From: Alan Stern <stern@rowland.harvard.edu>
To: Ohad Ben-Cohen <ohad@wizery.com>
Cc: linux-wireless@vger.kernel.org, linux-mmc@vger.kernel.org,
Ido Yariv <ido@wizery.com>,
linux-pm@lists.linux-foundation.org,
Johannes Berg <johannes@sipsolutions.net>
Subject: Re: subtle pm_runtime_put_sync race and sdio functions
Date: Wed, 29 Dec 2010 23:30:21 -0500 (EST) [thread overview]
Message-ID: <Pine.LNX.4.44L0.1012292326220.13580-100000__13078.1531836421$1293683568$gmane$org@netrider.rowland.org> (raw)
In-Reply-To: <AANLkTi=QT1thWxy94=imJhbbcXQ1CD36=PnkAyaaA6Hj@mail.gmail.com>
On Wed, 29 Dec 2010, Ohad Ben-Cohen wrote:
> On Tue, Dec 28, 2010 at 11:46 PM, Alan Stern <stern@rowland.harvard.edu> wrote:
> > Similarly, during system suspend mmc_suspend_host() should be
> > responsible for doing all the necessary power-down operations. Runtime
> > PM is completely out of the picture at this time. And this should be
> > independent of mac80211 -- in fact, the card should be powered down
> > appropriately even if the kernel doesn't have a mac80211 layer.
>
> And it is.
>
> But in order to boot the firmware on resume, we need to reset the
> device. And if system suspend has been cancelled before
> mmc_power_off() was invoked, we will not be able to. So, in this case
> too, the driver will have to power the device off.
If the suspend transition was cancelled before mmc_power_off(), why do
you need to boot the firmware on resume? Since the device hasn't
actually been powered off, can't it continue using the same firmware as
before?
What routine is responsible for deciding to boot the firmware, and what
is its call path?
> It all really boils down to the same solution - we will always have to
> bypass runtime PM and directly control the power of the device.
While this is probably true, I'm not at all convinced that the current
design is layered correctly. Fixing the design might reduce the amount
of bypassing required.
Alan Stern
next prev parent reply other threads:[~2010-12-30 4:30 UTC|newest]
Thread overview: 180+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-12-09 23:37 subtle pm_runtime_put_sync race and sdio functions Ohad Ben-Cohen
2010-12-10 0:00 ` Rafael J. Wysocki
2010-12-10 0:00 ` [linux-pm] " Rafael J. Wysocki
2010-12-10 17:24 ` Alan Stern
2010-12-10 17:24 ` [linux-pm] " Alan Stern
2010-12-10 22:01 ` Rafael J. Wysocki
2010-12-10 22:01 ` [linux-pm] " Rafael J. Wysocki
2010-12-10 23:02 ` Ohad Ben-Cohen
2010-12-10 23:02 ` [linux-pm] " Ohad Ben-Cohen
2010-12-10 22:59 ` Ohad Ben-Cohen
2010-12-10 22:59 ` [linux-pm] " Ohad Ben-Cohen
2010-12-11 1:17 ` Ohad Ben-Cohen
2010-12-11 14:53 ` Alan Stern
2010-12-11 1:17 ` Ohad Ben-Cohen
2010-12-11 14:50 ` Alan Stern
2010-12-18 13:29 ` Ohad Ben-Cohen
2010-12-18 13:29 ` [linux-pm] " Ohad Ben-Cohen
2010-12-18 14:16 ` David Vrabel
2010-12-18 15:12 ` Ohad Ben-Cohen
2010-12-18 15:12 ` Ohad Ben-Cohen
2010-12-18 14:16 ` David Vrabel
