diff options
| -rw-r--r-- | drivers/hwmon/bt1-pvt.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/drivers/hwmon/bt1-pvt.c b/drivers/hwmon/bt1-pvt.c index 2600426a3b21..3e1d56585b91 100644 --- a/drivers/hwmon/bt1-pvt.c +++ b/drivers/hwmon/bt1-pvt.c @@ -477,6 +477,7 @@ static int pvt_read_data(struct pvt_hwmon *pvt, enum pvt_sensor_type type, long *val) { struct pvt_cache *cache = &pvt->cache[type]; + unsigned long timeout; u32 data; int ret; @@ -500,7 +501,14 @@ static int pvt_read_data(struct pvt_hwmon *pvt, enum pvt_sensor_type type, pvt_update(pvt->regs + PVT_INTR_MASK, PVT_INTR_DVALID, 0); pvt_update(pvt->regs + PVT_CTRL, PVT_CTRL_EN, PVT_CTRL_EN); - wait_for_completion(&cache->conversion); + /* + * Wait with timeout since in case if the sensor is suddenly powered + * down the request won't be completed and the caller will hang up on + * this procedure until the power is back up again. Multiply the + * timeout by the factor of two to prevent a false timeout. + */ + timeout = 2 * usecs_to_jiffies(ktime_to_us(pvt->timeout)); + ret = wait_for_completion_timeout(&cache->conversion, timeout); pvt_update(pvt->regs + PVT_CTRL, PVT_CTRL_EN, 0); pvt_update(pvt->regs + PVT_INTR_MASK, PVT_INTR_DVALID, @@ -510,6 +518,9 @@ static int pvt_read_data(struct pvt_hwmon *pvt, enum pvt_sensor_type type, mutex_unlock(&pvt->iface_mtx); + if (!ret) + return -ETIMEDOUT; + if (type == PVT_TEMP) *val = pvt_calc_poly(&poly_N_to_temp, data); else |