hwmon: (w83627ehf) Fix broken driver init

Commit 2265cef2 (hwmon: (w83627ehf) Properly report PECI and AMD-SI
sensor types) results in kernel panic if data->temp_label was not
initialized.
The problem was found with chip W83627DHG-P.

Add check if data->temp->label was set before use.

Based on incomplete patch by Alexander Beregalov.

Reported-by: Alexander Beregalov <a.beregalov@gmail.com>
Tested-by: Alexander Beregalov <a.beregalov@gmail.com>
Cc: stable@kernel.org
Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>

1 files changed, 6 insertions, 3 deletions

diff --git a/drivers/hwmon/w83627ehf.c b/drivers/hwmon/w83627ehf.c
index 483cb268781e..93f5fc7d6059 100644
--- a/drivers/hwmon/w83627ehf.c
+++ b/drivers/hwmon/w83627ehf.c
@@ -1835,12 +1835,15 @@ static inline void __devinit w83627ehf_init_device(struct w83627ehf_data *data,
                 diode = 0x70;
         }
         for (i = 0; i < 3; i++) {
-                const char *label = data->temp_label[data->temp_src[i]];
+                const char *label = NULL;
+
+                if (data->temp_label)
+                        label = data->temp_label[data->temp_src[i]];
 
                 /* Digital source overrides analog type */
-                if (strncmp(label, "PECI", 4) == 0)
+                if (label && strncmp(label, "PECI", 4) == 0)
                         data->temp_type[i] = 6;
-                else if (strncmp(label, "AMD", 3) == 0)
+                else if (label && strncmp(label, "AMD", 3) == 0)
                         data->temp_type[i] = 5;
                 else if ((tmp & (0x02 << i)))
                         data->temp_type[i] = (diode & (0x10 << i)) ? 1 : 3;