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r8152: check tx agg list before spin lock
author
hayeswang
<hayeswang@realtek.com>
Fri, 7 Mar 2014 03:04:35 +0000
(11:04 +0800)
committer
David S. Miller
<davem@davemloft.net>
Fri, 7 Mar 2014 21:24:28 +0000
(16:24 -0500)
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>
drivers/net/usb/r8152.c
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diff --git
a/drivers/net/usb/r8152.c
b/drivers/net/usb/r8152.c
index
8ecb41b
..
00b3192
100644
(file)
--- 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;