsi_user_scan(struct Scsi_Host *shost, uint channel,
uint id, uint lun)
{
@@ -306,17 +326,21 @@ static void iscsi_scan_session(struct work_struct *work)
{
struct iscsi_cls_session *session =
container_of(work, struct iscsi_cls_session, scan_work);
+ struct Scsi_Host *shost = iscsi_session_to_shost(session);
+ struct iscsi_host *ihost = shost->shost_data;
unsigned long flags;
spin_lock_irqsave(&session->lock, flags);
if (session->state != ISCSI_SESSION_LOGGED_IN) {
spin_unlock_irqrestore(&session->lock, flags);
- return;
+ goto done;
}
spin_unlock_irqrestore(&session->lock, flags);
scsi_scan_target(&session->dev, 0, session->target_id,
SCAN_WILD_CARD, 1);
+done:
+ atomic_dec(&ihost->nr_scans);
}
static void session_recovery_timedout(struct work_struct *work)
@@ -366,7 +390,15 @@ void iscsi_unblock_session(struct iscsi_cls_session *session)
spin_unlock_irqrestore(&session->lock, flags);
__iscsi_unblock_session(session);
- queue_work(ihost->scan_workq, &session->scan_work);
+ /*
+ * Only do kernel scanning if the driver is properly hooked into
+ * the async scanning code (drivers like iscsi_tcp do login and
+ * scanning from userspace).
+ */
+ if (shost->hostt->scan_finished) {
+ if (queue_work(ihost->scan_workq, &session->scan_work))
+ atomic_inc(&ihost->nr_scans);
+ }
}
EXPORT_SYMBOL_GPL(iscsi_unblock_session);
@@ -550,7 +582,7 @@ void iscsi_remove_session(struct iscsi_cls_session *session)
session->state = ISCSI_SESSION_FREE;
spin_unlock_irqrestore(&session->lock, flags);
__iscsi_unblock_session(session);
- iscsi_unbind_session(session);
+ __iscsi_unbind_session(&session->unbind_work);
/* flush running scans */
flush_workqueue(ihost->scan_workq);
diff --git a/include/scsi/scsi_transport_iscsi.h b/include/scsi/scsi_transport_iscsi.h
index 1f0ec46..83693ba 100644
--- a/include/scsi/scsi_transport_iscsi.h
+++ b/include/scsi/scsi_transport_iscsi.h
@@ -203,6 +203,7 @@ struct iscsi_cls_session {
struct iscsi_host {
struct list_head sessions;
+ atomic_t nr_scans;
struct mutex mutex;
struct workqueue_struct *scan_workq;
char scan_workq_name[KOBJ_NAME_LEN];
@@ -229,6 +230,6 @@ extern struct iscsi_cls_conn *iscsi_create_conn(struct iscsi_cls_session *sess,
extern int iscsi_destroy_conn(struct iscsi_cls_conn *conn);
extern void iscsi_unblock_session(struct iscsi_cls_session *session);
extern void iscsi_block_session(struct iscsi_cls_session *session);
-
+extern int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time);
#endif
--
1.5.2.1
-
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