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qeth: synchronize discipline module loading

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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>
This commit is contained in:
Frank Blaschka 2012-03-07 02:06:25 +00:00 committed by David S. Miller
parent 82492a355f
commit 2022e00cd5
1 changed files with 4 additions and 0 deletions
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4
drivers/s390/net/qeth_core_main.c
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@ -51,6 +51,7 @@ static struct kmem_cache *qeth_qdio_outbuf_cache;
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 @@ int qeth_core_load_discipline(struct qeth_card *card,
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 @@ int qeth_core_load_discipline(struct qeth_card *card,
"support discipline %d\n", discipline);
rc = -EINVAL;
}
mutex_unlock(&qeth_mod_mutex);
return rc;
}
@ -5540,6 +5543,7 @@ static int __init qeth_core_init(void)
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)