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net: usb: cdc-phonet: use irqsave() in USB's complete callback 

The USB completion callback does not disable interrupts while acquiring
the lock. We want to remove the local_irq_disable() invocation from
__usb_hcd_giveback_urb() and therefore it is required for the callback
handler to disable the interrupts while acquiring the lock.
The callback may be invoked either in IRQ or BH context depending on the
USB host controller.
Use the _irqsave() variant of the locking primitives.

Cc: "David S. Miller" <davem@davemloft.net>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Sebastian Andrzej Siewior 2018-06-20 21:31:17 +02:00 committed by David S. Miller
parent f79e7115bd
commit fafa6b1048
1 changed files with 3 additions and 2 deletions
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5
drivers/net/usb/cdc-phonet.c
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@ -99,6 +99,7 @@ static void tx_complete(struct urb *req)
struct net_device *dev = skb->dev;
struct usbpn_dev *pnd = netdev_priv(dev);
int status = req->status;
unsigned long flags;
switch (status) {
case 0:
@ -115,10 +116,10 @@ static void tx_complete(struct urb *req)
}
dev->stats.tx_packets++;
spin_lock(&pnd->tx_lock);
spin_lock_irqsave(&pnd->tx_lock, flags);
pnd->tx_queue--;
netif_wake_queue(dev);
spin_unlock(&pnd->tx_lock);
spin_unlock_irqrestore(&pnd->tx_lock, flags);
dev_kfree_skb_any(skb);
usb_free_urb(req);