hwmon: (w83795) Clear intrusion alarm immediately

When asked to clear the intrusion alarm, do so immediately. We have to
invalidate the cache to make sure the new status will be read. But we
also have to read from the status register once to clear the pending
alarm, as writing to CLR_CHS surprising won't clear it automatically.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Acked-by: Guenter Roeck <guenter.roeck@ericsson.com>

diff --git a/drivers/hwmon/w83795.c b/drivers/hwmon/w83795.c
index 600b2adbbd4924b140b56a92bca5812762847a66..90f4ffb357b74575859e2dcb26bc5b930b8f389b 100644 (file)
--- a/drivers/hwmon/w83795.c
+++ b/drivers/hwmon/w83795.c
@@ -755,6 +755,10 @@ store_chassis_clear(struct device *dev,
        val = w83795_read(client, W83795_REG_CLR_CHASSIS);
        val |= 0x80;
        w83795_write(client, W83795_REG_CLR_CHASSIS, val);
+
+       /* Clear status and force cache refresh */
+       w83795_read(client, W83795_REG_ALARM(5));
+       data->valid = 0;
        mutex_unlock(&data->update_lock);
        return count;
 }