From: Bjørn Mork Date: Fri, 16 May 2014 19:48:29 +0000 (+0200) Subject: net: cdc_ncm: do not start timer on an empty skb X-Git-Tag: v4.14-rc1~7383^2~198^2 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=046c65946e3d1bbc70282f43c9cd39b1d430640b;p=platform%2Fkernel%2Flinux-rpi.git net: cdc_ncm: do not start timer on an empty skb We can end up with a freshly allocated tx_curr_skb with no frames in it. In this case it does not make any sense to start the timer. This avoids the timer periodically trying to start tx when there is nothing in the queue. Signed-off-by: Bjørn Mork Signed-off-by: David S. Miller --- diff --git a/drivers/net/usb/cdc_ncm.c b/drivers/net/usb/cdc_ncm.c index 783c4ed..2d0caf1 100644 --- a/drivers/net/usb/cdc_ncm.c +++ b/drivers/net/usb/cdc_ncm.c @@ -1069,8 +1069,8 @@ cdc_ncm_fill_tx_frame(struct usbnet *dev, struct sk_buff *skb, __le32 sign) return skb_out; exit_no_skb: - /* Start timer, if there is a remaining skb */ - if (ctx->tx_curr_skb != NULL) + /* Start timer, if there is a remaining non-empty skb */ + if (ctx->tx_curr_skb != NULL && n > 0) cdc_ncm_tx_timeout_start(ctx); return NULL; }