linux-kernel - RE: [PATCH 1/3] hv: hv_util: move vmbus

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Date:	Fri, 30 Jan 2015 04:26:44 +0000
From:	Dexuan Cui <decui@...rosoft.com>
To:	Vitaly Kuznetsov <vkuznets@...hat.com>
CC:	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"driverdev-devel@...uxdriverproject.org" 
	<driverdev-devel@...uxdriverproject.org>,
	"olaf@...fle.de" <olaf@...fle.de>,
	"apw@...onical.com" <apw@...onical.com>,
	"jasowang@...hat.com" <jasowang@...hat.com>,
	KY Srinivasan <kys@...rosoft.com>,
	Haiyang Zhang <haiyangz@...rosoft.com>
Subject: RE: [PATCH 1/3] hv: hv_util: move vmbus_open() to a later place

> -----Original Message-----
> From: Vitaly Kuznetsov [mailto:vkuznets@...hat.com]
> Sent: Thursday, January 29, 2015 21:13 PM
> To: Dexuan Cui
> Cc: gregkh@...uxfoundation.org; linux-kernel@...r.kernel.org; driverdev-
> devel@...uxdriverproject.org; olaf@...fle.de; apw@...onical.com;
> jasowang@...hat.com; KY Srinivasan; Haiyang Zhang
> Subject: Re: [PATCH 1/3] hv: hv_util: move vmbus_open() to a later place
> 
> Dexuan Cui <decui@...rosoft.com> writes:
> 
> > Before the line vmbus_open() returns, srv->util_cb can be already running
> > and the variablies, like util_fw_version, are needed by the srv->util_cb.
> >
> > So we have to make sure the variables are initialized before the vmbus_open().
> >
> > CC: "K. Y. Srinivasan" <kys@...rosoft.com>
> > Signed-off-by: Dexuan Cui <decui@...rosoft.com>
> 
> It is not said in the description but moving hv_set_drvdata() before
> vmbus_open() make sense in case probe and remove can collide (can
> they?).
I'm not so sure. In normal usages, the collision should be unlikely.
Anyway, the patch makes things better. :-)

> 
> Reviewed-by: Vitaly Kuznetsov <vkuznets@...hat.com>
Thanks for the review!

Thanks,
-- Dexuan

> > ---
> >  drivers/hv/hv_util.c | 11 ++++++-----
> >  1 file changed, 6 insertions(+), 5 deletions(-)
> >
> > diff --git a/drivers/hv/hv_util.c b/drivers/hv/hv_util.c
> > index 3b9c9ef..c5be773 100644
> > --- a/drivers/hv/hv_util.c
> > +++ b/drivers/hv/hv_util.c
> > @@ -340,12 +340,8 @@ static int util_probe(struct hv_device *dev,
> >
> >  	set_channel_read_state(dev->channel, false);
> >
> > -	ret = vmbus_open(dev->channel, 4 * PAGE_SIZE, 4 * PAGE_SIZE, NULL, 0,
> > -			srv->util_cb, dev->channel);
> > -	if (ret)
> > -		goto error;
> > -
> >  	hv_set_drvdata(dev, srv);
> > +
> >  	/*
> >  	 * Based on the host; initialize the framework and
> >  	 * service version numbers we will negotiate.
> > @@ -365,6 +361,11 @@ static int util_probe(struct hv_device *dev,
> >  		hb_srv_version = HB_VERSION;
> >  	}
> >
> > +	ret = vmbus_open(dev->channel, 4 * PAGE_SIZE, 4 * PAGE_SIZE, NULL, 0,
> > +			srv->util_cb, dev->channel);
> > +	if (ret)
> > +		goto error;
> > +
> >  	return 0;
> >
> >  error:
> 
> --
>   Vitaly
--
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