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

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Date:	Mon, 15 Sep 2014 15:39:08 +0100
From:	David Vrabel <david.vrabel@...rix.com>
To:	Chen Gang <gang.chen.5i5j@...il.com>, <konrad.wilk@...cle.com>,
	<boris.ostrovsky@...cle.com>, <stefano.stabellini@...citrix.com>,
	<mukesh.rathor@...cle.com>
CC:	<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 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?

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.

David
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