libata: add @timeout to ata_exec_internal[_sg]()

Add @timeout argument to ata_exec_internal[_sg]().  If 0, default
timeout ata_probe_timeout is used.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
diff --git a/drivers/ata/libata-acpi.c b/drivers/ata/libata-acpi.c
index f862e07d..3f75335 100644
--- a/drivers/ata/libata-acpi.c
+++ b/drivers/ata/libata-acpi.c
@@ -478,7 +478,7 @@
 			       tf.lbal, tf.lbam, tf.lbah, tf.device);
 
 	rtf = tf;
-	err_mask = ata_exec_internal(dev, &rtf, NULL, DMA_NONE, NULL, 0);
+	err_mask = ata_exec_internal(dev, &rtf, NULL, DMA_NONE, NULL, 0, 0);
 	if (err_mask) {
 		ata_dev_printk(dev, KERN_ERR,
 			"ACPI cmd %02x/%02x:%02x:%02x:%02x:%02x:%02x failed "