[PATCH 5.17 482/772] hwrng: cn10k - Make check_rng_health() return an error code

Greg Kroah-Hartman
2022-06-07T21:21:34Z

From: Vladis Dronov <vdronov@redhat.com>

[ Upstream commit 32547a6aedda132907fcd15cdc8271429609f216 ]

Currently check_rng_health() returns zero unconditionally.
Make it to output an error code and return it.

Fixes: 38e9791a0209 ("hwrng: cn10k - Add random number generator support")
Signed-off-by: Vladis Dronov <vdronov@redhat.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/char/hw_random/cn10k-rng.c | 15 +++++++--------
1 file changed, 7 insertions(+), 8 deletions(-)

diff --git a/drivers/char/hw_random/cn10k-rng.c b/drivers/char/hw_random/cn10k-rng.c
index dd226630b67d..a01e9307737c 100644
--- a/drivers/char/hw_random/cn10k-rng.c
+++ b/drivers/char/hw_random/cn10k-rng.c
@@ -31,26 +31,23 @@ struct cn10k_rng {

#define PLAT_OCTEONTX_RESET_RNG_EBG_HEALTH_STATE 0xc2000b0f

-static int reset_rng_health_state(struct cn10k_rng *rng)
+static unsigned long reset_rng_health_state(struct cn10k_rng *rng)
{
struct arm_smccc_res res;

/* Send SMC service call to reset EBG health state */
arm_smccc_smc(PLAT_OCTEONTX_RESET_RNG_EBG_HEALTH_STATE, 0, 0, 0, 0, 0, 0, 0, &res);
- if (res.a0 != 0UL)
- return -EIO;
-
- return 0;
+ return res.a0;
}

static int check_rng_health(struct cn10k_rng *rng)
{
u64 status;
- int err;
+ unsigned long err;

/* Skip checking health */
if (!rng->reg_base)
- return 0;
+ return -ENODEV;

status = readq(rng->reg_base + RNM_PF_EBG_HEALTH);
if (status & BIT_ULL(20)) {
@@ -58,7 +55,9 @@ static int check_rng_health(struct cn10k_rng *rng)
if (err) {
dev_err(&rng->pdev->dev, "HWRNG: Health test failed (status=%llx)\n",
status);
- dev_err(&rng->pdev->dev, "HWRNG: error during reset\n");
+ dev_err(&rng->pdev->dev, "HWRNG: error during reset (error=%lx)\n",
+ err);
+ return -EIO;
}
}
return 0;
--
2.35.1