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Date: Fri, 13 Jun 2014 21:23:21 +0300 From: Vicentiu Neagoe <vicentiu.neagoe@...com> To: balbi@...com Cc: linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org, Jeff Westfahl <jeff.westfahl@...com> Subject: [PATCH] usb: gadget: u_ether: synchronize with transmit when stopping queue From: Jeff Westfahl <jeff.westfahl@...com> When disconnecting, it's possible that another thread has already made it into eth_start_xmit before we call netif_stop_queue. This can lead to a crash as eth_start_xmit tries to use resources that gether_disconnect is freeing. Use netif_tx_lock/unlock around netif_stop_queue to ensure no threads are executing during the remainder of gether_disconnect. Signed-off-by: Jeff Westfahl <jeff.westfahl@...com> Tested-by: Jaeden Amero <jaeden.amero@...com> --- drivers/usb/gadget/u_ether.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/usb/gadget/u_ether.c b/drivers/usb/gadget/u_ether.c index b7d4f82..085a76e 100644 --- a/drivers/usb/gadget/u_ether.c +++ b/drivers/usb/gadget/u_ether.c @@ -1120,7 +1120,10 @@ void gether_disconnect(struct gether *link) DBG(dev, "%s\n", __func__); + netif_tx_lock(dev->net); netif_stop_queue(dev->net); + netif_tx_unlock(dev->net); + netif_carrier_off(dev->net); /* disable endpoints, forcing (synchronous) completion -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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