ide: use mutex instead of ide_cfg_sem semaphore in IDE driver

The IDE driver uses a semaphore as mutex.
Use the mutex API instead of the (binary) semaphore.
Signed-off-by: Matthias Kaehlcke <matthias.kaehlcke@gmail.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

drivers/ide/ide-probe.c

@@ -1025,7 +1025,7 @@ static int init_irq (ide_hwif_t *hwif)
 	BUG_ON(irqs_disabled());	
 	BUG_ON(hwif == NULL);
 
-	down(&ide_cfg_sem);
+	mutex_lock(&ide_cfg_mtx);
 	hwif->hwgroup = NULL;
 #if MAX_HWIFS > 1
 	/*
@@ -1154,7 +1154,7 @@ static int init_irq (ide_hwif_t *hwif)
 		printk(" (%sed with %s)",
 			hwif->sharing_irq ? "shar" : "serializ", match->name);
 	printk("\n");
-	up(&ide_cfg_sem);
+	mutex_unlock(&ide_cfg_mtx);
 	return 0;
 out_unlink:
 	spin_lock_irq(&ide_lock);
@@ -1177,7 +1177,7 @@ static int init_irq (ide_hwif_t *hwif)
 	}
 	spin_unlock_irq(&ide_lock);
 out_up:
-	up(&ide_cfg_sem);
+	mutex_unlock(&ide_cfg_mtx);
 	return 1;
 }
 

drivers/ide/ide.c

@@ -169,7 +169,7 @@ static const u8 ide_hwif_to_major[] = { IDE0_MAJOR, IDE1_MAJOR,
 static int idebus_parameter;	/* holds the "idebus=" parameter */
 static int system_bus_speed;	/* holds what we think is VESA/PCI bus speed */
 
-DECLARE_MUTEX(ide_cfg_sem);
+DEFINE_MUTEX(ide_cfg_mtx);
  __cacheline_aligned_in_smp DEFINE_SPINLOCK(ide_lock);
 
 #ifdef CONFIG_IDEPCI_PCIBUS_ORDER
@@ -564,7 +564,7 @@ void ide_unregister(unsigned int index)
 {
 	ide_drive_t *drive;
 	ide_hwif_t *hwif, *g;
-	static ide_hwif_t tmp_hwif; /* protected by ide_cfg_sem */
+	static ide_hwif_t tmp_hwif; /* protected by ide_cfg_mtx */
 	ide_hwgroup_t *hwgroup;
 	int irq_count = 0, unit;
 
@@ -572,7 +572,7 @@ void ide_unregister(unsigned int index)
 
 	BUG_ON(in_interrupt());
 	BUG_ON(irqs_disabled());
-	down(&ide_cfg_sem);
+	mutex_lock(&ide_cfg_mtx);
 	spin_lock_irq(&ide_lock);
 	hwif = &ide_hwifs[index];
 	if (!hwif->present)
@@ -679,7 +679,7 @@ void ide_unregister(unsigned int index)
 
 abort:
 	spin_unlock_irq(&ide_lock);
-	up(&ide_cfg_sem);
+	mutex_unlock(&ide_cfg_mtx);
 }
 
 EXPORT_SYMBOL(ide_unregister);

include/linux/ide.h

@@ -1382,11 +1382,11 @@ extern const ide_pio_timings_t ide_pio_timings[6];
 
 
 extern spinlock_t ide_lock;
-extern struct semaphore ide_cfg_sem;
+extern struct mutex ide_cfg_mtx;
 /*
  * Structure locking:
  *
- * ide_cfg_sem and ide_lock together protect changes to
+ * ide_cfg_mtx and ide_lock together protect changes to
  * ide_hwif_t->{next,hwgroup}
  * ide_drive_t->next
  *