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>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 7 insertions, 4 deletions

diff --git a/drivers/ata/pata_isapnp.c b/drivers/ata/pata_isapnp.c
index 88ab0e1d353f..4320e7986321 100644
--- a/drivers/ata/pata_isapnp.c
+++ b/drivers/ata/pata_isapnp.c
@@ -75,13 +75,16 @@ static int isapnp_init_one(struct pnp_dev *idev, const struct pnp_device_id *dev
         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 @@ static int isapnp_init_one(struct pnp_dev *idev, const struct pnp_device_id *dev
                       (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);
 }