Re: [Xen-devel] [Xen PATCH] xen-netback: fix error handling output

[Juergen Gross <jgross@xxxxxxxx>]

On 08/11/16 14:34, Arnd Bergmann wrote:
> The connect function prints an unintialized error code after an
> earlier initialization was removed:
> 
> drivers/net/xen-netback/xenbus.c: In function 'connect':
> drivers/net/xen-netback/xenbus.c:938:3: error: 'err' may be used 
> uninitialized in this function [-Werror=maybe-uninitialized]
> 
> This prints it as -EINVAL instead, which seems to be the most
> appropriate error code. Before the patch that caused the warning,
> this would print a positive number returned by vsscanf() instead,
> which is also wrong. We probably don't need a backport though,
> as fixing the warning here should be sufficient.
> 
> Fixes: f95842e7a9f2 ("xen: make use of xenbus_read_unsigned() in xen-netback")
> Fixes: 8d3d53b3e433 ("xen-netback: Add support for multiple queues")
> Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>

Applied to xen/tip.git for-linus-4.10


Thanks,

Juergen

> ---
>  drivers/net/xen-netback/xenbus.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/xen-netback/xenbus.c 
> b/drivers/net/xen-netback/xenbus.c
> index 7356e00fac54..bfed79877b8a 100644
> --- a/drivers/net/xen-netback/xenbus.c
> +++ b/drivers/net/xen-netback/xenbus.c
> @@ -935,7 +935,7 @@ static void connect(struct backend_info *be)
>                                       "multi-queue-num-queues", 1);
>       if (requested_num_queues > xenvif_max_queues) {
>               /* buggy or malicious guest */
> -             xenbus_dev_fatal(dev, err,
> +             xenbus_dev_fatal(dev, -EINVAL,
>                                "guest requested %u queues, exceeding the 
> maximum of %u.",
>                                requested_num_queues, xenvif_max_queues);
>               return;
> 


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