linux-kernel - RE: [PATCH v2 1/3] hv: hv_util: move vmbus

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Date:	Tue, 03 Feb 2015 03:16:46 +0008
From:	Jason Wang <jasowang@...hat.com>
To:	Dexuan Cui <decui@...rosoft.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>,
	KY Srinivasan <kys@...rosoft.com>,
	"vkuznets@...hat.com" <vkuznets@...hat.com>,
	Haiyang Zhang <haiyangz@...rosoft.com>
Subject: RE: [PATCH v2 1/3] hv: hv_util: move vmbus_open() to a later place



On Mon, Feb 2, 2015 at 6:09 PM, Dexuan Cui <decui@...rosoft.com> wrote:
>>  -----Original Message-----
>>  From: Jason Wang [mailto:jasowang@...hat.com]
>>  Sent: Monday, February 2, 2015 17:36 PM
>>  To: Dexuan Cui
>>  Cc: gregkh@...uxfoundation.org; linux-kernel@...r.kernel.org; 
>> driverdev-
>>  devel@...uxdriverproject.org; olaf@...fle.de; apw@...onical.com; KY
>>  Srinivasan; vkuznets@...hat.com; Haiyang Zhang
>>  Subject: Re: [PATCH v2 1/3] hv: hv_util: move vmbus_open() to a 
>> later place
>>  
>>  
>>  
>>  On Mon, Feb 2, 2015 at 12:35 PM, Dexuan Cui <decui@...rosoft.com> 
>> wrote:
>>  > Before the line vmbus_open() returns, srv->util_cb can be already
>>  > running
>>  > and the variables, like util_fw_version, are needed by the
>>  > srv->util_cb.
>>  
>>  A questions is why we do this for util only? Can callbacks of other
>>  devices be called before vmbus_open() returns?
> The variables are used in vmbus_prep_negotiate_resp(), which is only 
> for
> the util devices.
> 
> I think the other devices should already handle the similar issue 
> properly.
> If this is not the case, we need to fix them too.

Better to check all the others, e.g in balloon_probe(), it call 
hv_set_drvdata() after vmbus_open() and dose several datas setups in 
the middle. If balloon_onchannelcallback() could be called before 
hv_set_drvdata(), the code looks wrong.

Thanks



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