hwmon: (w83627ehf) Fix broken driver init

commit bfa02b0da66965caf46e441270af87edda4fea14 upstream.

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>
Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/hwmon/w83627ehf.c b/drivers/hwmon/w83627ehf.c
index 7be763df2d80dff9219ef62caa1cad5e227928c9..4b2fc50c84feb5870524fe9021f28b74c3fb2d83 100644 (file)
--- a/drivers/hwmon/w83627ehf.c
+++ b/drivers/hwmon/w83627ehf.c
@@ -1756,12 +1756,15 @@ 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;