ath9k: fix rng high cpu load (a2cb3d5f) · Commits · 戴 / test

drivers/net/wireless/ath/ath9k/rng.c

+19 −1

Original line number	Diff line number	Diff line
		@@ -55,11 +55,26 @@ static int ath9k_rng_data_read(struct ath_softc sc, u32 buf, u32 buf_size)
		return j << 2;
		}

		static u32 ath9k_rng_delay_get(u32 fail_stats)
		{
		u32 delay;

		if (fail_stats < 100)
		delay = 10;
		else if (fail_stats < 105)
		delay = 1000;
		else
		delay = 10000;

		return delay;
		}

		static int ath9k_rng_kthread(void *data)
		{
		int bytes_read;
		struct ath_softc *sc = data;
		u32 *rng_buf;
		u32 delay, fail_stats = 0;

		rng_buf = kmalloc_array(ATH9K_RNG_BUF_SIZE, sizeof(u32), GFP_KERNEL);
		if (!rng_buf)
		@@ -69,10 +84,13 @@ static int ath9k_rng_kthread(void *data)
		bytes_read = ath9k_rng_data_read(sc, rng_buf,
		ATH9K_RNG_BUF_SIZE);
		if (unlikely(!bytes_read)) {
		msleep_interruptible(10);
		delay = ath9k_rng_delay_get(++fail_stats);
		msleep_interruptible(delay);
		continue;
		}

		fail_stats = 0;

		/* sleep until entropy bits under write_wakeup_threshold */
		add_hwgenerator_randomness((void *)rng_buf, bytes_read,
		ATH9K_RNG_ENTROPY(bytes_read));