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mfd/88pm860x: fix uninitialized variable and clean up

PATCH In review Dan Carpenter 3 participants 3 messages May 26, 2010 – Jun 18, 2010

Subsystems (2)
Kernel janitors Multifunction devices (MFD)
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Dan Carpenter

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#0 lore raw

PATCH 1/1 mfd/88pm860x: fix uninitialized variable and clean up

The original code had a compile warning:
drivers/mfd/88pm860x-core.c:431: warning: ‘ret’ may be used
uninitialized in this function
It seems like the warning is valid if either pdata or pdata->touch is NULL.

This patch checks pdata and pdata->touch at the beginning of the function. That means everything can be pulled in one indent level. Now all the statements fit within the 80 character limit.

Also at that point the "use_gpadc" variable isn't needed and removing it simplifies the logic.

Signed-off-by Dan Carpenter <[email protected]>
drivers/mfd/88pm860x-core.c +32 -40
index 405d2d5..f9ada69 100644
@@ -428,52 +428,44 @@ static int __devinit device_gpadc_init(struct pm860x_chip *chip,
 {
 	struct i2c_client *i2c = (chip->id = CHIP_PM8607) ? chip->client \
 				: chip->companion;
-	int use_gpadc = 0, data, ret;
+	int data;
+	int ret;
 
 	/* initialize GPADC without activating it */
 
-	if (pdata && pdata->touch) {
-		/* set GPADC MISC1 register */
-		data = 0;
-		data |= (pdata->touch->gpadc_prebias << 1)
-			& PM8607_GPADC_PREBIAS_MASK;
-		data |= (pdata->touch->slot_cycle << 3)
-			& PM8607_GPADC_SLOT_CYCLE_MASK;
-		data |= (pdata->touch->off_scale << 5)
-			& PM8607_GPADC_OFF_SCALE_MASK;
-		data |= (pdata->touch->sw_cal << 7)
-			& PM8607_GPADC_SW_CAL_MASK;
-		if (data) {
-			ret = pm860x_reg_write(i2c, PM8607_GPADC_MISC1, data);
-			if (ret < 0)
-				goto out;
-		}
-		/* set tsi prebias time */
-		if (pdata->touch->tsi_prebias) {
-			data = pdata->touch->tsi_prebias;
-			ret = pm860x_reg_write(i2c, PM8607_TSI_PREBIAS, data);
-			if (ret < 0)
-				goto out;
-		}
-		/* set prebias & prechg time of pen detect */
-		data = 0;
-		data |= pdata->touch->pen_prebias & PM8607_PD_PREBIAS_MASK;
-		data |= (pdata->touch->pen_prechg << 5)
-			& PM8607_PD_PRECHG_MASK;
-		if (data) {
-			ret = pm860x_reg_write(i2c, PM8607_PD_PREBIAS, data);
-			if (ret < 0)
-				goto out;
-		}
+	if (!pdata || !pdata->touch)
+		return -EINVAL;
 
-		use_gpadc = 1;
+	/* set GPADC MISC1 register */
+	data = 0;
+	data |= (pdata->touch->gpadc_prebias << 1) & PM8607_GPADC_PREBIAS_MASK;
+	data |= (pdata->touch->slot_cycle << 3) & PM8607_GPADC_SLOT_CYCLE_MASK;
+	data |= (pdata->touch->off_scale << 5) & PM8607_GPADC_OFF_SCALE_MASK;
+	data |= (pdata->touch->sw_cal << 7) & PM8607_GPADC_SW_CAL_MASK;
+	if (data) {
+		ret = pm860x_reg_write(i2c, PM8607_GPADC_MISC1, data);
+		if (ret < 0)
+			goto out;
 	}
-
-	/* turn on GPADC */
-	if (use_gpadc) {
-		ret = pm860x_set_bits(i2c, PM8607_GPADC_MISC1,
-				      PM8607_GPADC_EN, PM8607_GPADC_EN);
+	/* set tsi prebias time */
+	if (pdata->touch->tsi_prebias) {
+		data = pdata->touch->tsi_prebias;
+		ret = pm860x_reg_write(i2c, PM8607_TSI_PREBIAS, data);
+		if (ret < 0)
+			goto out;
 	}
+	/* set prebias & prechg time of pen detect */
+	data = 0;
+	data |= pdata->touch->pen_prebias & PM8607_PD_PREBIAS_MASK;
+	data |= (pdata->touch->pen_prechg << 5) & PM8607_PD_PRECHG_MASK;
+	if (data) {
+		ret = pm860x_reg_write(i2c, PM8607_PD_PREBIAS, data);
+		if (ret < 0)
+			goto out;
+	}
+
+	ret = pm860x_set_bits(i2c, PM8607_GPADC_MISC1,
+			      PM8607_GPADC_EN, PM8607_GPADC_EN);
 out:
 	return ret;
 }
#1 lore raw

I'm OK on this patch.

