[PATCH 0/1] libata: set NODEV_HINT for 0x7f status

[TJ]

Bug: #293218

https://launchpad.net/bugs/293218

Please cherry-pick b919930c34e99a48d6b13a5ec9db8c059ec44d72 from

git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git

    libata: set NODEV_HINT for 0x7f status
    
    Asus Pundit-R with atiixp controller has the second port missing and,
    very unusually, its status is stuck at 0x7f and all others at 0.  This
    meanst that it fails TF access test but gets detected as a disk due to
    classification code check and then evades polling IDENTIFY presence
    detection thanks to the missing BSY in the status value causing
    excessive delays during boot.
    
    This patch makes libata-sff HSM set NODEV_HINT if the status is 0x7f
    to make polling IDENTIFY presence detection work for these machines.
    
    Signed-off-by: Tejun Heo <tj at kernel.org>
    Signed-off-by: Jeff Garzik <jgarzik at redhat.com>