The mrst_max3110 driver had a set of unsafe wakeup sequences
along the following line:
if (!atomic_read(&foo)) {
atomic_set(&foo, 1);
wake_up(worker_thread);
}
and the worker thread would do
if (atomic_read(&foo)) {
do_work();
atomic_set(&foo, 0);
}
which can result in various missed wakups due to test-then-set races,
as well as due to clear-after-work instead of clear-before-work.
This patch fixes these races by using the proper bit test-and-set operations,
and by doing clear-before-work.
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
d6e679b474