cfg80211: use atomic_t for wiphy counter
There's no need to lock, we can just use an atomic_t.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
diff --git a/net/wireless/core.c b/net/wireless/core.c
index cc49cf1..9416b8f 100644
--- a/net/wireless/core.c
+++ b/net/wireless/core.c
@@ -289,7 +289,7 @@
struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv)
{
- static int wiphy_counter;
+ static atomic_t wiphy_counter = ATOMIC_INIT(0);
struct cfg80211_registered_device *rdev;
int alloc_size;
@@ -311,20 +311,15 @@
rdev->ops = ops;
- mutex_lock(&cfg80211_mutex);
-
- rdev->wiphy_idx = wiphy_counter++;
+ rdev->wiphy_idx = atomic_inc_return(&wiphy_counter);
if (unlikely(rdev->wiphy_idx < 0)) {
- wiphy_counter--;
- mutex_unlock(&cfg80211_mutex);
/* ugh, wrapped! */
+ atomic_dec(&wiphy_counter);
kfree(rdev);
return NULL;
}
- mutex_unlock(&cfg80211_mutex);
-
/* give it a proper name */
dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);