commit 21fb9f0d5e91 ("Input: twl6040-vibra - use system workqueue")
says that it switches to use the system workqueue but it did neither
- remove the workqueue struct variable
- replace code to really use the system workqueue
Instead it calls queue_work() on uninitialized info->workqueue.
The result is a NULL pointer dereference in vibra_play().
Solution: use schedule_work
Signed-off-by: H. Nikolaus Schaller <hns@xxxxxxxxxxxxx>
---
drivers/input/misc/twl6040-vibra.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/drivers/input/misc/twl6040-vibra.c b/drivers/input/misc/twl6040-vibra.c
index 1e9902d..3805129 100644
--- a/drivers/input/misc/twl6040-vibra.c
+++ b/drivers/input/misc/twl6040-vibra.c
@@ -45,7 +45,6 @@
struct vibra_info {
struct device *dev;
struct input_dev *input_dev;
- struct workqueue_struct *workqueue;
struct work_struct play_work;
struct mutex mutex;
int irq;
@@ -213,7 +212,7 @@ static int vibra_play(struct input_dev *input, void *data,
info->strong_speed = effect->u.rumble.strong_magnitude;
info->direction = effect->direction < EFFECT_DIR_180_DEG ? 1 : -1;
- ret = queue_work(info->workqueue, &info->play_work);
+ ret = schedule_work(&info->play_work);
if (!ret) {
dev_info(&input->dev, "work is already on queue\n");
return ret;
--
2.7.3
--
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