linux-kernel - Re: [Xen-devel] [PATCH 2/4] drivers/xen/xenbus/xenbus_client.c: Correct the comments for xenbus_grant

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Date:	Mon, 15 Sep 2014 16:27:53 +0100
From:	David Vrabel <david.vrabel@...rix.com>
To:	Chen Gang <gang.chen.5i5j@...il.com>, <konrad.wilk@...cle.com>,
	<boris.ostrovsky@...cle.com>,
	David Vrabel <david.vrabel@...rix.com>,
	<stefano.stabellini@...citrix.com>, <mukesh.rathor@...cle.com>
CC:	<xen-devel@...ts.xenproject.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [Xen-devel] [PATCH 2/4] drivers/xen/xenbus/xenbus_client.c: Correct
 the comments for xenbus_grant_ring()

On 14/09/14 11:50, Chen Gang wrote:
> Both zero and positive number can indicate success, so the original
> comments need be improved.
> 
> Signed-off-by: Chen Gang <gang.chen.5i5j@...il.com>
> ---
>  drivers/xen/xenbus/xenbus_client.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/xen/xenbus/xenbus_client.c b/drivers/xen/xenbus/xenbus_client.c
> index 277e74d..e2cf681 100644
> --- a/drivers/xen/xenbus/xenbus_client.c
> +++ b/drivers/xen/xenbus/xenbus_client.c
> @@ -361,8 +361,8 @@ static void xenbus_switch_fatal(struct xenbus_device *dev, int depth, int err,
>   * @ring_mfn: mfn of ring to grant
>  
>   * Grant access to the given @ring_mfn to the peer of the given device.  Return
> - * 0 on success, or -errno on error.  On error, the device will switch to
> - * XenbusStateClosing, and the error will be saved in the store.
> + * 0 or positive number on success, or -errno on error.  On error, the device
> + * will switch to XenbusStateClosing, and the error will be saved in the store.

If you're going to update this comment, please state what it is actually
returning: i.e., a grant reference or -ve on error.

David
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