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Subject[PATCH] pata_isapnp: Polled devices
If a card has no IRQ then pass no interrupt handler but allow polled
usage.

Signed-off-by: Alan Cox <alan@redhat.com>

diff -u --new-file --recursive --exclude-from /usr/src/exclude linux.vanilla-2.6.24-rc2-mm1/drivers/ata/pata_isapnp.c linux-2.6.24-rc2-mm1/drivers/ata/pata_isapnp.c
--- linux.vanilla-2.6.24-rc2-mm1/drivers/ata/pata_isapnp.c 2007-11-16 17:54:39.000000000 +0000
+++ linux-2.6.24-rc2-mm1/drivers/ata/pata_isapnp.c 2007-11-16 18:14:29.000000000 +0000
@@ -75,13 +75,16 @@
struct ata_host *host;
struct ata_port *ap;
void __iomem *cmd_addr, *ctl_addr;
+ int irq = 0;
+ irq_handler_t handler = NULL;

if (pnp_port_valid(idev, 0) == 0)
return -ENODEV;

- /* FIXME: Should selected polled PIO here not fail */
- if (pnp_irq_valid(idev, 0) == 0)
- return -ENODEV;
+ if (pnp_irq_valid(idev, 0)) {
+ irq = pnp_irq(idev, 0);
+ handler = ata_interrupt;
+ }

/* allocate host */
host = ata_host_alloc(&idev->dev, 1);
@@ -115,7 +118,7 @@
(unsigned long long)pnp_port_start(idev, 1));

/* activate */
- return ata_host_activate(host, pnp_irq(idev, 0), ata_interrupt, 0,
+ return ata_host_activate(host, irq, handler, 0,
&isapnp_sht);
}

-
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