rtl8xxxu: Simplify locking of a skb list accesses

The 'c2hcmd_lock' spinlock is only used to protect some __skb_queue_tail()
and __skb_dequeue() calls.
Use the lock provided in the skb itself and call skb_queue_tail() and
skb_dequeue(). These functions already include the correct locking.

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/8bcec6429615aeb498482dc7e1955ce09b456585.1617613700.git.christophe.jaillet@wanadoo.fr

diff --git a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu.h b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu.h
index d6d1be4..d1a566c 100644 (file)
--- a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu.h
+++ b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu.h
@@ -1391,7 +1391,6 @@ struct rtl8xxxu_priv {
        struct delayed_work ra_watchdog;
        struct work_struct c2hcmd_work;
        struct sk_buff_head c2hcmd_queue;
-       spinlock_t c2hcmd_lock;
        struct rtl8xxxu_btcoex bt_coex;
        struct rtl8xxxu_ra_report ra_report;
 };

diff --git a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c
index afc9795..9ff09cf 100644 (file)
--- a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c
+++ b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c
@@ -5423,7 +5423,6 @@ static void rtl8xxxu_c2hcmd_callback(struct work_struct *work)
        struct rtl8xxxu_priv *priv;
        struct rtl8723bu_c2h *c2h;
        struct sk_buff *skb = NULL;
-       unsigned long flags;
        u8 bt_info = 0;
        struct rtl8xxxu_btcoex *btcoex;
        struct rtl8xxxu_ra_report *rarpt;
@@ -5439,9 +5438,7 @@ static void rtl8xxxu_c2hcmd_callback(struct work_struct *work)
                goto out;
 
        while (!skb_queue_empty(&priv->c2hcmd_queue)) {
-               spin_lock_irqsave(&priv->c2hcmd_lock, flags);
-               skb = __skb_dequeue(&priv->c2hcmd_queue);
-               spin_unlock_irqrestore(&priv->c2hcmd_lock, flags);
+               skb = skb_dequeue(&priv->c2hcmd_queue);
 
                c2h = (struct rtl8723bu_c2h *)skb->data;
 
@@ -5499,7 +5496,6 @@ static void rtl8723bu_handle_c2h(struct rtl8xxxu_priv *priv,
        struct rtl8723bu_c2h *c2h = (struct rtl8723bu_c2h *)skb->data;
        struct device *dev = &priv->udev->dev;
        int len;
-       unsigned long flags;
 
        len = skb->len - 2;
 
@@ -5538,9 +5534,7 @@ static void rtl8723bu_handle_c2h(struct rtl8xxxu_priv *priv,
                break;
        }
 
-       spin_lock_irqsave(&priv->c2hcmd_lock, flags);
-       __skb_queue_tail(&priv->c2hcmd_queue, skb);
-       spin_unlock_irqrestore(&priv->c2hcmd_lock, flags);
+       skb_queue_tail(&priv->c2hcmd_queue, skb);
 
        schedule_work(&priv->c2hcmd_work);
 }
@@ -6606,7 +6600,6 @@ static int rtl8xxxu_probe(struct usb_interface *interface,
        spin_lock_init(&priv->rx_urb_lock);
        INIT_WORK(&priv->rx_urb_wq, rtl8xxxu_rx_urb_work);
        INIT_DELAYED_WORK(&priv->ra_watchdog, rtl8xxxu_watchdog_callback);
-       spin_lock_init(&priv->c2hcmd_lock);
        INIT_WORK(&priv->c2hcmd_work, rtl8xxxu_c2hcmd_callback);
        skb_queue_head_init(&priv->c2hcmd_queue);