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cfg80211: use atomic_t for wiphy counter

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There's no need to lock, we can just use an atomic_t.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Johannes Berg 2013-05-08 21:49:02 +02:00
parent 9f419f3851
commit 73810b77de
1 changed files with 3 additions and 8 deletions
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11
net/wireless/core.c
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@ -289,7 +289,7 @@ static void cfg80211_event_work(struct work_struct *work)
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 @@ struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv)
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);