Messages in this thread Patch in this message | | | Date | Mon, 16 Mar 2020 18:20:46 +0530 | From | Syed Nayyar Waris <> | Subject | [PATCH v5 3/3] 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> --- 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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