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From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Mark Lord <lkml@rtr.ca>
Cc: Sergei Shtylyov <sshtylyov@ru.mvista.com>,
	Linas Vepstas <linas@austin.ibm.com>,
	linux-ide@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [BUG] ide dma_timer_expiry, then hard lockup
Date: Tue, 19 Jun 2007 17:17:45 +0100	[thread overview]
Message-ID: <20070619171745.7c2240bf@the-village.bc.nu> (raw)
In-Reply-To: <4677F881.6060200@rtr.ca>

> >    Indeed... but the thing is we don't know what's asserted in this case 
> > -- remember, it's reading the status register that locks everything up...
> 
> Exactly.  And IORDY shouldn't really apply there,
> unless some nitwit standards person wrote it into a spec..

Could it be we need to reset the state machine at this point before we
touch the registers again - that wouldn't be the first controller with
this limit and undocumented.

On the 370 we already 

Linas; For the debug on the libata one turn on ATA_DEBUG and
ATA_VERBOSE_DEBUG in include/linux/libata.h and it should spew
diagnostics before the freeze. I suspect thats a different problem to the
hang you see now but I'd like to debug both.

Alan

  parent reply	other threads:[~2007-06-19 16:19 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-06-18 17:57 [BUG] ide dma_timer_expiry, then hard lockup Linas Vepstas
2007-06-18 18:11 ` Stuart_Hayes
2007-06-19 14:07   ` Sergei Shtylyov
2007-06-19 15:05     ` Linas Vepstas
2007-06-19 16:10       ` Sergei Shtylyov
2007-06-19 16:48         ` Linas Vepstas
2007-06-19 18:43           ` Bartlomiej Zolnierkiewicz
2007-06-19 20:07             ` Sergei Shtylyov
2007-06-20 16:28               ` Linas Vepstas
2007-06-20 17:01                 ` Alan Cox
2007-06-21 17:58                   ` Sergei Shtylyov
2007-06-21 21:41                     ` Alan Cox
2007-06-21 19:47                   ` Linas Vepstas
2007-06-21 22:04                     ` Alan Cox
2007-06-18 20:27 ` Alan Cox
2007-06-18 20:46   ` Linas Vepstas
2007-06-18 21:04     ` Alan Cox
2007-06-18 21:22       ` Linas Vepstas
2007-06-19 14:56         ` bug in libata [was " Linas Vepstas
2007-06-19 14:10       ` Sergei Shtylyov
2007-06-19 14:19         ` Alan Cox
2007-06-19 14:24           ` Sergei Shtylyov
2007-06-19 15:38             ` Mark Lord
2007-06-19 15:51               ` Sergei Shtylyov
2007-06-19 16:17               ` Alan Cox [this message]
2007-06-19 16:32                 ` Sergei Shtylyov
2007-06-22 15:39 ` Sergei Shtylyov
2007-06-29 18:52   ` Sergei Shtylyov

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