hwmon: (nct6775) Fix non-existent ALARM warning

Skip non-existent ALARM attribute to avoid a shift-out-of-bounds
dmesg warning.

Reported-by: Doug Smythies <dsmythies@telus.net>
Closes: https://lore.kernel.org/linux-hwmon/ZQVzdlHgWdFhOVyQ@debian.me/T/#mc69b690660eb50734a6b07506d74a119e0266f1b
Fixes: b7f1f7b2523a ("hwmon: (nct6775) Additional TEMP registers for nct6799")
Signed-off-by: Ahmad Khalifa <ahmad@khalifa.ws>
Link: https://lore.kernel.org/r/20230918184722.2033225-1-ahmad@khalifa.ws
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

diff --git a/drivers/hwmon/nct6775-core.c b/drivers/hwmon/nct6775-core.c
index 02a7124..b5b81bd 100644 (file)
--- a/drivers/hwmon/nct6775-core.c
+++ b/drivers/hwmon/nct6775-core.c
@@ -1910,6 +1910,10 @@ static umode_t nct6775_in_is_visible(struct kobject *kobj,
        struct device *dev = kobj_to_dev(kobj);
        struct nct6775_data *data = dev_get_drvdata(dev);
        int in = index / 5;     /* voltage index */
+       int nr = index % 5;     /* attribute index */
+
+       if (nr == 1 && data->ALARM_BITS[in] == -1)
+               return 0;
 
        if (!(data->have_in & BIT(in)))
                return 0;