Commit d5ed76ad authored Mar 16, 2020 by Syed Nayyar Waris Committed by Jonathan Cameron Jun 14, 2020

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: Syed Nayyar Waris <syednwaris@gmail.com>
Fixes: de65d055 ("counter: 104-quad-8: Support Filter Clock Prescaler")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

parent 708d9893

drivers/counter/104-quad-8.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -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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