From: Ben Greear <greearb@candelatech.com>
To: Eric Dumazet <eric.dumazet@gmail.com>
Cc: David Miller <davem@davemloft.net>,
netdev <netdev@vger.kernel.org>,
"K. Y. Srinivasan" <kys@microsoft.com>,
Haiyang Zhang <haiyangz@microsoft.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Subject: Re: [PATCH] net/hyperv: fix erroneous NETDEV_TX_BUSY use
Date: Wed, 14 Mar 2012 11:56:55 -0700 [thread overview]
Message-ID: <4F60E9F7.4000402@candelatech.com> (raw)
In-Reply-To: <1331751214.6022.47.camel@edumazet-glaptop>
On 03/14/2012 11:53 AM, Eric Dumazet wrote:
> A driver start_xmit() method cannot free skb and return NETDEV_TX_BUSY,
> since caller is going to reuse freed skb.
>
> This is mostly a revert of commit bf769375c (staging: hv: fix the return
> status of netvsc_start_xmit())
>
> In fact netif_tx_stop_queue() / netif_stop_queue() is needed before
> returning NETDEV_TX_BUSY or you can trigger a ksoftirqd fatal loop.
>
> In case of memory allocation error, only safe way is to drop the packet
> and return NETDEV_TX_OK
Can you not just leave the skb alone, not bump any tx-dropped
stats, and return NETDEV_TX_BUSY?
Been a while since I looked at this code however...
Ben
--
Ben Greear <greearb@candelatech.com>
Candela Technologies Inc http://www.candelatech.com
next prev parent reply other threads:[~2012-03-14 18:57 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-14 18:53 [PATCH] net/hyperv: fix erroneous NETDEV_TX_BUSY use Eric Dumazet
2012-03-14 18:56 ` Ben Greear [this message]
2012-03-14 19:17 ` Eric Dumazet
2012-03-14 20:00 ` Haiyang Zhang
2012-03-14 20:14 ` Eric Dumazet
2012-03-14 20:29 ` Haiyang Zhang
2012-03-16 9:02 ` David Miller
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