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Date: Sun, 18 Feb 2007 06:19:03 -0800 (PST)
From: Alex Dubov <oakad@yahoo.com>
Subject: Re: Recent and not-so problems with tifm_sd driver
To: Pierre Ossman <drzeus-mmc@drzeus.cx>
Cc: linux-kernel@vger.kernel.org
In-Reply-To: <45D80A94.308@drzeus.cx>
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> 
> I don't see how that is possible. mmc_block's remove routine waits for mmcqd to
> exit, so there can't be any code still alive that has a request going. (I am
> also completely unable to reproduce this problem here).
> 
> Add more printk:s do verify how the code in mmc_block executes.
> 
This is hard to trigger problem, so I'll spare you the rather lengthy log.
It happens if card timeouts and mmc_remove_host is called while mmc_register_card is still in
progress (the hint was in crash dump). If I sleep before remove, it gives the mmc_register_card
chance to finish/mark card as dead and everything's fine.
The remove callback of mmc_block is apparently not executed in this case (probably because device
has not finished registering).

My proposition: lets flush the workqueue first thing in the mmc_remove_host (and make sure that
nothing gets scheduled into it after this). 


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