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| author | Syed Nayyar Waris <syednwaris@gmail.com> | 2020-03-16 18:20:46 +0530 |
|---|---|---|
| committer | Jonathan Cameron <Jonathan.Cameron@huawei.com> | 2020-06-14 14:46:52 +0100 |
| commit | d5ed76adb926a90fada98f518abc1ab6ef07d28f (patch) | |
| tree | a3b3c3651094b7546273cd4b09d54735354ad3ef /drivers/counter | |
| parent | 708d98932893cea609386cefdfd190f757f5a61c (diff) | |
| download | linux-d5ed76adb926a90fada98f518abc1ab6ef07d28f.tar.gz linux-d5ed76adb926a90fada98f518abc1ab6ef07d28f.tar.bz2 linux-d5ed76adb926a90fada98f518abc1ab6ef07d28f.zip | |
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: de65d0556343 ("counter: 104-quad-8: Support Filter Clock Prescaler")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Diffstat (limited to 'drivers/counter')
| -rw-r--r-- | drivers/counter/104-quad-8.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/counter/104-quad-8.c b/drivers/counter/104-quad-8.c index 9364dc188f8f..d22cfae1b019 100644 --- a/drivers/counter/104-quad-8.c +++ b/drivers/counter/104-quad-8.c @@ -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; } |