linux-kernel - Re: [PATCH 1/3] power/ab8500_charger: harden platform data check

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Date:	Sat, 28 Apr 2012 17:38:13 +0100
From:	Lee Jones <lee.jones@...aro.org>
To:	Linus Walleij <linus.walleij@...aro.org>
CC:	Anton Vorontsov <anton.vorontsov@...aro.org>,
	linux-kernel@...r.kernel.org,
	Karl Komierowski <karl.komierowski@...ricsson.com>,
	Arun Murthy <arun.murthy@...ricsson.com>
Subject: Re: [PATCH 1/3] power/ab8500_charger: harden platform data check

Find my version of the 3 patches below.

These also clean up some ugliness and brings the variable initialisation 
formatting more into line with other drivers. If you like them I can 
officially send them to the MLs as patches.

Your call of course.

On 28/04/12 13:59, Linus Walleij wrote:
> On Fri, Apr 13, 2012 at 10:15 AM, Linus Walleij
> <linus.walleij@...ricsson.com>  wrote:
> 
>> From: Linus Walleij<linus.walleij@...aro.org>
>>
>> If no platform data at all is supplied the driver crashes,
>> extend the checks to be more careful so we can compile in the
>> driver and boot also without platform data present.
>>
>> Cc: Arun Murthy<arun.murthy@...ricsson.com>
>> Signed-off-by: Linus Walleij<linus.walleij@...aro.org>
> 
> Anton have you picked these three patches for the -rc:s?
> 
> It seems Lee Jones is facing the problems so would be nice to
> have this upstream.
> 
> Yours,
> Linus Walleij

diff --git a/drivers/power/ab8500_btemp.c b/drivers/power/ab8500_btemp.c
index d8bb993..a2ebcb4 100644
--- a/drivers/power/ab8500_btemp.c
+++ b/drivers/power/ab8500_btemp.c
@@ -964,10 +964,15 @@ static int __devinit ab8500_btemp_probe(struct platform_device *pdev)
 {
 	int irq, i, ret = 0;
 	u8 val;
-	struct abx500_bm_plat_data *plat_data;
+	struct abx500_bm_plat_data *plat_data = pdev->dev.platform_data;
+	struct ab8500_btemp *di;
+
+	if (!plat_data) {
+		dev_err(&pdev->dev, "No platform data\n");
+		return -EINVAL;
+	}
 
-	struct ab8500_btemp *di =
-		kzalloc(sizeof(struct ab8500_btemp), GFP_KERNEL);
+	di = kzalloc(sizeof(struct ab8500_btemp), GFP_KERNEL);
 	if (!di)
 		return -ENOMEM;
 
@@ -977,7 +982,6 @@ static int __devinit ab8500_btemp_probe(struct platform_device *pdev)
 	di->gpadc = ab8500_gpadc_get("ab8500-gpadc.0");
 
 	/* get btemp specific platform data */
-	plat_data = pdev->dev.platform_data;
 	di->pdata = plat_data->btemp;
 	if (!di->pdata) {
 		dev_err(di->dev, "no btemp platform data supplied\n");

##############################################################################

diff --git a/drivers/power/ab8500_charger.c b/drivers/power/ab8500_charger.c
index e2b4acc..a4e37a8 100644
--- a/drivers/power/ab8500_charger.c
+++ b/drivers/power/ab8500_charger.c
@@ -2534,10 +2534,15 @@ static int __devexit ab8500_charger_remove(struct platform_device *pdev)
 static int __devinit ab8500_charger_probe(struct platform_device *pdev)
 {
 	int irq, i, charger_status, ret = 0;
-	struct abx500_bm_plat_data *plat_data;
+	struct abx500_bm_plat_data *plat_data = pdev->dev.platform_data;
+	struct ab8500_charger *di;
 
-	struct ab8500_charger *di =
-		kzalloc(sizeof(struct ab8500_charger), GFP_KERNEL);
+	if (!plat_data) {
+		dev_err(&pdev->dev, "No platform data\n");
+		return -EINVAL;
+	}
+
+	di = kzalloc(sizeof(struct ab8500_charger), GFP_KERNEL);
 	if (!di)
 		return -ENOMEM;
 
@@ -2550,7 +2555,6 @@ static int __devinit ab8500_charger_probe(struct platform_device *pdev)
 	spin_lock_init(&di->usb_state.usb_lock);
 
 	/* get charger specific platform data */
-	plat_data = pdev->dev.platform_data;
 	di->pdata = plat_data->charger;
 
 	if (!di->pdata) {

##############################################################################

diff --git a/drivers/power/ab8500_fg.c b/drivers/power/ab8500_fg.c
index c22f2f0..d88bc47 100644
--- a/drivers/power/ab8500_fg.c
+++ b/drivers/power/ab8500_fg.c
@@ -2446,10 +2446,15 @@ static int __devinit ab8500_fg_probe(struct platform_device *pdev)
 {
 	int i, irq;
 	int ret = 0;
-	struct abx500_bm_plat_data *plat_data;
+	struct abx500_bm_plat_data *plat_data = pdev->dev.platform_data;
+	struct ab8500_fg *di;
+
+	if (!plat_data) {
+		dev_err(&pdev->dev, "No platform data\n");
+		return -EINVAL;
+	}
 
-	struct ab8500_fg *di =
-		kzalloc(sizeof(struct ab8500_fg), GFP_KERNEL);
+	di = kzalloc(sizeof(struct ab8500_fg), GFP_KERNEL);
 	if (!di)
 		return -ENOMEM;
 
@@ -2461,7 +2466,6 @@ static int __devinit ab8500_fg_probe(struct platform_device *pdev)
 	di->gpadc = ab8500_gpadc_get("ab8500-gpadc.0");
 
 	/* get fg specific platform data */
-	plat_data = pdev->dev.platform_data;
 	di->pdata = plat_data->fg;
 	if (!di->pdata) {
 		dev_err(di->dev, "no fg platform data supplied\n");
-- 
1.7.9.1
--
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