hwmon: (s3c-hwmon) Ignore invalid divider settings

Avoid registering channels that have zero divider settings in them, as this
will only lead to kernel OOPS from divide-by-zero when the sysfs entry is
read.

Signed-off-by: Ben Dooks <ben@simtec.co.uk>
Signed-off-by: Jean Delvare <khali@linux-fr.org>

1 files changed, 9 insertions, 2 deletions

diff --git a/drivers/hwmon/s3c-hwmon.c b/drivers/hwmon/s3c-hwmon.c
index 3a524f2fe49..71835412529 100644
--- a/drivers/hwmon/s3c-hwmon.c
+++ b/drivers/hwmon/s3c-hwmon.c
@@ -323,14 +323,21 @@ static int __devinit s3c_hwmon_probe(struct platform_device *dev)
         }
 
         for (i = 0; i < ARRAY_SIZE(pdata->in); i++) {
-                if (!pdata->in[i])
+                struct s3c24xx_adc_hwmon_incfg *cfg = pdata->in[i];
+
+                if (!cfg)
                         continue;
 
-                if (pdata->in[i]->mult >= 0x10000)
+                if (cfg->mult >= 0x10000)
                         dev_warn(&dev->dev,
                                  "channel %d multiplier too large\n",
                                  i);
 
+                if (cfg->divider == 0) {
+                        dev_err(&dev->dev, "channel %d divider zero\n", i);
+                        continue;
+                }
+
                 ret = s3c_hwmon_create_attr(&dev->dev, pdata->in[i],
                                             &hwmon->attrs[i], i);
                 if (ret) {