linux-kernel - Re: [PATCH 4/4] drivers/xen/xenbus/xenbus_client.c: Improve the failure processing for __xenbus_switch

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Message-ID: <54176ECD.8090807@gmail.com>
Date:	Tue, 16 Sep 2014 06:57:17 +0800
From:	Chen Gang <gang.chen.5i5j@...il.com>
To:	David Vrabel <david.vrabel@...rix.com>
CC:	konrad.wilk@...cle.com, boris.ostrovsky@...cle.com,
	stefano.stabellini@...citrix.com, mukesh.rathor@...cle.com,
	xen-devel@...ts.xenproject.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/4] drivers/xen/xenbus/xenbus_client.c: Improve the failure
 processing for __xenbus_switch_state()

On 09/15/2014 10:39 PM, David Vrabel wrote:
> On 14/09/14 11:52, Chen Gang wrote:
>> When failure occurs, need return failure code instead of 0, or the upper
>> caller will misunderstand.
>>
>> Also when retry for EAGAIN reason, better to schedule out for a while,
>> so can let others have chance to continue their tasks (especially,
>> their tasks are related EAGAIN under UP kernel).
> 
> Is this fixing a real world problem you have seen?
> 

Not real world, only reading by source code, and some of upper level
callers really check the return value, indirectly (they may
misunderstand).

> xenbus_scanf() and xenbus_printf() already sleep while waiting for the
> response and delaying isn't going to reduce the likelihood of the
> transaction being aborted on the retry.
> 

OK, thanks, what you said sound reasonable to me, I shall remove the
waiting code when send patch v2 for it.


I shall try to send patch v2 within this week end (2014-09-21), if it is
too late to bare, please let me know (I shall try in time).

Thanks.
-- 
Chen Gang

Open share and attitude like air water and life which God blessed
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