From patchwork Wed Apr 18 17:29:27 2012
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Subject: Hotplug borked after suspend/resume in Linux-3.3 ?
Date: Wed, 18 Apr 2012 07:29:27 -0000
From: Jeff Garzik <jgarzik@pobox.com>
X-Patchwork-Id: 153542
Message-Id: <4F8EF9F7.5040202@pobox.com>
To: Martin Mokrejs <mmokrejs@fold.natur.cuni.cz>
Cc: cwillu <cwillu@cwillu.com>, Mark Lord <kernel@teksavvy.com>,
 Tejun Heo <htejun@gmail.com>,
 IDE/ATA development list <linux-ide@vger.kernel.org>

On 04/18/2012 01:10 PM, Martin Mokrejs wrote:
> Fix: I got my 3TB disk detected by this single command:
>
> # echo on>   /sys/devices/pci0000:00/0000:00:1f.2/ata6/power/control
> #
>
> This is a Dell Vostro 3550 with A09 BIOS. Same happend with 3.4-rc3 kernel.
>
> I can do some more testing if you want me to.
> Best,
> Martin


Can you test this one-line patch from Lin Ming?  Hopefully there is zero 
sysfs twiddling required with this one...

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--- 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);