[PATCH 7/7] libata: ack unexpected INTRQ when polling

[Albert Lee <albertcc@tw.ibm.com>]

patch 7/7:
 ack unexpected INTRQ when polling.
(Some device asserts INTRQ even if polling and nIEN = 1.
http://bugzilla.kernel.org/show_bug.cgi?id=8441)

Signed-off-by: Albert Lee <albertcc@tw.ibm.com>
---

diff -Nrup 06_irq_wq/drivers/ata/libata-core.c 07_ack_random_irq/drivers/ata/libata-core.c
--- 06_irq_wq/drivers/ata/libata-core.c	2007-05-11 11:54:56.000000000 +0800
+++ 07_ack_random_irq/drivers/ata/libata-core.c	2007-05-11 15:40:37.000000000 +0800
@@ -5211,9 +5211,12 @@ inline unsigned int ata_host_intr (struc
 	if (ap->pflags & ATA_PFLAG_HSM_WQ)
 		goto idle_irq;
 
-	/* polling */
-	if (qc->tf.flags & ATA_TFLAG_POLLING)
+	/* polling, while HSM not yet active in wq */
+	if (qc->tf.flags & ATA_TFLAG_POLLING) {
+		/* ack random irq */
+		ata_chk_status(ap);
 		goto idle_irq;
+	}
 
 	/* Check whether we are expecting interrupt in this state */
 	switch (ap->hsm_task_state) {