linux-kernel - Re: [PATCH] xen-netback: corretly check failed allocation

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Message-ID: <20151015171301.GB5541@zion.uk.xensource.com>
Date:	Thu, 15 Oct 2015 18:13:02 +0100
From:	Wei Liu <wei.liu2@...rix.com>
To:	Insu Yun <wuninsu@...il.com>
CC:	<ian.campbell@...rix.com>, <wei.liu2@...rix.com>,
	<xen-devel@...ts.xenproject.org>, <netdev@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <taesoo@...ech.edu>,
	<yeongjin.jang@...ech.edu>, <insu@...ech.edu>
Subject: Re: [PATCH] xen-netback: corretly check failed allocation

On Thu, Oct 15, 2015 at 12:26:16PM -0400, Insu Yun wrote:
> Since vzalloc can be failed in memory pressure,
> return value should be checked and return ENOMEM.

This function doesn't return ENOMEM, instead it writes to xenstore to
indicate error. The commit log needs to be updated.

> 
> Signed-off-by: Insu Yun <wuninsu@...il.com>
> ---
>  drivers/net/xen-netback/xenbus.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/net/xen-netback/xenbus.c b/drivers/net/xen-netback/xenbus.c
> index 929a6e7..e288246 100644
> --- a/drivers/net/xen-netback/xenbus.c
> +++ b/drivers/net/xen-netback/xenbus.c
> @@ -788,6 +788,11 @@ static void connect(struct backend_info *be)
>  	/* Use the number of queues requested by the frontend */
>  	be->vif->queues = vzalloc(requested_num_queues *
>  				  sizeof(struct xenvif_queue));
> +  if (!be->vif->queues)  {
> +    xenbus_dev_fatal(dev, -ENOMEM, "allocating queues");
> +    return;
> +  }
> +

The indentation is wrong. Please configure your email client properly.

And please use "goto err" for error handling -- yes, I understand there
is existing code that returns directly but IMHO that should be fixed
too.

We.

>  	be->vif->num_queues = requested_num_queues;
>  	be->vif->stalled_queues = requested_num_queues;
>  
> -- 
> 1.9.1
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