linux-kernel - Re: [BUG] ide dma_timer

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Message-ID: <46783777.10607@ru.mvista.com>
Date:	Wed, 20 Jun 2007 00:07:19 +0400
From:	Sergei Shtylyov <sshtylyov@...mvista.com>
To:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
Cc:	Linas Vepstas <linas@...tin.ibm.com>, Stuart_Hayes@...l.com,
	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [BUG] ide dma_timer_expiry, then hard lockup

Bartlomiej Zolnierkiewicz wrote:

>>There are two distinct issues.
>>-- libata locks up in partition table read on an hpt366+old maxtor disk
>>   that has ben working fine for many years with old ide driver. (It
>>   still works fine when I boot to the alternate ide-based kernel).

>>-- ide driver locks up on hpt366+new maxtor disk under heavy 
>>   i/o load. I was able to copy 60GB from old to new disk without a
>>   problem; however, raid reconstruction locks it up, maybe after 5-15
>>   seconds.

>>   This probably is "hardware related"; its something that the new 
>>   hard drive does. Given that its being sold at a big discount, it
>>   may even be that the sellers know that this is a crappy disk. :-)

>>   All I want is some way of resetting the disk, and continuing on.

> It would be useful to see hdparm --Istdout output for *both* disks.

>>I'm stalled in debugging; I'm not sue what I'm looking for.

> Sergei, do you think that testing the drive with DMA disabled may
> tell us something new?

    Not sure. I'll try to come up with a patch esetting the state machine in 
dma_timeout() method (following Alan's idea) -- HPT366 regs are different 
enough to use the one for HPT370.

> Thanks,
> Bart

MBR, Sergei
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