libata: Support PIO polling-only hosts.

By default ata_host_activate() expects a valid IRQ in order to
successfully register the host. This patch enables a special case
for registering polling-only hosts that either don't have IRQs
or have buggy IRQ generation (either in terms of handling or
sensing), which otherwise work fine.

Hosts that want to use polling mode can simply set ATA_FLAG_PIO_POLLING
and pass in an invalid IRQ.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index ec3ce120a51708ab299d9bd4c22e09e1041356d8..89fd0e9ed746d0810d0a594ff00e43bf87748d70 100644 (file)
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -7178,6 +7178,10 @@ int ata_host_register(struct ata_host *host, struct scsi_host_template *sht)
  *     request IRQ and register it.  This helper takes necessasry
  *     arguments and performs the three steps in one go.
  *
+ *     An invalid IRQ skips the IRQ registration and expects the host to
+ *     have set polling mode on the port. In this case, @irq_handler
+ *     should be NULL.
+ *
  *     LOCKING:
  *     Inherited from calling layer (may sleep).
  *
@@ -7194,6 +7198,12 @@ int ata_host_activate(struct ata_host *host, int irq,
        if (rc)
                return rc;
 
+       /* Special case for polling mode */
+       if (!irq) {
+               WARN_ON(irq_handler);
+               return ata_host_register(host, sht);
+       }
+
        rc = devm_request_irq(host->dev, irq, irq_handler, irq_flags,
                              dev_driver_string(host->dev), host);
        if (rc)