ide: remove IDE_ARCH_INTR (v2)

This micro-optimization is not worth it.  Just always check for
existence of ->ack_intr method in ide_intr() and ide_timer_expiry().

v2:
Fix brown-paper-bag bug spotted by David D. Kilzer.

Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Michael Schmitz <schmitz@debian.org>
Cc: "David D. Kilzer" <ddkilzer@kilzer.net>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

arch/m68k/include/asm/ide.h

@@ -123,8 +123,5 @@ ide_get_lock(irq_handler_t handler, void *data)
 }
 #endif /* CONFIG_BLK_DEV_FALCON_IDE */
 
-#define IDE_ARCH_ACK_INTR
-#define ide_ack_intr(hwif)	((hwif)->ack_intr ? (hwif)->ack_intr(hwif) : 1)
-
 #endif /* __KERNEL__ */
 #endif /* _M68K_IDE_H */

drivers/ide/ide-io.c

@@ -739,7 +739,8 @@ void ide_timer_expiry (unsigned long data)
 		} else if (drive_is_ready(drive)) {
 			if (drive->waiting_for_dma)
 				hwif->dma_ops->dma_lost_irq(drive);
-			(void)ide_ack_intr(hwif);
+			if (hwif->ack_intr)
+				hwif->ack_intr(hwif);
 			printk(KERN_WARNING "%s: lost interrupt\n",
 				drive->name);
 			startstop = handler(drive);
@@ -854,7 +855,7 @@ irqreturn_t ide_intr (int irq, void *dev_id)
 
 	spin_lock_irqsave(&hwif->lock, flags);
 
-	if (!ide_ack_intr(hwif))
+	if (hwif->ack_intr && hwif->ack_intr(hwif) == 0)
 		goto out;
 
 	handler = hwif->handler;

include/linux/ide.h

@@ -202,11 +202,6 @@ static inline void ide_std_init_ports(hw_regs_t *hw,
 
 #define MAX_HWIFS	10
 
-/* Currently only m68k, apus and m8xx need it */
-#ifndef IDE_ARCH_ACK_INTR
-# define ide_ack_intr(hwif) (1)
-#endif
-
 /* Currently only Atari needs it */
 #ifndef IDE_ARCH_LOCK
 # define ide_release_lock()			do {} while (0)