[PATCH 01/27] cbus: tahvo: convert spinlock into mutex

[Felipe Balbi <balbi@xxxxxx>]

GPIO operations can sleep, so move to a
mutex.

Signed-off-by: Felipe Balbi <balbi@xxxxxx>
---
 drivers/cbus/tahvo.c |   19 +++++++++----------
 1 files changed, 9 insertions(+), 10 deletions(-)

diff --git a/drivers/cbus/tahvo.c b/drivers/cbus/tahvo.c
index d4a89a6..bc3ca6d 100644
--- a/drivers/cbus/tahvo.c
+++ b/drivers/cbus/tahvo.c
@@ -32,6 +32,7 @@
 #include <linux/irq.h>
 #include <linux/interrupt.h>
 #include <linux/platform_device.h>
+#include <linux/mutex.h>
 
 #include "cbus.h"
 #include "tahvo.h"
@@ -43,7 +44,7 @@ static int tahvo_initialized;
 static int tahvo_is_betty;
 
 static struct tasklet_struct tahvo_tasklet;
-static DEFINE_SPINLOCK(tahvo_lock);
+static struct mutex tahvo_lock;
 
 static struct device *the_dev;
 
@@ -97,15 +98,14 @@ EXPORT_SYMBOL(tahvo_write_reg);
  */
 void tahvo_set_clear_reg_bits(unsigned reg, u16 set, u16 clear)
 {
-	unsigned long flags;
 	u16 w;
 
-	spin_lock_irqsave(&tahvo_lock, flags);
+	mutex_lock(&tahvo_lock);
 	w = tahvo_read_reg(reg);
 	w &= ~clear;
 	w |= set;
 	tahvo_write_reg(reg, w);
-	spin_unlock_irqrestore(&tahvo_lock, flags);
+	mutex_unlock(&tahvo_lock);
 }
 
 /*
@@ -113,14 +113,13 @@ void tahvo_set_clear_reg_bits(unsigned reg, u16 set, u16 clear)
  */
 void tahvo_disable_irq(int id)
 {
-	unsigned long flags;
 	u16 mask;
 
-	spin_lock_irqsave(&tahvo_lock, flags);
+	mutex_lock(&tahvo_lock);
 	mask = tahvo_read_reg(TAHVO_REG_IMR);
 	mask |= 1 << id;
 	tahvo_write_reg(TAHVO_REG_IMR, mask);
-	spin_unlock_irqrestore(&tahvo_lock, flags);
+	mutex_unlock(&tahvo_lock);
 }
 EXPORT_SYMBOL(tahvo_disable_irq);
 
@@ -129,14 +128,13 @@ EXPORT_SYMBOL(tahvo_disable_irq);
  */
 void tahvo_enable_irq(int id)
 {
-	unsigned long flags;
 	u16 mask;
 
-	spin_lock_irqsave(&tahvo_lock, flags);
+	mutex_lock(&tahvo_lock);
 	mask = tahvo_read_reg(TAHVO_REG_IMR);
 	mask &= ~(1 << id);
 	tahvo_write_reg(TAHVO_REG_IMR, mask);
-	spin_unlock_irqrestore(&tahvo_lock, flags);
+	mutex_unlock(&tahvo_lock);
 }
 EXPORT_SYMBOL(tahvo_enable_irq);
 
@@ -297,6 +295,7 @@ static int __init tahvo_probe(struct platform_device *pdev)
 	int rev, id, ret;
 	int irq;
 
+	mutex_init(&tahvo_lock);
 	the_dev = &pdev->dev;
 
 	/* Prepare tasklet */
-- 
1.7.6.396.ge0613

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