2010-12-18 15:07 ` [linux-pm] " Rafael J. Wysocki
2010-12-18 16:00 ` Ohad Ben-Cohen
2010-12-18 16:00 ` [linux-pm] " Ohad Ben-Cohen
2010-12-18 16:40 ` Johannes Berg
2010-12-18 19:08 ` Ohad Ben-Cohen
2010-12-18 19:08 ` Ohad Ben-Cohen
2010-12-18 21:30 ` Alan Stern
2010-12-18 21:30 ` Alan Stern
2010-12-18 22:57 ` Rafael J. Wysocki
2010-12-18 22:57 ` [linux-pm] " Rafael J. Wysocki
2010-12-18 21:30 ` Alan Stern
2010-12-18 22:52 ` Rafael J. Wysocki
2010-12-18 22:52 ` [linux-pm] " Rafael J. Wysocki
2010-12-18 19:08 ` Ohad Ben-Cohen
2010-12-18 21:29 ` [linux-pm] " Alan Stern
2010-12-18 21:29 ` Alan Stern
2010-12-18 21:29 ` Alan Stern
2010-12-18 22:50 ` Rafael J. Wysocki
2010-12-18 22:50 ` [linux-pm] " Rafael J. Wysocki
2010-12-18 16:40 ` Johannes Berg
2010-12-18 22:47 ` [linux-pm] " Rafael J. Wysocki
2010-12-18 22:47 ` Rafael J. Wysocki
2010-12-19 7:48 ` Ohad Ben-Cohen
2010-12-19 7:48 ` Ohad Ben-Cohen
2010-12-19 7:48 ` Ohad Ben-Cohen
2010-12-19 10:22 ` Rafael J. Wysocki
2010-12-19 10:22 ` [linux-pm] " Rafael J. Wysocki
2010-12-20 3:37 ` Alan Stern
2010-12-20 3:37 ` Alan Stern
2010-12-20 21:17 ` Rafael J. Wysocki
2010-12-21 0:57 ` Alan Stern
2010-12-21 0:57 ` Alan Stern
2010-12-21 21:31 ` Rafael J. Wysocki
2010-12-22 1:42 ` Alan Stern
2010-12-22 1:42 ` Alan Stern
2010-12-22 12:29 ` Rafael J. Wysocki
2010-12-22 12:29 ` Rafael J. Wysocki
2011-01-26 23:28 ` Kevin Hilman
2011-01-26 23:28 ` Kevin Hilman
2011-01-27 18:13 ` Alan Stern
2011-01-27 18:13 ` [linux-pm] " Alan Stern
2011-01-27 18:13 ` Alan Stern
2011-01-27 19:22 ` Kevin Hilman
2011-01-27 19:22 ` [linux-pm] " Kevin Hilman
2011-01-27 19:22 ` Kevin Hilman
2011-01-27 19:49 ` Alan Stern
2011-01-27 19:49 ` [linux-pm] " Alan Stern
2011-01-27 19:49 ` Alan Stern
2011-01-27 20:15 ` Kevin Hilman
2011-01-27 20:15 ` [linux-pm] " Kevin Hilman
2011-01-27 20:15 ` Kevin Hilman
2011-01-27 22:18 ` Vitaly Wool
2011-01-27 22:18 ` Vitaly Wool
2011-01-27 22:18 ` Vitaly Wool
2011-01-27 23:21 ` Rafael J. Wysocki
2011-01-27 23:21 ` [linux-pm] " Rafael J. Wysocki
2011-01-27 23:49 ` Kevin Hilman
2011-01-27 23:49 ` [linux-pm] " Kevin Hilman
2011-01-27 23:11 ` Rafael J. Wysocki
2011-01-27 23:11 ` [linux-pm] " Rafael J. Wysocki
2011-01-27 18:20 ` Vitaly Wool
2011-01-27 18:20 ` [linux-pm] " Vitaly Wool
2011-01-27 18:20 ` Vitaly Wool
2011-01-27 18:54 ` Kevin Hilman
2011-01-27 18:54 ` [linux-pm] " Kevin Hilman
2010-12-22 12:29 ` Rafael J. Wysocki
2010-12-22 1:42 ` Alan Stern
2010-12-21 21:31 ` Rafael J. Wysocki
2010-12-21 0:57 ` Alan Stern
2010-12-20 21:17 ` Rafael J. Wysocki
2010-12-20 3:37 ` Alan Stern
2010-12-21 22:23 ` Kevin Hilman
2010-12-21 22:23 ` [linux-pm] " Kevin Hilman
2010-12-22 1:48 ` Alan Stern
2010-12-22 1:48 ` Alan Stern
2010-12-22 1:48 ` Alan Stern
2010-12-23 7:51 ` Ohad Ben-Cohen
2010-12-23 7:51 ` [linux-pm] " Ohad Ben-Cohen
2010-12-23 16:03 ` Alan Stern
2010-12-23 16:03 ` [linux-pm] " Alan Stern
2010-12-23 16:03 ` Alan Stern
