pata_via: Cache and rewrite the device bit
authorAlan Cox <alan@lxorguk.ukuu.org.uk>
Fri, 17 Apr 2009 11:21:21 +0000 (12:21 +0100)
committerJeff Garzik <jgarzik@redhat.com>
Fri, 17 Apr 2009 23:04:30 +0000 (19:04 -0400)
commitb4746ed785d776b1be647458bc911cc607c6ef1c
tree1d900c29cbf43e81f06f30454a3a794bd882ebb4
parent299b3f8df90a3f7416d8df121d8a42b1a2aeced4
pata_via: Cache and rewrite the device bit

Some VIA chipsets will reset the DEV bit after IEN changes on ctl. Our
optimised write path avoids doing this but we need to remove the
optimisation on these devices.

[Identified and some original patches proposed by Josehn Chan @ VIA but
discussion then all ground to a halt so given a test case I dug it back out]

Signed-off-by: Alan Cox <alan@lxorguk.ukuu.org.uk
Tested-by: Christoph Bisping (bug #13086)
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
drivers/ata/pata_via.c