Thanks
Haojian

-----Original Message-----
From: Dan Carpenter [mailto:[email protected]]
Sent: 2010年5月27日 6:54 AM
To: Samuel Ortiz
Cc: Haojian Zhuang; Mark Brown; Liam Girdwood; [email protected]; [email protected]
Subject: [patch] mfd/88pm860x: fix uninitialized variable and clean up

The original code had a compile warning:
drivers/mfd/88pm860x-core.c:431: warning: ‘ret’ may be used
uninitialized in this function
It seems like the warning is valid if either pdata or pdata->touch is NULL.

This patch checks pdata and pdata->touch at the beginning of the function. That means everything can be pulled in one indent level. Now all the statements fit within the 80 character limit.

Also at that point the "use_gpadc" variable isn't needed and removing it simplifies the logic.

Signed-off-by Dan Carpenter <[email protected]>
drivers/mfd/88pm860x-core.c +32 -40
index 405d2d5..f9ada69 100644
@@ -428,52 +428,44 @@ static int __devinit device_gpadc_init(struct pm860x_chip *chip,
 {
 	struct i2c_client *i2c = (chip->id = CHIP_PM8607) ? chip->client \
 				: chip->companion;
-	int use_gpadc = 0, data, ret;
+	int data;
+	int ret;
 
 	/* initialize GPADC without activating it */
 
-	if (pdata && pdata->touch) {
-		/* set GPADC MISC1 register */
-		data = 0;
-		data |= (pdata->touch->gpadc_prebias << 1)
-			& PM8607_GPADC_PREBIAS_MASK;
-		data |= (pdata->touch->slot_cycle << 3)
-			& PM8607_GPADC_SLOT_CYCLE_MASK;
-		data |= (pdata->touch->off_scale << 5)
-			& PM8607_GPADC_OFF_SCALE_MASK;
-		data |= (pdata->touch->sw_cal << 7)
-			& PM8607_GPADC_SW_CAL_MASK;
-		if (data) {
-			ret = pm860x_reg_write(i2c, PM8607_GPADC_MISC1, data);
-			if (ret < 0)
-				goto out;
-		}
-		/* set tsi prebias time */
-		if (pdata->touch->tsi_prebias) {
-			data = pdata->touch->tsi_prebias;
-			ret = pm860x_reg_write(i2c, PM8607_TSI_PREBIAS, data);
-			if (ret < 0)
-				goto out;
-		}
-		/* set prebias & prechg time of pen detect */
-		data = 0;
-		data |= pdata->touch->pen_prebias & PM8607_PD_PREBIAS_MASK;
-		data |= (pdata->touch->pen_prechg << 5)
-			& PM8607_PD_PRECHG_MASK;
-		if (data) {
-			ret = pm860x_reg_write(i2c, PM8607_PD_PREBIAS, data);
-			if (ret < 0)
-				goto out;
-		}
+	if (!pdata || !pdata->touch)
+		return -EINVAL;
 
-		use_gpadc = 1;
+	/* set GPADC MISC1 register */
+	data = 0;
+	data |= (pdata->touch->gpadc_prebias << 1) & PM8607_GPADC_PREBIAS_MASK;
+	data |= (pdata->touch->slot_cycle << 3) & PM8607_GPADC_SLOT_CYCLE_MASK;
+	data |= (pdata->touch->off_scale << 5) & PM8607_GPADC_OFF_SCALE_MASK;
+	data |= (pdata->touch->sw_cal << 7) & PM8607_GPADC_SW_CAL_MASK;
+	if (data) {
+		ret = pm860x_reg_write(i2c, PM8607_GPADC_MISC1, data);
+		if (ret < 0)
+			goto out;
 	}
-
-	/* turn on GPADC */
-	if (use_gpadc) {
-		ret = pm860x_set_bits(i2c, PM8607_GPADC_MISC1,
-				      PM8607_GPADC_EN, PM8607_GPADC_EN);
+	/* set tsi prebias time */
+	if (pdata->touch->tsi_prebias) {
+		data = pdata->touch->tsi_prebias;
+		ret = pm860x_reg_write(i2c, PM8607_TSI_PREBIAS, data);
+		if (ret < 0)
+			goto out;
 	}
+	/* set prebias & prechg time of pen detect */
+	data = 0;
+	data |= pdata->touch->pen_prebias & PM8607_PD_PREBIAS_MASK;
+	data |= (pdata->touch->pen_prechg << 5) & PM8607_PD_PRECHG_MASK;
+	if (data) {
+		ret = pm860x_reg_write(i2c, PM8607_PD_PREBIAS, data);
+		if (ret < 0)
+			goto out;
+	}
+
+	ret = pm860x_set_bits(i2c, PM8607_GPADC_MISC1,
+			      PM8607_GPADC_EN, PM8607_GPADC_EN);
 out:
 	return ret;
 }

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#2 lore raw
In reply to Dan Carpenter

Hi Dan,

Quoted 6 lines · Dan Carpenter

The original code had a compile warning:
drivers/mfd/88pm860x-core.c:431: warning: ‘ret’ may be used
uninitialized in this function
It seems like the warning is valid if either pdata or pdata->touch is NULL.

