Re: [PATCH] Time out for possible dead loops during queuedinvalidation wait

From: Andrew Morton
Date: Wed May 27 2009 - 18:49:23 EST

On Wed, 27 May 2009 15:40:35 -0700
"Yu, Fenghua" <fenghua.yu@xxxxxxxxx> wrote:

> >> + WARN(1, "No space in invalidation queue.\n");
> >> + return -ENOSPC;
> >
> >ENOSPC means "your disk filled up". I think it makes no sense to use
> >that error code in this context, even though it kinda sounds the same.
> >
> 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.
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