rng: lock global variable before accessing.



Changes done to lock mutex before accessing global variable
to avoid any race condition.

Change-Id: Ia32ab856b4d3a2326c1b004341b40d72b81c5d5b
Signed-off-by: Neeraj Soni <neersoni@codeaurora.org>

parent f762adc5

drivers/char/hw_random/core.c

+5 −1

Original line number	Diff line number	Diff line
		@@ -346,8 +346,12 @@ static int hwrng_fillfn(void *unused)
		long rc;

		while (!kthread_should_stop()) {
		if (!current_rng)
		mutex_lock(&rng_mutex);
		if (!current_rng) {
		mutex_unlock(&rng_mutex);
		break;
		}
		mutex_unlock(&rng_mutex);
		rc = rng_get_data(current_rng, rng_fillbuf,
		rng_buffer_size(), 1);
		if (rc <= 0) {