linux-kernel - Re: [PATCH] ATA: Fix port removal ordering

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Message-ID: <20131127185634.GD13098@mtj.dyndns.org>
Date:	Wed, 27 Nov 2013 13:56:34 -0500
From:	Tejun Heo <tj@...nel.org>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"James E.J. Bottomley" <JBottomley@...allels.com>,
	linux-ide@...r.kernel.org, Linux PCI <linux-pci@...r.kernel.org>
Subject: Re: [PATCH] ATA: Fix port removal ordering

On Mon, Nov 25, 2013 at 01:19:01PM +0100, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> 
> After commit bcdde7e221a8 (sysfs: make __sysfs_remove_dir() recursive)
> Mika Westerberg sees traces analogous to the one below in Thunderbolt
> hot-remove testing:
...
> The source of this problem is that SCSI hosts are removed from
> ATA ports after calling ata_tport_delete() which removes the
> port's sysfs directory, among other things.  Now, after commit
> bcdde7e221a8, the sysfs directory is removed along with all of
> its subdirectories that include the SCSI host's sysfs directory
> and its subdirectories at this point.  Consequently, when
> device_del() is finally called for any child device of the SCSI
> host and tries to remove its "power" group (which is already
> gone then), it triggers the above warning.
> 
> To make the warnings go away, change the removal ordering in
> ata_port_detach() so that the SCSI host is removed from the
> port before ata_tport_delete() is called.
> 
> References: https://bugzilla.kernel.org/show_bug.cgi?id=65281
> Reported-and-tested-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

Applied to libata/for-3.13-fixes.

Thanks!

-- 
tejun
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