linux-kernel - RE: [PATCH v3] hv: hv_fcopy: drop the obsolete message on transfer failure

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Date:	Wed, 14 Jan 2015 02:36:00 +0008
From:	Jason Wang <jasowang@...hat.com>
To:	Dexuan Cui <decui@...rosoft.com>
Cc:	Vitaly Kuznetsov <vkuznets@...hat.com>,
	KY Srinivasan <kys@...rosoft.com>,
	"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>,
	Haiyang Zhang <haiyangz@...rosoft.com>
Subject: RE: [PATCH v3] hv: hv_fcopy: drop the obsolete message on transfer
 failure



On Wed, Jan 14, 2015 at 9:43 AM, Dexuan Cui <decui@...rosoft.com> wrote:
>>  -----Original Message-----
>>  From: Vitaly Kuznetsov [mailto:vkuznets@...hat.com]
>>  Sent: Tuesday, January 13, 2015 21:52 PM
>>  To: Dexuan Cui; KY Srinivasan
>>  Cc: gregkh@...uxfoundation.org; linux-kernel@...r.kernel.org; 
>> driverdev-
>>  devel@...uxdriverproject.org; olaf@...fle.de; apw@...onical.com;
>>  jasowang@...hat.com; Haiyang Zhang
>>  Subject: Re: [PATCH v3] hv: hv_fcopy: drop the obsolete message on 
>> transfer
>>  failure
>>  
>>  Dexuan Cui <decui@...rosoft.com> writes:
>>  
>>  > In the case the user-space daemon crashes, hangs or is killed, we
>>  > need to down the semaphore, otherwise, after the daemon starts 
>> next
>>  > time, the obsolete data in fcopy_transaction.message or
>>  > fcopy_transaction.fcopy_msg will be used immediately.
>>  
>>  It seems this patch got lost and I don't see it in recent 'resend'
>>  series. K.Y., Dexuan, can you please take a look?
> Hi Vitaly, Jason,
> The patch can't fix all the corner cases (it would need non-trivial 
> efforts for that)
> as we discussed, but I think it would be better for us to have it as 
> it can indeed fix
> an obvious issue and doesn't introduce new issues.
> 
> I think I can document the known discussed corner cases in the patch 
> as TODOs
> and resend the patch.
> 
> Please let me know if you have different opinions. :-) 
> 
> Thanks,
> -- Dexuan

Yes, I think it's ok.
We can do other fixes on top.

Thanks

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