linux-kernel - Re: [PATCH 3/4] BUG_ON on kernel misbehavior on A100U2W driver

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Message-Id: <1216135067.3312.40.camel@localhost.localdomain>
Date:	Tue, 15 Jul 2008 10:17:47 -0500
From:	James Bottomley <James.Bottomley@...senPartnership.com>
To:	Mikulas Patocka <mpatocka@...hat.com>
Cc:	torvalds@...ux-foundation.org, linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/4] BUG_ON on kernel misbehavior on A100U2W driver

On Tue, 2008-07-15 at 10:14 -0400, Mikulas Patocka wrote:
> With broken Sparc64 IOMMU accounting, the kernel submits larger requests 
> then allowed. Better to crash on BUG than corrupt memory. This needs to be 
> fixed in sparc64 code.

This analysis is correct ... and the reason we don't add driver work
arounds, so it really needs to be fixed in sparc, not worked around in
the driver.

James


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