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authorTejun Heo <htejun@gmail.com>2008-05-01 03:03:08 +0200
committerJeff Garzik <jgarzik@redhat.com>2008-05-06 17:33:53 +0200
commitcb6716c879ecf49e2af344926c6a476821812061 (patch)
treeed6f4ef6d78fe448aa8ec782b4eef6f83364aaa5 /drivers/ata/pata_sch.c
parentlibata: improve post-reset device ready test (diff)
downloadlinux-cb6716c879ecf49e2af344926c6a476821812061.tar.xz
linux-cb6716c879ecf49e2af344926c6a476821812061.zip
ata_piix: verify SIDPR access before enabling it
On certain configurations (certain macbooks), even though all the conditions for SIDPR access described in the datasheet are met, actually reading those registers just returns 0 and have no effect on write. Verify SIDPR is actually working before enabling it. This is reported by Ryan Roth in bz#10512. Signed-off-by: Tejun Heo <htejun@gmail.com> Cc: Ryan Roth <ryan.roth@ch2m.com> Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
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