This is a note to let you know that I've just added the patch titled
scsi: iscsi: Add helper to remove a session from the kernel
to the 5.18-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
scsi-iscsi-add-helper-to-remove-a-session-from-the-k.patch
and it can be found in the queue-5.18 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 9038867f740b7c5709f64ad0f712430ad50e009d
Author: Mike Christie <michael.christie@xxxxxxxxxx>
Date: Thu Jun 16 17:27:36 2022 -0500
scsi: iscsi: Add helper to remove a session from the kernel
[ Upstream commit bb42856bfd54fda1cbc7c470fcf5db1596938f4f ]
During qedi shutdown we need to stop the iSCSI layer from sending new nops
as pings and from responding to target ones and make sure there is no
running connection cleanups. Commit d1f2ce77638d ("scsi: qedi: Fix host
removal with running sessions") converted the driver to use the libicsi
helper to drive session removal, so the above issues could be handled. The
problem is that during system shutdown iscsid will not be running so when
we try to remove the root session we will hang waiting for userspace to
reply.
Add a helper that will drive the destruction of sessions like these during
system shutdown.
Link: https://lore.kernel.org/r/20220616222738.5722-5-michael.christie@xxxxxxxxxx
Tested-by: Nilesh Javali <njavali@xxxxxxxxxxx>
Reviewed-by: Nilesh Javali <njavali@xxxxxxxxxxx>
Signed-off-by: Mike Christie <michael.christie@xxxxxxxxxx>
Signed-off-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/scsi/scsi_transport_iscsi.c b/drivers/scsi/scsi_transport_iscsi.c
index a410d0b8a445..2a38cd2d24ef 100644
--- a/drivers/scsi/scsi_transport_iscsi.c
+++ b/drivers/scsi/scsi_transport_iscsi.c
@@ -2341,6 +2341,55 @@ static void iscsi_cleanup_conn_work_fn(struct work_struct *work)
ISCSI_DBG_TRANS_CONN(conn, "cleanup done.\n");
}
+static int iscsi_iter_force_destroy_conn_fn(struct device *dev, void *data)
+{
+ struct iscsi_transport *transport;
+ struct iscsi_cls_conn *conn;
+
+ if (!iscsi_is_conn_dev(dev))
+ return 0;
+
+ conn = iscsi_dev_to_conn(dev);
+ transport = conn->transport;
+
+ if (READ_ONCE(conn->state) != ISCSI_CONN_DOWN)
+ iscsi_if_stop_conn(conn, STOP_CONN_TERM);
+
+ transport->destroy_conn(conn);
+ return 0;
+}
+
+/**
+ * iscsi_force_destroy_session - destroy a session from the kernel
+ * @session: session to destroy
+ *
+ * Force the destruction of a session from the kernel. This should only be
+ * used when userspace is no longer running during system shutdown.
+ */
+void iscsi_force_destroy_session(struct iscsi_cls_session *session)
+{
+ struct iscsi_transport *transport = session->transport;
+ unsigned long flags;
+
+ WARN_ON_ONCE(system_state == SYSTEM_RUNNING);
+
+ spin_lock_irqsave(&sesslock, flags);
+ if (list_empty(&session->sess_list)) {
+ spin_unlock_irqrestore(&sesslock, flags);
+ /*
+ * Conn/ep is already freed. Session is being torn down via
+ * async path. For shutdown we don't care about it so return.
+ */
+ return;
+ }
+ spin_unlock_irqrestore(&sesslock, flags);
+
+ device_for_each_child(&session->dev, NULL,
+ iscsi_iter_force_destroy_conn_fn);
+ transport->destroy_session(session);
+}
+EXPORT_SYMBOL_GPL(iscsi_force_destroy_session);
+
void iscsi_free_session(struct iscsi_cls_session *session)
{
ISCSI_DBG_TRANS_SESSION(session, "Freeing session\n");
diff --git a/include/scsi/scsi_transport_iscsi.h b/include/scsi/scsi_transport_iscsi.h
index 9acb8422f680..d6eab7cb221a 100644
--- a/include/scsi/scsi_transport_iscsi.h
+++ b/include/scsi/scsi_transport_iscsi.h
@@ -442,6 +442,7 @@ extern struct iscsi_cls_session *iscsi_create_session(struct Scsi_Host *shost,
struct iscsi_transport *t,
int dd_size,
unsigned int target_id);
+extern void iscsi_force_destroy_session(struct iscsi_cls_session *session);
extern void iscsi_remove_session(struct iscsi_cls_session *session);
extern void iscsi_free_session(struct iscsi_cls_session *session);
extern struct iscsi_cls_conn *iscsi_alloc_conn(struct iscsi_cls_session *sess,
