[PATCH 5.8 108/633] crypto: ccree - fix runtime PM imbalance on error

Greg Kroah-Hartman
2020-10-27T17:23:57Z

From: dinghao.liu@zju.edu.cn <dinghao.liu@zju.edu.cn>

[ Upstream commit b7b57a5643c2ae45afe6aa5e73363b553cacd14b ]

pm_runtime_get_sync() increments the runtime PM usage counter
even when it returns an error code. However, users of cc_pm_get(),
a direct wrapper of pm_runtime_get_sync(), assume that PM usage
counter will not change on error. Thus a pairing decrement is needed
on the error handling path to keep the counter balanced.

Fixes: 8c7849a30255c ("crypto: ccree - simplify Runtime PM handling")
Signed-off-by: Dinghao Liu <dinghao.liu@zju.edu.cn>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/crypto/ccree/cc_pm.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/crypto/ccree/cc_pm.c b/drivers/crypto/ccree/cc_pm.c
index d39e1664fc7ed..3c65bf070c908 100644
--- a/drivers/crypto/ccree/cc_pm.c
+++ b/drivers/crypto/ccree/cc_pm.c
@@ -65,8 +65,12 @@ const struct dev_pm_ops ccree_pm = {
int cc_pm_get(struct device *dev)
{
int rc = pm_runtime_get_sync(dev);
+ if (rc < 0) {
+ pm_runtime_put_noidle(dev);
+ return rc;
+ }

- return (rc == 1 ? 0 : rc);
+ return 0;
}

void cc_pm_put_suspend(struct device *dev)
--
2.25.1