[ide] add ide_hwgroup_t.polling

ide_hwgroup_t.polling field added.  0 in poll_timeout field
used to indicate inactive polling but because 0 is a valid
jiffy value, though slim, there's a chance that something
weird can happen.
Signed-off-by: Tejun Heo <tj@home-tj.org>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

drivers/ide/ide-io.c

@@ -1314,7 +1314,7 @@ void ide_timer_expiry (unsigned long data)
 			/* local CPU only,
 			 * as if we were handling an interrupt */
 			local_irq_disable();
-			if (hwgroup->poll_timeout != 0) {
+			if (hwgroup->polling) {
 				startstop = handler(drive);
 			} else if (drive_is_ready(drive)) {
 				if (drive->waiting_for_dma)
@@ -1442,8 +1442,7 @@ irqreturn_t ide_intr (int irq, void *dev_id, struct pt_regs *regs)
 		return IRQ_NONE;
 	}
 
-	if ((handler = hwgroup->handler) == NULL ||
-	    hwgroup->poll_timeout != 0) {
+	if ((handler = hwgroup->handler) == NULL || hwgroup->polling) {
 		/*
 		 * Not expecting an interrupt from this drive.
 		 * That means this could be:

drivers/ide/ide-iops.c

@@ -1023,14 +1023,14 @@ static ide_startstop_t atapi_reset_pollfunc (ide_drive_t *drive)
 			return ide_started;
 		}
 		/* end of polling */
-		hwgroup->poll_timeout = 0;
+		hwgroup->polling = 0;
 		printk("%s: ATAPI reset timed-out, status=0x%02x\n",
 				drive->name, stat);
 		/* do it the old fashioned way */
 		return do_reset1(drive, 1);
 	}
 	/* done polling */
-	hwgroup->poll_timeout = 0;
+	hwgroup->polling = 0;
 	return ide_stopped;
 }
 
@@ -1090,7 +1090,7 @@ static ide_startstop_t reset_pollfunc (ide_drive_t *drive)
 			printk("\n");
 		}
 	}
-	hwgroup->poll_timeout = 0;	/* done polling */
+	hwgroup->polling = 0;	/* done polling */
 	return ide_stopped;
 }
 
@@ -1165,6 +1165,7 @@ static ide_startstop_t do_reset1 (ide_drive_t *drive, int do_not_try_atapi)
 		udelay (20);
 		hwif->OUTB(WIN_SRST, IDE_COMMAND_REG);
 		hwgroup->poll_timeout = jiffies + WAIT_WORSTCASE;
+		hwgroup->polling = 1;
 		__ide_set_handler(drive, &atapi_reset_pollfunc, HZ/20, NULL);
 		spin_unlock_irqrestore(&ide_lock, flags);
 		return ide_started;
@@ -1205,6 +1206,7 @@ static ide_startstop_t do_reset1 (ide_drive_t *drive, int do_not_try_atapi)
 	/* more than enough time */
 	udelay(10);
 	hwgroup->poll_timeout = jiffies + WAIT_WORSTCASE;
+	hwgroup->polling = 1;
 	__ide_set_handler(drive, &reset_pollfunc, HZ/20, NULL);
 
 	/*

drivers/ide/pci/siimage.c

@@ -590,7 +590,7 @@ static int siimage_reset_poll (ide_drive_t *drive)
 		if ((hwif->INL(SATA_STATUS_REG) & 0x03) != 0x03) {
 			printk(KERN_WARNING "%s: reset phy dead, status=0x%08x\n",
 				hwif->name, hwif->INL(SATA_STATUS_REG));
-			HWGROUP(drive)->poll_timeout = 0;
+			HWGROUP(drive)->polling = 0;
 			return ide_started;
 		}
 		return 0;

include/linux/ide.h

@@ -934,7 +934,9 @@ typedef struct hwgroup_s {
 		/* BOOL: protects all fields below */
 	volatile int busy;
 		/* BOOL: wake us up on timer expiry */
-	int sleeping;
+	int sleeping	: 1;
+		/* BOOL: polling active & poll_timeout field valid */
+	int polling	: 1;
 		/* current drive */
 	ide_drive_t *drive;
 		/* ptr to current hwif in linked-list */