linux-kernel - Re: [PATCH] genhd fix or ide workaround -- choose one

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Date:	Thu, 19 Oct 2006 13:05:52 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	cbou@...l.ru
Cc:	kernel-discuss@...dhelds.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] genhd fix or ide workaround -- choose one

Ar Iau, 2006-10-19 am 02:15 +0400, ysgrifennodd Anton Vorontsov:
> Hi all,
> 
> I've caught deadlock inside IDE layer using IDE-CS: after accessing
> to IDE disk placed in PCMCIA (CF card really), it will never probe
> again after pulling it from PCMCIA/CF.

Works for me, and has done for a long time and I've also had no other
reports of this in the past couple of years so I'm curious what trips it
in your case ?

> The kernel is stuck at
> drivers/ide/ide.c:ide_unregister():604:
> 
>         602                 spin_unlock_irq(&ide_lock);
>         603                 device_unregister(&drive->gendev);
>         604                 wait_for_completion(&drive->gendev_rel_comp);
>         605                 spin_lock_irq(&ide_lock);

We need to know all the references have gone away, if someone has a disk
referenced and you pull it out we can't clean up immediately so this is
the right place to get stuck both on a refcounting bug and if you've got
something holding a reference for real (eg HAL)



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