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r8152: check tx agg list before spin lock

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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>
This commit is contained in:
hayeswang 2014-03-07 11:04:35 +08:00 committed by David S. Miller
parent 2685d41063
commit 21949ab7df
1 changed files with 3 additions and 0 deletions
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3
drivers/net/usb/r8152.c
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@ -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;