tree c48274decc14c4d71dd99f9c3f93087698e767f4
parent d73f30e1c9a9af14757fa5bf4014343926047156
author Alan <alan@lxorguk.ukuu.org.uk> 1168258205 +0000
committer Jeff Garzik <jeff@garzik.org> 1171060770 -0500

libata-sff: Don't try and activate channels which are not in use

An ATA controller in native mode may have one or more channels disabled
and not assigned resources. In that case the existing code crashes trying
to access I/O ports 0-7.

Add the neccessary check.

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>