staging: wilc1000: use mutex instead of struct semaphore hif_sema_deinit

This patch replaces struct semaphore hif_sema_deinit with struct mutex
hif_deinit_lock. It is better to use mutex because mutex gives better
performance than semaphore.

Signed-off-by: Chaehyun Lim <chaehyun.lim@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/wilc1000/host_interface.c b/drivers/staging/wilc1000/host_interface.c
index 4be8b31..b1ffa91 100644 (file)
--- a/drivers/staging/wilc1000/host_interface.c
+++ b/drivers/staging/wilc1000/host_interface.c
@@ -234,7 +234,7 @@ static struct message_queue hif_msg_q;
 static struct semaphore hif_sema_thread;
 static struct semaphore hif_sema_driver;
 static struct completion hif_wait_response;
-static struct semaphore hif_sema_deinit;
+static struct mutex hif_deinit_lock;
 static struct timer_list periodic_rssi;
 
 u8 wilc_multicast_mac_addr_list[WILC_MULTICAST_TABLE_SIZE][ETH_ALEN];
@@ -3402,7 +3402,7 @@ int wilc_init(struct net_device *dev, struct host_if_drv **hif_drv_handler)
        if (clients_count == 0) {
                sema_init(&hif_sema_thread, 0);
                sema_init(&hif_sema_driver, 0);
-               sema_init(&hif_sema_deinit, 1);
+               mutex_init(&hif_deinit_lock);
        }
 
        init_completion(&hif_drv->comp_test_key_block);
@@ -3470,7 +3470,7 @@ int wilc_deinit(struct wilc_vif *vif)
                return -EFAULT;
        }
 
-       down(&hif_sema_deinit);
+       mutex_lock(&hif_deinit_lock);
 
        terminated_handle = hif_drv;
 
@@ -3512,7 +3512,7 @@ int wilc_deinit(struct wilc_vif *vif)
 
        clients_count--;
        terminated_handle = NULL;
-       up(&hif_sema_deinit);
+       mutex_unlock(&hif_deinit_lock);
        return result;
 }
 
@@ -3559,25 +3559,25 @@ void wilc_gnrl_async_info_received(struct wilc *wilc, u8 *pu8Buffer,
        struct host_if_drv *hif_drv = NULL;
        struct wilc_vif *vif;
 
-       down(&hif_sema_deinit);
+       mutex_lock(&hif_deinit_lock);
 
        id = ((pu8Buffer[u32Length - 4]) | (pu8Buffer[u32Length - 3] << 8) | (pu8Buffer[u32Length - 2] << 16) | (pu8Buffer[u32Length - 1] << 24));
        vif = wilc_get_vif_from_idx(wilc, id);
        if (!vif) {
-               up(&hif_sema_deinit);
+               mutex_unlock(&hif_deinit_lock);
                return;
        }
 
        hif_drv = vif->hif_drv;
 
        if (!hif_drv || hif_drv == terminated_handle) {
-               up(&hif_sema_deinit);
+               mutex_unlock(&hif_deinit_lock);
                return;
        }
 
        if (!hif_drv->usr_conn_req.conn_result) {
                netdev_err(vif->ndev, "there is no current Connect Request\n");
-               up(&hif_sema_deinit);
+               mutex_unlock(&hif_deinit_lock);
                return;
        }
 
@@ -3594,7 +3594,7 @@ void wilc_gnrl_async_info_received(struct wilc *wilc, u8 *pu8Buffer,
        if (result)
                netdev_err(vif->ndev, "synchronous info (%d)\n", result);
 
-       up(&hif_sema_deinit);
+       mutex_unlock(&hif_deinit_lock);
 }
 
 void wilc_scan_complete_received(struct wilc *wilc, u8 *pu8Buffer,