netdev - Re: [PATCH net] xen-netback: clear vif->task on disconnect

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Message-ID: <529DCD42.4070702@cogentembedded.com>
Date:	Tue, 03 Dec 2013 16:23:30 +0400
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Paul Durrant <paul.durrant@...rix.com>, xen-devel@...ts.xen.org,
	netdev@...r.kernel.org
CC:	Wei Liu <wei.liu2@...rix.com>,
	Ian Campbell <ian.campbell@...rix.com>,
	David Vrabel <david.vrabel@...rix.com>
Subject: Re: [PATCH net] xen-netback: clear vif->task on disconnect

Hello.

On 03-12-2013 13:53, Paul Durrant wrote:

> xenvif_start_xmit() relies on checking vif->task for NULL to determine
> whether the vif is ready to accept packets. The task thread is stopped in
> xenvif_disconnect() but task is not set to NULL. Thus, on a re-connect the
> check will give a false positive.
> Also since commit ea732dff5cfa10789007bf4a5b935388a0bb2a8f it should not

    Please also specify that commit's summary line in parens.

> be possible for xenvif_connect() to be called if the vif is already connected
> so change the check of vif->tx_irq to a BUG_ON() and also add a
> BUG_ON(vif->task).

> Signed-off-by: Paul Durrant <paul.durrant@...rix.com>
> Cc: Wei Liu <wei.liu2@...rix.com>
> Cc: Ian Campbell <ian.campbell@...rix.com>
> Cc: David Vrabel <david.vrabel@...rix.com>

WBR, Sergei

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