From: Jorge Ramirez-Ortiz <jorge@foundries.io>
Date: Thu, 6 Aug 2020 10:00:09 +0000 (+0200)
Subject: hwrng: optee - handle unlimited data rates
X-Git-Tag: Ubuntu-5.10.0-12.13~1740^2~187
X-Git-Url: https://git.proxmox.com/?a=commitdiff_plain;h=340939933e841bca50324d324e6a7ccf9b42999f;p=mirror_ubuntu-hirsute-kernel.git

hwrng: optee - handle unlimited data rates

Data rates of MAX_UINT32 will schedule an unnecessary one jiffy
timeout on the call to msleep. Avoid this scenario by using 0 as the
unlimited data rate.

Signed-off-by: Jorge Ramirez-Ortiz <jorge@foundries.io>
Reviewed-by: Sumit Garg <sumit.garg@linaro.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
---

diff --git a/drivers/char/hw_random/optee-rng.c b/drivers/char/hw_random/optee-rng.c
index 49b2e02537dd..5bc4700c4dae 100644
--- a/drivers/char/hw_random/optee-rng.c
+++ b/drivers/char/hw_random/optee-rng.c
@@ -128,7 +128,7 @@ static int optee_rng_read(struct hwrng *rng, void *buf, size_t max, bool wait)
 		data += rng_size;
 		read += rng_size;
 
-		if (wait) {
+		if (wait && pvt_data->data_rate) {
 			if (timeout-- == 0)
 				return read;
 			msleep((1000 * (max - read)) / pvt_data->data_rate);