From: Sebastian Andrzej Siewior Date: Wed, 20 Jun 2018 19:31:17 +0000 (+0200) Subject: net: usb: cdc-phonet: use irqsave() in USB's complete callback X-Git-Tag: v4.19~410^2~566^2~4 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=fafa6b10485e4534fcce00a75226caec7f5e2c11;p=platform%2Fkernel%2Flinux-rpi.git 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" Signed-off-by: Sebastian Andrzej Siewior Signed-off-by: David S. Miller --- diff --git a/drivers/net/usb/cdc-phonet.c b/drivers/net/usb/cdc-phonet.c index 288ecd9..3c40312 100644 --- a/drivers/net/usb/cdc-phonet.c +++ b/drivers/net/usb/cdc-phonet.c @@ -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);