Quoted 6 lines

This patch checks pdata and pdata->touch at the beginning of the function. That means everything can be pulled in one indent level. Now all the statements fit within the 80 character limit.

Also at that point the "use_gpadc" variable isn't needed and removing it simplifies the logic.

Thanks, patch applied to my for-next branch.

Cheers,
Samuel.

Quoted 91 lines
Signed-off-by Dan Carpenter <[email protected]>
drivers/mfd/88pm860x-core.c +32 -40
index 405d2d5..f9ada69 100644
@@ -428,52 +428,44 @@ static int __devinit device_gpadc_init(struct pm860x_chip *chip,
 {
 	struct i2c_client *i2c = (chip->id = CHIP_PM8607) ? chip->client \
 				: chip->companion;
-	int use_gpadc = 0, data, ret;
+	int data;
+	int ret;
 
 	/* initialize GPADC without activating it */
 
-	if (pdata && pdata->touch) {
-		/* set GPADC MISC1 register */
-		data = 0;
-		data |= (pdata->touch->gpadc_prebias << 1)
-			& PM8607_GPADC_PREBIAS_MASK;
-		data |= (pdata->touch->slot_cycle << 3)
-			& PM8607_GPADC_SLOT_CYCLE_MASK;
-		data |= (pdata->touch->off_scale << 5)
-			& PM8607_GPADC_OFF_SCALE_MASK;
-		data |= (pdata->touch->sw_cal << 7)
-			& PM8607_GPADC_SW_CAL_MASK;
-		if (data) {
-			ret = pm860x_reg_write(i2c, PM8607_GPADC_MISC1, data);
-			if (ret < 0)
-				goto out;
-		}
-		/* set tsi prebias time */
-		if (pdata->touch->tsi_prebias) {
-			data = pdata->touch->tsi_prebias;
-			ret = pm860x_reg_write(i2c, PM8607_TSI_PREBIAS, data);
-			if (ret < 0)
-				goto out;
-		}
-		/* set prebias & prechg time of pen detect */
-		data = 0;
-		data |= pdata->touch->pen_prebias & PM8607_PD_PREBIAS_MASK;
-		data |= (pdata->touch->pen_prechg << 5)
-			& PM8607_PD_PRECHG_MASK;
-		if (data) {
-			ret = pm860x_reg_write(i2c, PM8607_PD_PREBIAS, data);
-			if (ret < 0)
-				goto out;
-		}
+	if (!pdata || !pdata->touch)
+		return -EINVAL;
 
-		use_gpadc = 1;
+	/* set GPADC MISC1 register */
+	data = 0;
+	data |= (pdata->touch->gpadc_prebias << 1) & PM8607_GPADC_PREBIAS_MASK;
+	data |= (pdata->touch->slot_cycle << 3) & PM8607_GPADC_SLOT_CYCLE_MASK;
+	data |= (pdata->touch->off_scale << 5) & PM8607_GPADC_OFF_SCALE_MASK;
+	data |= (pdata->touch->sw_cal << 7) & PM8607_GPADC_SW_CAL_MASK;
+	if (data) {
+		ret = pm860x_reg_write(i2c, PM8607_GPADC_MISC1, data);
+		if (ret < 0)
+			goto out;
 	}
-
-	/* turn on GPADC */
-	if (use_gpadc) {
-		ret = pm860x_set_bits(i2c, PM8607_GPADC_MISC1,
-				      PM8607_GPADC_EN, PM8607_GPADC_EN);
+	/* set tsi prebias time */
+	if (pdata->touch->tsi_prebias) {
+		data = pdata->touch->tsi_prebias;
+		ret = pm860x_reg_write(i2c, PM8607_TSI_PREBIAS, data);
+		if (ret < 0)
+			goto out;
 	}
+	/* set prebias & prechg time of pen detect */
+	data = 0;
+	data |= pdata->touch->pen_prebias & PM8607_PD_PREBIAS_MASK;
+	data |= (pdata->touch->pen_prechg << 5) & PM8607_PD_PRECHG_MASK;
+	if (data) {
+		ret = pm860x_reg_write(i2c, PM8607_PD_PREBIAS, data);
+		if (ret < 0)
+			goto out;
+	}
+
+	ret = pm860x_set_bits(i2c, PM8607_GPADC_MISC1,
+			      PM8607_GPADC_EN, PM8607_GPADC_EN);
 out:
 	return ret;
 }
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