libata-sff: PCI IRQ handling fix

It is legitimate (although annoying and silly) for a PCI IDE controller
not to be assigned an interrupt and to be polled. The libata-sff code
should therefore not try and request IRQ 0 in this case.

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

1 files changed, 5 insertions, 2 deletions

diff --git a/drivers/ata/libata-sff.c b/drivers/ata/libata-sff.c
index 48acc09dab96..b7ac80b4b1fb 100644
--- a/drivers/ata/libata-sff.c
+++ b/drivers/ata/libata-sff.c
@@ -806,7 +806,10 @@ int ata_pci_init_one(struct pci_dev *pdev,
         if (rc)
                 goto err_out;
 
-        if (!legacy_mode) {
+        if (!legacy_mode && pdev->irq) {
+                /* We may have no IRQ assigned in which case we can poll. This
+                   shouldn't happen on a sane system but robustness is cheap
+                   in this case */
                 rc = devm_request_irq(dev, pdev->irq, pi->port_ops->irq_handler,
                                       IRQF_SHARED, DRV_NAME, host);
                 if (rc)
@@ -814,7 +817,7 @@ int ata_pci_init_one(struct pci_dev *pdev,
 
                 ata_port_desc(host->ports[0], "irq %d", pdev->irq);
                 ata_port_desc(host->ports[1], "irq %d", pdev->irq);
-        } else {
+        } else if (legacy_mode) {
                 if (!ata_port_is_dummy(host->ports[0])) {
                         rc = devm_request_irq(dev, ATA_PRIMARY_IRQ(pdev),
                                               pi->port_ops->irq_handler,