linux-kernel - [PATCH] usb gadget: fix race between eth_open() and gen_ndis_set

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Date:	Wed, 15 Feb 2012 17:40:06 +0800
From:	Yong Zhang <yong.zhang0@...il.com>
To:	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:	Felipe Balbi <balbi@...com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: [PATCH] usb gadget: fix race between eth_open() and gen_ndis_set_resp()

In such a scenario:
static int gen_ndis_set_resp()
{
	...
        switch (OID) {
	        case OID_GEN_CURRENT_PACKET_FILTER:
		...
		if (*params->filter) {
			...
		} else {
                        params->state = RNDIS_INITIALIZED;
			netif_carrier_off(params->dev);
			netif_stop_queue(params->dev);      <=== A
		}
}

After A is finished, if someone call 'ifconfig usb0 *.*.*.*',
usb0 will never go up because eth_open() fail to call eth_start();

Fix it by calling eth_start() unconditionally in eth_open().

Signed-off-by: Yong Zhang <yong.zhang0@...il.com>
Cc: Felipe Balbi <balbi@...com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/usb/gadget/u_ether.c |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/gadget/u_ether.c b/drivers/usb/gadget/u_ether.c
index 29c854b..a1a666f 100644
--- a/drivers/usb/gadget/u_ether.c
+++ b/drivers/usb/gadget/u_ether.c
@@ -640,8 +640,7 @@ static int eth_open(struct net_device *net)
 	struct gether	*link;
 
 	DBG(dev, "%s\n", __func__);
-	if (netif_carrier_ok(dev->net))
-		eth_start(dev, GFP_KERNEL);
+	eth_start(dev, GFP_KERNEL);
 
 	spin_lock_irq(&dev->lock);
 	link = dev->port_usb;
-- 
1.7.5.4

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