drivers/gpio/pca953x.c: add a mutex to fix race condition

Add a mutex to register communication and handling.  Without the mutex,
GPIOs didn't switch as expected when toggled in a fast sequence of
status changes of multiple outputs.

Signed-off-by: Roland Stigge <stigge@antcom.de>
Acked-by: Eric Miao <eric.y.miao@gmail.com>
Cc: Grant Likely <grant.likely@secretlab.ca>
Cc: Marc Zyngier <maz@misterjones.org>
Cc: Ben Gardner <bgardner@wabtec.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/gpio/pca953x.c b/drivers/gpio/pca953x.c
index a261972..b473429 100644 (file)
--- a/drivers/gpio/pca953x.c
+++ b/drivers/gpio/pca953x.c
@@ -60,6 +60,7 @@ struct pca953x_chip {
        unsigned gpio_start;
        uint16_t reg_output;
        uint16_t reg_direction;
+       struct mutex i2c_lock;
 
 #ifdef CONFIG_GPIO_PCA953X_IRQ
        struct mutex irq_lock;
@@ -119,13 +120,17 @@ static int pca953x_gpio_direction_input(struct gpio_chip *gc, unsigned off)
 
        chip = container_of(gc, struct pca953x_chip, gpio_chip);
 
+       mutex_lock(&chip->i2c_lock);
        reg_val = chip->reg_direction | (1u << off);
        ret = pca953x_write_reg(chip, PCA953X_DIRECTION, reg_val);
        if (ret)
-               return ret;
+               goto exit;
 
        chip->reg_direction = reg_val;
-       return 0;
+       ret = 0;
+exit:
+       mutex_unlock(&chip->i2c_lock);
+       return ret;
 }
 
 static int pca953x_gpio_direction_output(struct gpio_chip *gc,
@@ -137,6 +142,7 @@ static int pca953x_gpio_direction_output(struct gpio_chip *gc,
 
        chip = container_of(gc, struct pca953x_chip, gpio_chip);
 
+       mutex_lock(&chip->i2c_lock);
        /* set output level */
        if (val)
                reg_val = chip->reg_output | (1u << off);
@@ -145,7 +151,7 @@ static int pca953x_gpio_direction_output(struct gpio_chip *gc,
 
        ret = pca953x_write_reg(chip, PCA953X_OUTPUT, reg_val);
        if (ret)
-               return ret;
+               goto exit;
 
        chip->reg_output = reg_val;
 
@@ -153,10 +159,13 @@ static int pca953x_gpio_direction_output(struct gpio_chip *gc,
        reg_val = chip->reg_direction & ~(1u << off);
        ret = pca953x_write_reg(chip, PCA953X_DIRECTION, reg_val);
        if (ret)
-               return ret;
+               goto exit;
 
        chip->reg_direction = reg_val;
-       return 0;
+       ret = 0;
+exit:
+       mutex_unlock(&chip->i2c_lock);
+       return ret;
 }
 
 static int pca953x_gpio_get_value(struct gpio_chip *gc, unsigned off)
@@ -167,7 +176,9 @@ static int pca953x_gpio_get_value(struct gpio_chip *gc, unsigned off)
 
        chip = container_of(gc, struct pca953x_chip, gpio_chip);
 
+       mutex_lock(&chip->i2c_lock);
        ret = pca953x_read_reg(chip, PCA953X_INPUT, &reg_val);
+       mutex_unlock(&chip->i2c_lock);
        if (ret < 0) {
                /* NOTE:  diagnostic already emitted; that's all we should
                 * do unless gpio_*_value_cansleep() calls become different
@@ -187,6 +198,7 @@ static void pca953x_gpio_set_value(struct gpio_chip *gc, unsigned off, int val)
 
        chip = container_of(gc, struct pca953x_chip, gpio_chip);
 
+       mutex_lock(&chip->i2c_lock);
        if (val)
                reg_val = chip->reg_output | (1u << off);
        else
@@ -194,9 +206,11 @@ static void pca953x_gpio_set_value(struct gpio_chip *gc, unsigned off, int val)
 
        ret = pca953x_write_reg(chip, PCA953X_OUTPUT, reg_val);
        if (ret)
-               return;
+               goto exit;
 
        chip->reg_output = reg_val;
+exit:
+       mutex_unlock(&chip->i2c_lock);
 }
 
 static void pca953x_setup_gpio(struct pca953x_chip *chip, int gpios)
@@ -517,6 +531,8 @@ static int __devinit pca953x_probe(struct i2c_client *client,
 
        chip->names = pdata->names;
 
+       mutex_init(&chip->i2c_lock);
+
        /* initialize cached registers from their original values.
         * we can't share this chip with another i2c master.
         */