| From | Hayes Wang <> | Subject | [PATCH net-next v2 05/13] r8152: check tx agg list before spin lock | Date | Wed, 5 Mar 2014 14:49:20 +0800 |
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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> --- 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 8ecb41b..00b3192 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; -- 1.8.4.2
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