linux-kernel - RE: [PATCH] Time out for possible dead loops during queued invalidation wait

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Date:	Wed, 27 May 2009 16:25:52 -0700
From:	"Yu, Fenghua" <fenghua.yu@...el.com>
To:	'Andrew Morton' <akpm@...ux-foundation.org>
CC:	"'dwmw2@...radead.org'" <dwmw2@...radead.org>,
	"'mingo@...e.hu'" <mingo@...e.hu>,
	"'linux-kernel@...r.kernel.org'" <linux-kernel@...r.kernel.org>,
	"'iommu@...ts.linux-foundation.org'" 
	<iommu@...ts.linux-foundation.org>
Subject: RE: [PATCH] Time out for possible dead loops during queued
 invalidation wait

>> Which error code is better? Is EAGAIN ok?
>
>That depends on driver details - probably EIO would be suitable, dunno.
>
>But all the callers of qi_submit_sync() seem to just drop the error
>code on the floor:
>
>	/* should never fail */
>	qi_submit_sync(&desc, iommu);
>
>and may well cause a kernel crash as a result.

Should the code go to kernel panic after timeout in qi_submit_sync() loops? When timeout (10 seconds) in the loops, something in hardware could be wrong.

Thanks.

-Fenghua
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