linux-kernel - Re: [PATCH] xen/pvcalls-back: test for errors when calling backend

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Date:   Mon, 11 May 2020 14:41:50 -0700 (PDT)
From:   Stefano Stabellini <sstabellini@...nel.org>
To:     Juergen Gross <jgross@...e.com>
cc:     xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        stable@...r.kernel.org
Subject: Re: [PATCH] xen/pvcalls-back: test for errors when calling
 backend_connect()

On Mon, 11 May 2020, Juergen Gross wrote:
> backend_connect() can fail, so switch the device to connected only if
> no error occurred.
> 
> Fixes: 0a9c75c2c7258f2 ("xen/pvcalls: xenbus state handling")
> Cc: stable@...r.kernel.org
> Signed-off-by: Juergen Gross <jgross@...e.com>

Reviewed-by: Stefano Stabellini <sstabellini@...nel.org>


> ---
>  drivers/xen/pvcalls-back.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/xen/pvcalls-back.c b/drivers/xen/pvcalls-back.c
> index cf4ce3e9358d..41a18ece029a 100644
> --- a/drivers/xen/pvcalls-back.c
> +++ b/drivers/xen/pvcalls-back.c
> @@ -1088,7 +1088,8 @@ static void set_backend_state(struct xenbus_device *dev,
>  		case XenbusStateInitialised:
>  			switch (state) {
>  			case XenbusStateConnected:
> -				backend_connect(dev);
> +				if (backend_connect(dev))
> +					return;

Do you think it would make sense to WARN?

>  				xenbus_switch_state(dev, XenbusStateConnected);
>  				break;
>  			case XenbusStateClosing:
> -- 
> 2.26.1
>