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authorDenis ChengRq <crquan@gmail.com>2008-09-23 02:35:37 +0800
committerJohn W. Linville <linville@tuxdriver.com>2008-09-24 16:18:04 -0400
commit638af07386972861272ed9d0cff01cad528fdceb (patch)
tree325176c8c46a7557531b571c1e897170d1073878 /net/wireless
parentacaf908d408ccd49f13aeb46cbd4428a4db174d1 (diff)
downloadlinux-638af07386972861272ed9d0cff01cad528fdceb.tar.bz2
wireless: a global static to local static improvement
There are two improvements in this simple patch: 1. wiphy_counter is a static var only used in one function, so can use local static instead of global static; 2. wiphy_counter wrap handling killed one comparision; Signed-off-by: Denis ChengRq <crquan@gmail.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net/wireless')
-rw-r--r--net/wireless/core.c16
1 files changed, 7 insertions, 9 deletions
diff --git a/net/wireless/core.c b/net/wireless/core.c
index d6940085d59c..5cadbeb76a14 100644
--- a/net/wireless/core.c
+++ b/net/wireless/core.c
@@ -34,7 +34,6 @@ MODULE_DESCRIPTION("wireless configuration support");
* often because we need to do it for each command */
LIST_HEAD(cfg80211_drv_list);
DEFINE_MUTEX(cfg80211_drv_mutex);
-static int wiphy_counter;
/* for debugfs */
static struct dentry *ieee80211_debugfs_dir;
@@ -206,6 +205,8 @@ out_unlock:
struct wiphy *wiphy_new(struct cfg80211_ops *ops, int sizeof_priv)
{
+ static int wiphy_counter;
+
struct cfg80211_registered_device *drv;
int alloc_size;
@@ -222,21 +223,18 @@ struct wiphy *wiphy_new(struct cfg80211_ops *ops, int sizeof_priv)
mutex_lock(&cfg80211_drv_mutex);
- drv->idx = wiphy_counter;
-
- /* now increase counter for the next device unless
- * it has wrapped previously */
- if (wiphy_counter >= 0)
- wiphy_counter++;
-
- mutex_unlock(&cfg80211_drv_mutex);
+ drv->idx = wiphy_counter++;
if (unlikely(drv->idx < 0)) {
+ wiphy_counter--;
+ mutex_unlock(&cfg80211_drv_mutex);
/* ugh, wrapped! */
kfree(drv);
return NULL;
}
+ mutex_unlock(&cfg80211_drv_mutex);
+
/* give it a proper name */
snprintf(drv->wiphy.dev.bus_id, BUS_ID_SIZE,
PHY_NAME "%d", drv->idx);