[PATCH] libata: set IRQF_SHARED for legacy PCI IDE IRQs

There are machines out there which share legacy PCI IDE IRQs w/ other
devices.  libata SFF interrupt/HSM code is ready for shared IRQ and
has been setting IRQF_SHARED for devices in native PCI mode.  Device
in legacy mode is still a PCI device and thus supposedly uses
active-low level triggered IRQ.

Machines with such setup should be quite rare and w/o this flag libata
is likely to fail loading and render the system unuseable.  Also, IDE
driver has been setting IRQF_SHARED for devices in legacy mode for a
looooong time.
Signed-off-by: Tejun Heo <htejun@gmail.com>

drivers/ata/libata-sff.c

@@ -906,6 +906,7 @@ static struct ata_probe_ent *ata_pci_init_legacy_port(struct pci_dev *pdev,
 		return NULL;
 
 	probe_ent->n_ports = 2;
+	probe_ent->irq_flags = IRQF_SHARED;
 
 	if (port_mask & ATA_PORT_PRIMARY) {
 		probe_ent->irq = ATA_PRIMARY_IRQ;