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pata_legacy: fix io/irq mismatch

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pata_legacy fails to detect the disk on my old ISA/VLB 486:
it starts to probe io=0x1f0 ctr=0x3f6 irq=15, complains
loudly about IDENTIFYs timing out, and finally fails.
(Sorry I couldn't capture the kernel's boot messages.)

It turns out that the driver's mapping from io to irq in
legacy_irq[] is wrong: index 0 for io=0x1f0 has irq=15 but
should have irq=14, and index 1 for io=0x170 has irq=14 but
should have irq=15. This is confirmed by a comparison with
include/asm-i386/ide.h:ide_default_irq().

This patch swaps the first two elements in legacy_irq[],
which makes pata_legacy work on my 486.

Signed-off-by: Mikael Pettersson <mikpe@it.uu.se>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Mikael Pettersson 2007-03-03 20:57:44 +01:00 committed by Jeff Garzik
parent 8af12cdb7c
commit 8b966dddc2
1 changed files with 1 additions and 1 deletions
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2
drivers/ata/pata_legacy.c
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@ -69,7 +69,7 @@
#define NR_HOST 6
static int legacy_port[NR_HOST] = { 0x1f0, 0x170, 0x1e8, 0x168, 0x1e0, 0x160 };
static int legacy_irq[NR_HOST] = { 15, 14, 11, 10, 8, 12 };
static int legacy_irq[NR_HOST] = { 14, 15, 11, 10, 8, 12 };
struct legacy_data {
unsigned long timing;