From: William Breathitt Gray vilhelm.gray@gmail.com
[ Upstream commit 728246e8f7269ecd35a2c6e6795323e6d8f48db7 ]
The 104-QUAD-8 only has two count modes where a ceiling value makes sense: Range Limit and Modulo-N. Outside of these two modes, setting a ceiling value is an invalid operation -- so let's report it as such by returning -EINVAL.
Fixes: fc069262261c ("counter: 104-quad-8: Add lock guards - generic interface") Acked-by: Syed Nayyar Waris syednwaris@gmail.com Signed-off-by: William Breathitt Gray vilhelm.gray@gmail.com Link: https://lore.kernel.org/r/a2147f022829b66839a1db5530a7fada47856847.162799033... Signed-off-by: Jonathan Cameron Jonathan.Cameron@huawei.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/counter/104-quad-8.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/counter/104-quad-8.c b/drivers/counter/104-quad-8.c index 09a9a77cce06..81f9642777fb 100644 --- a/drivers/counter/104-quad-8.c +++ b/drivers/counter/104-quad-8.c @@ -715,12 +715,13 @@ static ssize_t quad8_count_ceiling_write(struct counter_device *counter, case 1: case 3: quad8_preset_register_set(priv, count->id, ceiling); - break; + mutex_unlock(&priv->lock); + return len; }
mutex_unlock(&priv->lock);
- return len; + return -EINVAL; }
static ssize_t quad8_count_preset_enable_read(struct counter_device *counter,