Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit d7fd6075 authored by Krzysztof Kozlowski's avatar Krzysztof Kozlowski Committed by Herbert Xu
Browse files

hwrng: exynos - Add timeout for waiting on init done 



Driver may hang waiting indefinitely for PRNG to finish its
initialization stage. Instead of stalling return -ETIMEDOUT error.

Signed-off-by: default avatarKrzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent 2b748a2f

drivers/char/hw_random/exynos-rng.c

+4 −1
Original line number Diff line number Diff line
@@ -81,14 +81,17 @@ static int exynos_read(struct hwrng *rng, void *buf, 
	struct exynos_rng *exynos_rng = container_of(rng,

						struct exynos_rng, rng);

	u32 *data = buf;

	int retry = 100;



	pm_runtime_get_sync(exynos_rng->dev);



	exynos_rng_writel(exynos_rng, PRNG_START, 0);



	while (!(exynos_rng_readl(exynos_rng,

			EXYNOS_PRNG_STATUS_OFFSET) & PRNG_DONE))

			EXYNOS_PRNG_STATUS_OFFSET) & PRNG_DONE) && --retry)

		cpu_relax();

	if (!retry)

		return -ETIMEDOUT;



	exynos_rng_writel(exynos_rng, PRNG_DONE, EXYNOS_PRNG_STATUS_OFFSET);