[PATCH] mwifiex: Replace semaphore async_sem with mutex

[Binoy Jayan]

The semaphore 'async_sem' is used as a simple mutex, so
it should be written as one. Semaphores are going away in the future.

Signed-off-by: Binoy Jayan <binoy.ja...@linaro.org>
---

This patch is part of a bigger effort to eliminate unwanted
semaphores from the linux kernel.

 drivers/net/wireless/marvell/mwifiex/cfg80211.c | 2 +-
 drivers/net/wireless/marvell/mwifiex/main.h     | 2 +-
 drivers/net/wireless/marvell/mwifiex/scan.c     | 4 ++--
 3 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/net/wireless/marvell/mwifiex/cfg80211.c 
b/drivers/net/wireless/marvell/mwifiex/cfg80211.c
index 7ec06bf..9e0d638 100644
--- a/drivers/net/wireless/marvell/mwifiex/cfg80211.c
+++ b/drivers/net/wireless/marvell/mwifiex/cfg80211.c
@@ -3059,7 +3059,7 @@ struct wireless_dev *mwifiex_add_virtual_intf(struct 
wiphy *wiphy,
        INIT_DELAYED_WORK(&priv->dfs_chan_sw_work,
                          mwifiex_dfs_chan_sw_work_queue);
 
-       sema_init(&priv->async_sem, 1);
+       mutex_init(&priv->async_mutex);
 
        mwifiex_dbg(adapter, INFO,
                    "info: %s: Marvell 802.11 Adapter\n", dev->name);
diff --git a/drivers/net/wireless/marvell/mwifiex/main.h 
b/drivers/net/wireless/marvell/mwifiex/main.h
index bb2a467..9c2cb33 100644
--- a/drivers/net/wireless/marvell/mwifiex/main.h
+++ b/drivers/net/wireless/marvell/mwifiex/main.h
@@ -628,7 +628,7 @@ struct mwifiex_private {
        struct dentry *dfs_dev_dir;
 #endif
        u16 current_key_index;
-       struct semaphore async_sem;
+       struct mutex async_mutex;
        struct cfg80211_scan_request *scan_request;
        u8 cfg_bssid[6];
        struct wps wps;
diff --git a/drivers/net/wireless/marvell/mwifiex/scan.c 
b/drivers/net/wireless/marvell/mwifiex/scan.c
index ce6936d..ae9630b 100644
--- a/drivers/net/wireless/marvell/mwifiex/scan.c
+++ b/drivers/net/wireless/marvell/mwifiex/scan.c
@@ -2809,7 +2809,7 @@ int mwifiex_request_scan(struct mwifiex_private *priv,
 {
        int ret;
 
-       if (down_interruptible(&priv->async_sem)) {
+       if (mutex_lock_interruptible(&priv->async_mutex)) {
                mwifiex_dbg(priv->adapter, ERROR,
                            "%s: acquire semaphore fail\n",
                            __func__);
@@ -2825,7 +2825,7 @@ int mwifiex_request_scan(struct mwifiex_private *priv,
                /* Normal scan */
                ret = mwifiex_scan_networks(priv, NULL);
 
-       up(&priv->async_sem);
+       mutex_unlock(&priv->async_mutex);
 
        return ret;
 }
-- 
Binoy Jayan