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

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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: de65d05563 ("counter: 104-quad-8: Support Filter Clock Prescaler")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Syed Nayyar Waris 2020-03-16 18:20:46 +05:30 committed by Jonathan Cameron
parent 708d989328
commit d5ed76adb9
1 changed files with 4 additions and 0 deletions
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4
drivers/counter/104-quad-8.c
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@ -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;
}