ali14xx: fix deadlock on error handling

Stop abusing ide_lock lock by switching to a private locking.

Fixes same issue as fixed by Alan Cox in atiixp host driver with
commit 6c5f8cc3.
Acked-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

drivers/ide/legacy/ali14xx.c

@@ -102,6 +102,8 @@ static void outReg (u8 data, u8 reg)
 	outb_p(data, dataPort);
 }
 
+static DEFINE_SPINLOCK(ali14xx_lock);
+
 /*
  * Set PIO mode for the specified drive.
  * This function computes timing parameters
@@ -129,14 +131,14 @@ static void ali14xx_set_pio_mode(ide_drive_t *drive, const u8 pio)
 
 	/* stuff timing parameters into controller registers */
 	driveNum = (HWIF(drive)->index << 1) + drive->select.b.unit;
-	spin_lock_irqsave(&ide_lock, flags);
+	spin_lock_irqsave(&ali14xx_lock, flags);
 	outb_p(regOn, basePort);
 	outReg(param1, regTab[driveNum].reg1);
 	outReg(param2, regTab[driveNum].reg2);
 	outReg(param3, regTab[driveNum].reg3);
 	outReg(param4, regTab[driveNum].reg4);
 	outb_p(regOff, basePort);
-	spin_unlock_irqrestore(&ide_lock, flags);
+	spin_unlock_irqrestore(&ali14xx_lock, flags);
 }
 
 /*