From: hayeswang <hayeswang@realtek.com>
Date: Fri, 7 Mar 2014 03:04:35 +0000 (+0800)
Subject: r8152: check tx agg list before spin lock
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=21949ab7df0d78b575c87c2e70192b487fd37511;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git

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 <hayeswang@realtek.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

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;