qeth: synchronize discipline module loading
During system startup udev may try to configure devices in
parallel so we have to synchronize discipline module
loading.
Signed-off-by: Frank Blaschka <frank.blaschka@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/s390/net/qeth_core_main.c b/drivers/s390/net/qeth_core_main.c
index cbb1018..ef17d83 100644
--- a/drivers/s390/net/qeth_core_main.c
+++ b/drivers/s390/net/qeth_core_main.c
@@ -51,6 +51,7 @@
static struct device *qeth_core_root_dev;
static unsigned int known_devices[][6] = QETH_MODELLIST_ARRAY;
static struct lock_class_key qdio_out_skb_queue_key;
+static struct mutex qeth_mod_mutex;
static void qeth_send_control_data_cb(struct qeth_channel *,
struct qeth_cmd_buffer *);
@@ -5040,6 +5041,7 @@
enum qeth_discipline_id discipline)
{
int rc = 0;
+ mutex_lock(&qeth_mod_mutex);
switch (discipline) {
case QETH_DISCIPLINE_LAYER3:
card->discipline.ccwgdriver = try_then_request_module(
@@ -5057,6 +5059,7 @@
"support discipline %d\n", discipline);
rc = -EINVAL;
}
+ mutex_unlock(&qeth_mod_mutex);
return rc;
}
@@ -5540,6 +5543,7 @@
pr_info("loading core functions\n");
INIT_LIST_HEAD(&qeth_core_card_list.list);
rwlock_init(&qeth_core_card_list.rwlock);
+ mutex_init(&qeth_mod_mutex);
rc = qeth_register_dbf_views();
if (rc)