linux-kernel - Re: [PATCH] xen/xenbus: Use 'void' instead of 'int' for the return of xenbus_switch

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Date:	Mon, 29 Sep 2014 07:35:45 -0600
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	Chen Gang <gang.chen.5i5j@...il.com>
Cc:	David Vrabel <david.vrabel@...rix.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Ian Campbell <ian.campbell@...rix.com>, wei.liu2@...rix.com,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>, jgross@...e.com,
	Wei Yongjun <yongjun_wei@...ndmicro.com.cn>,
	mukesh.rathor@...cle.com,
	"xen-devel@...ts.xenproject.org" <xen-devel@...ts.xenproject.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] xen/xenbus: Use 'void' instead of 'int' for the return of xenbus_switch_state()

On Fri, Sep 26, 2014 at 10:36 AM, Chen Gang <gang.chen.5i5j@...il.com> wrote:
> When xenbus_switch_state() fails, it will call xenbus_switch_fatal()
> internally, so need not return any status value, then use 'void' instead
> of 'int' for xenbus_switch_state() and __xenbus_switch_state().
>
> Also need be sure that all callers which check the return value must let
> 'err' be 0.
>
> And also need change the related comments for xenbus_switch_state().
>
> Signed-off-by: Chen Gang <gang.chen.5i5j@...il.com>
> ---
>  drivers/block/xen-blkback/xenbus.c |  9 ++-------
>  drivers/net/xen-netback/xenbus.c   |  5 +----
>  drivers/pci/xen-pcifront.c         | 15 ++++++---------
>  drivers/xen/xen-pciback/xenbus.c   | 21 ++++-----------------
>  drivers/xen/xen-scsiback.c         |  5 +----
>  drivers/xen/xenbus/xenbus_client.c | 16 ++++++++--------
>  include/xen/xenbus.h               |  3 ++-
>  7 files changed, 24 insertions(+), 50 deletions(-)

I don't know enough to review this, but as far as I'm concerned, the
Xen folks own drivers/pci/xen-pcifront.c, so whatever they want to do
is fine with me.

Bjorn
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