2010-12-25 7:34 ` Ohad Ben-Cohen
2010-12-25 7:34 ` Ohad Ben-Cohen
2010-12-25 16:21 ` Alan Stern
2010-12-25 16:21 ` Alan Stern
2010-12-25 20:58 ` Ohad Ben-Cohen
2010-12-25 20:58 ` [linux-pm] " Ohad Ben-Cohen
2010-12-25 20:58 ` Ohad Ben-Cohen
2010-12-25 21:50 ` Vitaly Wool
2010-12-25 21:50 ` [linux-pm] " Vitaly Wool
2010-12-26 5:27 ` Ohad Ben-Cohen
2010-12-26 5:27 ` [linux-pm] " Ohad Ben-Cohen
2010-12-25 21:54 ` Vitaly Wool
2010-12-25 21:54 ` Vitaly Wool
2010-12-25 21:54 ` Vitaly Wool
2010-12-26 2:48 ` [linux-pm] " Alan Stern
2010-12-26 2:48 ` Alan Stern
2010-12-26 5:55 ` Ohad Ben-Cohen
2010-12-26 5:55 ` [linux-pm] " Ohad Ben-Cohen
2010-12-26 5:55 ` Ohad Ben-Cohen
2010-12-26 11:45 ` Rafael J. Wysocki
2010-12-26 12:43 ` Ohad Ben-Cohen
2010-12-26 12:43 ` [linux-pm] " Ohad Ben-Cohen
2010-12-26 12:43 ` Ohad Ben-Cohen
2010-12-26 18:35 ` Rafael J. Wysocki
2010-12-28 19:11 ` Ohad Ben-Cohen
2010-12-28 19:11 ` [linux-pm] " Ohad Ben-Cohen
2010-12-28 19:21 ` Rafael J. Wysocki
2010-12-28 19:21 ` [linux-pm] " Rafael J. Wysocki
2010-12-28 19:21 ` Rafael J. Wysocki
2010-12-28 19:34 ` Ohad Ben-Cohen
2010-12-28 20:36 ` Rafael J. Wysocki
2010-12-28 20:36 ` [linux-pm] " Rafael J. Wysocki
2010-12-28 19:34 ` Ohad Ben-Cohen
2010-12-26 18:35 ` Rafael J. Wysocki
2010-12-26 14:53 ` [linux-pm] " Ohad Ben-Cohen
2010-12-26 18:37 ` Rafael J. Wysocki
2010-12-26 18:37 ` [linux-pm] " Rafael J. Wysocki
2010-12-28 19:15 ` Ohad Ben-Cohen
2010-12-28 20:04 ` Rafael J. Wysocki
2010-12-28 20:04 ` [linux-pm] " Rafael J. Wysocki
2010-12-28 20:04 ` Rafael J. Wysocki
2010-12-28 20:41 ` Ohad Ben-Cohen
2010-12-28 20:41 ` [linux-pm] " Ohad Ben-Cohen
2010-12-28 20:41 ` Ohad Ben-Cohen
2010-12-28 19:15 ` Ohad Ben-Cohen
2010-12-26 14:53 ` Ohad Ben-Cohen
2010-12-26 11:45 ` Rafael J. Wysocki
2010-12-26 17:00 ` [linux-pm] " Alan Stern
2010-12-26 17:00 ` Alan Stern
2010-12-28 19:04 ` Ohad Ben-Cohen
2010-12-28 19:04 ` [linux-pm] " Ohad Ben-Cohen
2010-12-28 19:04 ` Ohad Ben-Cohen
2010-12-28 21:46 ` Alan Stern
2010-12-28 21:46 ` [linux-pm] " Alan Stern
2010-12-28 21:46 ` Alan Stern
2010-12-29 6:34 ` Ohad Ben-Cohen
2010-12-30 4:25 ` Alan Stern
2010-12-30 4:25 ` Alan Stern
2010-12-30 4:25 ` Alan Stern
2010-12-29 6:34 ` Ohad Ben-Cohen
2010-12-29 8:01 ` Ohad Ben-Cohen
2010-12-29 8:01 ` [linux-pm] " Ohad Ben-Cohen
2010-12-30 4:30 ` Alan Stern [this message]
2010-12-30 4:30 ` Alan Stern
2010-12-30 4:30 ` Alan Stern
2010-12-26 17:00 ` Alan Stern
2010-12-26 2:48 ` Alan Stern
2010-12-25 16:21 ` Alan Stern
2010-12-25 7:34 ` Ohad Ben-Cohen
2010-12-18 22:47 ` Rafael J. Wysocki
2010-12-18 15:07 ` Rafael J. Wysocki
2010-12-18 21:20 ` [linux-pm] " Alan Stern
2010-12-18 23:03 ` Rafael J. Wysocki
2010-12-18 23:03 ` Rafael J. Wysocki
2010-12-19 10:00 ` [linux-pm] " Ohad Ben-Cohen
2010-12-19 10:00 ` Ohad Ben-Cohen
2010-12-18 21:20 ` Alan Stern
2010-12-09 23:37 Ohad Ben-Cohen
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