linux-kernel - Re: [PATCH 2/3] vhost: initialize log eventfd context pointer

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Date:	Tue, 23 Feb 2010 20:31:11 +0100
From:	Juan Quintela <quintela@...hat.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	Rusty Russell <rusty@...tcorp.com.au>, kvm@...r.kernel.org,
	virtualization@...ts.osdl.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, David Miller <davem@...emloft.net>,
	markmc@...hat.com, gleb@...hat.com, herbert.xu@...hat.com,
	dlaor@...hat.com, avi@...hat.com
Subject: Re: [PATCH 2/3] vhost: initialize log eventfd context pointer

"Michael S. Tsirkin" <mst@...hat.com> wrote:
> vq log eventfd context pointer needs to be initialized, otherwise
> operation may fail or oops if log is enabled but log eventfd not set by
> userspace.
>
> Signed-off-by: Michael S. Tsirkin <mst@...hat.com>

Reviewed-by: Juan Quintela <quintela@...hat.com>

When log_ctx for device is created, it is copied to the vq.  This reset
was missing.

> ---
>  drivers/vhost/vhost.c |    1 +
>  1 files changed, 1 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
> index c767279..d4f8fdf 100644
> --- a/drivers/vhost/vhost.c
> +++ b/drivers/vhost/vhost.c
> @@ -121,6 +121,7 @@ static void vhost_vq_reset(struct vhost_dev *dev,
>  	vq->kick = NULL;
>  	vq->call_ctx = NULL;
>  	vq->call = NULL;
> +	vq->log_ctx = NULL;
>  }
>  
>  long vhost_dev_init(struct vhost_dev *dev,
--
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