pata_it821x: fix lost interrupt with atapi devices
authorJeff Norden <jnorden@math.tntech.edu>
Tue, 4 Sep 2007 16:07:20 +0000 (11:07 -0500)
committerJeff Garzik <jeff@garzik.org>
Tue, 11 Sep 2007 01:53:00 +0000 (21:53 -0400)
commitbce7d5e0e1fc0c1f1251b7f21a19cb48207408b6
tree8155b39f1d7f03f96b556bbe1df6b6be853c7a1a
parent08ebd43d6b9b63de681b8f255c0fabae8033527c
pata_it821x: fix lost interrupt with atapi devices

Fix "lost" interrupt problem when using dma with CD/DVD drives in some
configurations.  This problem can make installing linux from media
impossible for distro's that have switched to libata-only configurations.

The simple fix is to eliminate the use of dma for reading drive status, etc,
by checking the number of bytes to transferred.

This change will only affect the behavior of atapi devices, not disks.
There is more info at http://bugzilla.redhat.com/show_bug.cgi?id=242229
This patch is for 2.6.22.1

Signed-off-by: Jeff Norden <jnorden@math.tntech.edu>
Reviewed-by: Alan Cox <alan@redhat.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
drivers/ata/pata_it821x.c