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From: Alex Dubov <oakad@yahoo.com>
To: Pavel Machek <pavel@ucw.cz>, Pierre Ossman <drzeus-mmc@drzeus.cx>,
	Greg KH <greg@kroah.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [mmc] incorrect behavior on resume
Date: Sat, 17 Feb 2007 17:46:35 -0800 (PST)	[thread overview]
Message-ID: <40069.12630.qm@web36708.mail.mud.yahoo.com> (raw)
In-Reply-To: <20070218002903.GF14773@elf.ucw.cz>


--- Pavel Machek <pavel@ucw.cz> wrote:

> On Sun 2007-02-18 00:35:33, Pierre Ossman wrote:
> > Alex Dubov wrote:
> > > And today: yet another problem with mmc.
> > > It so happens that after resume mmc layer issues requests to the device before
> mmc_resume_host is
> > > called at all. Moreover, this prevents the machine from resuming, unless worked around,
> because
> > > software timer does not work at this stage of the resume and interrupts may not be delivered
> (if
> > > card was removed, for example).
> > 
> > Now this sounds incredibly broken. A child device should never be resumed before
> > its parent. Pavel, can you comment?
> 
> No, child devices should not be resumed before their parents. Is it
> true child?
> 
> What bus is mmc on? Timer should be resumed fairly early...?
> 
> Can you confirm that rmmod/insmod of mmc around suspend fixes the issue?
> 
> But this is greg's area.
It sure does - if I'll do "rmmod mmc" I'd be forced to remove my driver as well (symbol
dependency) and the problem will magically disappear.

The problem here is that mmc_block's device is a child of real device (tifm_dev here), so it gets
resumed right after it. However, it correct functioning depends on mmc_core, which must be
manually resumed (mmc_resume_host). Therefore, I think this is purely mmc's problem.



 
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  reply	other threads:[~2007-02-18  1:46 UTC|newest]

Thread overview: 43+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-02-07 22:20 [2.6.20] tifm_7xx1/mmc not working Andreas Steinmetz
2007-02-08  5:59 ` Pierre Ossman
2007-02-08 23:35   ` Alex Dubov
2007-02-09 12:27     ` Andreas Steinmetz
2007-02-09 15:14   ` Recent and not-so problems with tifm_sd driver Alex Dubov
2007-02-09 19:10     ` Pierre Ossman
2007-02-10  9:12       ` Recent and not-so problems with tifm_sd driver - one more Alex Dubov
2007-02-10 13:01         ` Pierre Ossman
2007-02-11  6:03           ` Brad Campbell
2007-02-11 14:52             ` Fabio Comolli
2007-02-11 15:40             ` Pierre Ossman
2007-02-11 15:56               ` Brad Campbell
2007-02-11 18:04                 ` Pierre Ossman
2007-02-11 19:32                   ` Brad Campbell
2007-02-12  9:14                     ` Pierre Ossman
2007-02-12 10:50                       ` Brad Campbell
2007-02-12 13:21                     ` Andreas Steinmetz
2007-02-17 15:16                   ` [mmc] incorrect behavior on resume Alex Dubov
2007-02-17 23:35                     ` Pierre Ossman
2007-02-18  0:29                       ` Pavel Machek
2007-02-18  1:46                         ` Alex Dubov [this message]
2007-02-18  6:53                           ` Russell King
2007-02-18 12:18                             ` Alex Dubov
2007-02-11  4:47       ` Recent and not-so problems with tifm_sd driver Alex Dubov
2007-02-11 18:15         ` Pierre Ossman
2007-02-12 11:53           ` Alex Dubov
2007-02-12 13:49             ` Pierre Ossman
2007-02-13  0:44               ` Alex Dubov
2007-02-13 14:40               ` Alex Dubov
2007-02-17 23:14                 ` Pierre Ossman
2007-02-17 23:51             ` Pierre Ossman
2007-02-18  4:59               ` Alex Dubov
2007-02-18  8:13                 ` Pierre Ossman
2007-02-18 14:19                   ` Alex Dubov
2007-02-18 15:10                     ` Pierre Ossman
2007-02-18 23:48                       ` Alex Dubov
2007-02-19  7:06                         ` Pierre Ossman
2007-02-19 12:09                           ` Alex Dubov
2007-02-19 12:34                             ` Pierre Ossman
2007-02-20  1:30                               ` Alex Dubov
2007-02-20  7:03                                 ` Pierre Ossman
2007-03-14 14:44                               ` Weird MMC errors: 1 of 2 - bad ocr value Alex Dubov
2007-04-08 19:41                                 ` Pierre Ossman

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