[PATCH] libata: refuse to register IRQless ports

We don't currently support pure polled operation so when we meet a BIOS
which forgot to assign an IRQ to a PCI device it all goes a little pear
shaped. Trap this case properly.

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

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 753b0152afd1..b4abd6850367 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -5453,6 +5453,11 @@ int ata_device_add(const struct ata_probe_ent *ent)
         int rc;
 
         DPRINTK("ENTER\n");
+        
+        if (ent->irq == 0) {
+                dev_printk(KERN_ERR, dev, "is not available: No interrupt assigned.\n");
+                return 0;
+        }
         /* alloc a container for our list of ATA ports (buses) */
         host = kzalloc(sizeof(struct ata_host) +
                        (ent->n_ports * sizeof(void *)), GFP_KERNEL);