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i40iw: Receive notification events correctly 

Device notifications are not received after the first interface is
closed; since there is an unregister for notifications on every
interface close. Correct this by unregistering for device
notifications only when the last interface is closed. Also, make
all operations on the i40iw_notifiers_registered atomic as it
can be read/modified concurrently.

Fixes: 8e06af711b ("i40iw: add main, hdr, status")

Signed-off-by: Mustafa Ismail <mustafa.ismail@intel.com>
Signed-off-by: Shiraz Saleem <shiraz.saleem@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Shiraz Saleem 2016-08-25 11:53:24 -05:00 committed by Doug Ledford
parent 866e0f4d73
commit b71121b4b7
1 changed files with 3 additions and 5 deletions
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8
drivers/infiniband/hw/i40iw/i40iw_main.c
View File

@ -100,7 +100,7 @@ static struct notifier_block i40iw_net_notifier = {
.notifier_call = i40iw_net_event
};
static int i40iw_notifiers_registered;
static atomic_t i40iw_notifiers_registered;
/**
* i40iw_find_i40e_handler - find a handler given a client info
@ -1342,12 +1342,11 @@ static enum i40iw_status_code i40iw_initialize_dev(struct i40iw_device *iwdev,
*/
static void i40iw_register_notifiers(void)
{
if (!i40iw_notifiers_registered) {
if (atomic_inc_return(&i40iw_notifiers_registered) == 1) {
register_inetaddr_notifier(&i40iw_inetaddr_notifier);
register_inet6addr_notifier(&i40iw_inetaddr6_notifier);
register_netevent_notifier(&i40iw_net_notifier);
}
i40iw_notifiers_registered++;
}
/**
@ -1429,8 +1428,7 @@ static void i40iw_deinit_device(struct i40iw_device *iwdev, bool reset, bool del
i40iw_del_macip_entry(iwdev, (u8)iwdev->mac_ip_table_idx);
/* fallthrough */
case INET_NOTIFIER:
if (i40iw_notifiers_registered > 0) {
i40iw_notifiers_registered--;
if (!atomic_dec_return(&i40iw_notifiers_registered)) {
unregister_netevent_notifier(&i40iw_net_notifier);
unregister_inetaddr_notifier(&i40iw_inetaddr_notifier);
unregister_inet6addr_notifier(&i40iw_inetaddr6_notifier);