Revert "hwrng: core - Freeze khwrng thread during suspend"

This reverts commit 03a3bb7 ("hwrng: core - Freeze khwrng
thread during suspend"), ff29629 ("random: Support freezable
kthreads in add_hwgenerator_randomness()") and 59b5694 ("random:
Use wait_event_freezable() in add_hwgenerator_randomness()").

These patches introduced regressions and we need more time to
get them ready for mainline.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/char/hw_random/core.c

@@ -13,7 +13,6 @@
 #include <linux/delay.h>
 #include <linux/device.h>
 #include <linux/err.h>
-#include <linux/freezer.h>
 #include <linux/fs.h>
 #include <linux/hw_random.h>
 #include <linux/kernel.h>
@@ -422,9 +421,7 @@ static int hwrng_fillfn(void *unused)
 {
 	long rc;
 
-	set_freezable();
-
-	while (!kthread_freezable_should_stop(NULL)) {
+	while (!kthread_should_stop()) {
 		struct hwrng *rng;
 
 		rng = get_current_rng();

drivers/char/random.c

@@ -327,7 +327,6 @@
 #include <linux/percpu.h>
 #include <linux/cryptohash.h>
 #include <linux/fips.h>
-#include <linux/freezer.h>
 #include <linux/ptrace.h>
 #include <linux/workqueue.h>
 #include <linux/irq.h>
@@ -2440,8 +2439,7 @@ void add_hwgenerator_randomness(const char *buffer, size_t count,
 	 * We'll be woken up again once below random_write_wakeup_thresh,
 	 * or when the calling thread is about to terminate.
 	 */
-	wait_event_freezable(random_write_wait,
-			kthread_should_stop() ||
+	wait_event_interruptible(random_write_wait, kthread_should_stop() ||
 			ENTROPY_BITS(&input_pool) <= random_write_wakeup_bits);
 	mix_pool_bytes(poolp, buffer, count);
 	credit_entropy_bits(poolp, entropy);