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Subject[PATCH v5 3/3] 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>
---
Changes in v5:
- Change spin lock calls to mutex lock calls.
- Modify the title description.

drivers/counter/104-quad-8.c | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/drivers/counter/104-quad-8.c b/drivers/counter/104-quad-8.c
index 9dab190..b268165 100644
--- a/drivers/counter/104-quad-8.c
+++ b/drivers/counter/104-quad-8.c
@@ -1230,6 +1230,8 @@ 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 */
@@ -1240,6 +1242,8 @@ 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;
}

--
2.7.4
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