linux-kernel - [ 29/94] libata: forbid port runtime pm by default, fixing regression

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Message-Id: <20120527010427.857363446@linuxfoundation.org>
Date:	Sun, 27 May 2012 10:04:52 +0900
From:	Greg KH <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Lin Ming <ming.m.lin@...el.com>,
	Jeff Garzik <jgarzik@...hat.com>
Subject: [ 29/94] libata: forbid port runtime pm by default, fixing regression

3.3-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Lin Ming <ming.m.lin@...el.com>

commit 0c8d32c27f5cf6e14ca14b4758d1e994eebd50fd upstream.

Forbid port runtime pm by default because it has known hotplug issue.
User can allow it by, for example

echo auto > /sys/devices/pci0000:00/0000:00:1f.2/ata2/power/control

Signed-off-by: Lin Ming <ming.m.lin@...el.com>
Signed-off-by: Jeff Garzik <jgarzik@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/ata/libata-transport.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/ata/libata-transport.c
+++ b/drivers/ata/libata-transport.c
@@ -294,6 +294,7 @@ int ata_tport_add(struct device *parent,
 	device_enable_async_suspend(dev);
 	pm_runtime_set_active(dev);
 	pm_runtime_enable(dev);
+	pm_runtime_forbid(dev);
 
 	transport_add_device(dev);
 	transport_configure_device(dev);


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