linux-kernel - [RFC 0/3] libata/ahci unbinding, power down sequence

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Date:	Thu, 25 Oct 2012 09:55:58 -0700
From:	Brian Norris <computersforpeace@...il.com>
To:	Jeff Garzik <jgarzik@...ox.com>
Cc:	<linux-ide@...r.kernel.org>, <linux-pm@...ts.linux-foundation.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Brian Norris <computersforpeace@...il.com>,
	Kevin Cernekee <cernekee@...il.com>, Tejun Heo <tj@...nel.org>
Subject: [RFC 0/3] libata/ahci unbinding, power down sequence

Hello,

I sent out a few questions/suggestions earlier, regarding some trouble I was
having in supporting my SoC SATA controller under the libata / ahci_platform
driver:

    http://article.gmane.org/gmane.linux.ide/52951/match=unbind+rmmod

I think I have identified a problem in libata's handling of hardware activity
at device removal/exit (relevant to my use-case of unbind or rmmod). This patch series:

(1) Allows ahci_platform to unbind a device from the driver. This is useful for
    allowing total power-off of the device, for instance.
(2) Modifies libata-core so that ata_host_stop() is not called as a devres
    cleanup function (after all driver-specific functions, including power-off)

The first two patches are relatively harmless and correct, I believe, where the
third patch is more significant and could use good review. I am sending code
because I hear no response to my standalone suggestions :) Please see my
previous email (URL above) and/or patch 3/3 for a more detailed description.

Thanks,
Brian

Brian Norris (3):
  ahci_platform: enable hotplug unbinding
  ahci_platform: convert to module_platform_driver
  libata: don't perform HW activity in devres

 drivers/ata/ahci_platform.c | 16 +++-------------
 drivers/ata/libata-core.c   | 18 +++---------------
 2 files changed, 6 insertions(+), 28 deletions(-)

-- 
1.7.11.3

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