From 21949ab7df0d78b575c87c2e70192b487fd37511 Mon Sep 17 00:00:00 2001 From: hayeswang Date: Fri, 7 Mar 2014 11:04:35 +0800 Subject: [PATCH] r8152: check tx agg list before spin lock Check tx agg list before spin lock to avoid doing spin lock every times. Signed-off-by: Hayes Wang Signed-off-by: David S. Miller --- drivers/net/usb/r8152.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/net/usb/r8152.c b/drivers/net/usb/r8152.c index 8ecb41b2df09..00b3192568fe 100644 --- a/drivers/net/usb/r8152.c +++ b/drivers/net/usb/r8152.c @@ -1266,6 +1266,9 @@ static struct tx_agg *r8152_get_tx_agg(struct r8152 *tp) struct tx_agg *agg = NULL; unsigned long flags; + if (list_empty(&tp->tx_free)) + return NULL; + spin_lock_irqsave(&tp->tx_lock, flags); if (!list_empty(&tp->tx_free)) { struct list_head *cursor; -- 2.11.0