Adding upstream version 6.1.76.upstream/6.1.76

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 54 insertions, 0 deletions

diff --git a/drivers/target/iscsi/iscsi_target_transport.c b/drivers/target/iscsi/iscsi_target_transport.c
new file mode 100644
index 000000000..27c85f260
--- /dev/null
+++ b/drivers/target/iscsi/iscsi_target_transport.c
@@ -0,0 +1,54 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/spinlock.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <target/iscsi/iscsi_transport.h>
+
+static LIST_HEAD(g_transport_list);
+static DEFINE_MUTEX(transport_mutex);
+
+struct iscsit_transport *iscsit_get_transport(int type)
+{
+	struct iscsit_transport *t;
+
+	mutex_lock(&transport_mutex);
+	list_for_each_entry(t, &g_transport_list, t_node) {
+		if (t->transport_type == type) {
+			if (t->owner && !try_module_get(t->owner)) {
+				t = NULL;
+			}
+			mutex_unlock(&transport_mutex);
+			return t;
+		}
+	}
+	mutex_unlock(&transport_mutex);
+
+	return NULL;
+}
+
+void iscsit_put_transport(struct iscsit_transport *t)
+{
+	module_put(t->owner);
+}
+
+void iscsit_register_transport(struct iscsit_transport *t)
+{
+	INIT_LIST_HEAD(&t->t_node);
+
+	mutex_lock(&transport_mutex);
+	list_add_tail(&t->t_node, &g_transport_list);
+	mutex_unlock(&transport_mutex);
+
+	pr_debug("Registered iSCSI transport: %s\n", t->name);
+}
+EXPORT_SYMBOL(iscsit_register_transport);
+
+void iscsit_unregister_transport(struct iscsit_transport *t)
+{
+	mutex_lock(&transport_mutex);
+	list_del(&t->t_node);
+	mutex_unlock(&transport_mutex);
+
+	pr_debug("Unregistered iSCSI transport: %s\n", t->name);
+}
+EXPORT_SYMBOL(iscsit_unregister_transport);