del_timer() does not wait until the timer handler finishing.
This means that the timer handler may still be running after
the driver's remove function has finished, which would result
in a use-after-free.
Fix it by calling del_timer_sync(), which makes sure the timer
handler has finished.
Reported-by: NHulk Robot <hulkci@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>
Reviewed-by: NDipen Patel <dipenp@nvidia.com>
Acked-by: NDipen Patel <dipenp@nvidia.com>
Signed-off-by: NThierry Reding <treding@nvidia.com>