mpc-i2c: Propagate error values properly

Propagate the error values returned by i2c_wait() instead of overriding
them with a meaningless -1.
Signed-off-by: Jon Smirl <jonsmirl@gmail.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>

drivers/i2c/busses/i2c-mpc.c

@@ -180,7 +180,7 @@ static void mpc_i2c_stop(struct mpc_i2c *i2c)
 static int mpc_write(struct mpc_i2c *i2c, int target,
 		     const u8 * data, int length, int restart)
 {
-	int i;
+	int i, result;
 	unsigned timeout = i2c->adap.timeout;
 	u32 flags = restart ? CCR_RSTA : 0;
 
@@ -192,15 +192,17 @@ static int mpc_write(struct mpc_i2c *i2c, int target,
 	/* Write target byte */
 	writeb((target << 1), i2c->base + MPC_I2C_DR);
 
-	if (i2c_wait(i2c, timeout, 1) < 0)
-		return -1;
+	result = i2c_wait(i2c, timeout, 1);
+	if (result < 0)
+		return result;
 
 	for (i = 0; i < length; i++) {
 		/* Write data byte */
 		writeb(data[i], i2c->base + MPC_I2C_DR);
 
-		if (i2c_wait(i2c, timeout, 1) < 0)
-			return -1;
+		result = i2c_wait(i2c, timeout, 1);
+		if (result < 0)
+			return result;
 	}
 
 	return 0;
@@ -210,7 +212,7 @@ static int mpc_read(struct mpc_i2c *i2c, int target,
 		    u8 * data, int length, int restart)
 {
 	unsigned timeout = i2c->adap.timeout;
-	int i;
+	int i, result;
 	u32 flags = restart ? CCR_RSTA : 0;
 
 	/* Start with MEN */
@@ -221,8 +223,9 @@ static int mpc_read(struct mpc_i2c *i2c, int target,
 	/* Write target address byte - this time with the read flag set */
 	writeb((target << 1) | 1, i2c->base + MPC_I2C_DR);
 
-	if (i2c_wait(i2c, timeout, 1) < 0)
-		return -1;
+	result = i2c_wait(i2c, timeout, 1);
+	if (result < 0)
+		return result;
 
 	if (length) {
 		if (length == 1)
@@ -234,8 +237,9 @@ static int mpc_read(struct mpc_i2c *i2c, int target,
 	}
 
 	for (i = 0; i < length; i++) {
-		if (i2c_wait(i2c, timeout, 0) < 0)
-			return -1;
+		result = i2c_wait(i2c, timeout, 0);
+		if (result < 0)
+			return result;
 
 		/* Generate txack on next to last byte */
 		if (i == length - 2)
@@ -320,9 +324,9 @@ static int fsl_i2c_probe(struct platform_device *pdev)
 
 	pdata = (struct fsl_i2c_platform_data *) pdev->dev.platform_data;
 
-	if (!(i2c = kzalloc(sizeof(*i2c), GFP_KERNEL))) {
+	i2c = kzalloc(sizeof(*i2c), GFP_KERNEL);
+	if (!i2c)
 		return -ENOMEM;
-	}
 
 	i2c->irq = platform_get_irq(pdev, 0);
 	if (i2c->irq < 0) {