Commit d5ed76ad authored by Syed Nayyar Waris's avatar Syed Nayyar Waris Committed by Jonathan Cameron

counter: 104-quad-8: Add lock guards - filter clock prescaler

Add lock protection from race conditions to the 104-quad-8 counter
driver for filter clock prescaler code changes. Mutex calls used for
protection.
Signed-off-by: default avatarSyed Nayyar Waris <syednwaris@gmail.com>
Fixes: de65d055 ("counter: 104-quad-8: Support Filter Clock Prescaler")
Signed-off-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
parent 708d9893
......@@ -1365,6 +1365,8 @@ static ssize_t quad8_signal_fck_prescaler_write(struct counter_device *counter,
if (ret)
return ret;
mutex_lock(&priv->lock);
priv->fck_prescaler[channel_id] = prescaler;
/* Reset Byte Pointer */
......@@ -1375,6 +1377,8 @@ static ssize_t quad8_signal_fck_prescaler_write(struct counter_device *counter,
outb(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP | QUAD8_RLD_PRESET_PSC,
base_offset + 1);
mutex_unlock(&priv->lock);
return len;
}
......
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