Re: [PATCH] net/hyperv: fix erroneous NETDEV_TX_BUSY use

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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@xxxxxxxxxxxxxxx>
Candela Technologies Inc  http://www.candelatech.com

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