2021-04-08 07:20:13

by Shixin Liu

[permalink] [raw]
Subject: [PATCH -next 4/7] crypto: stm32/hash - Fix PM reference leak on stm32-hash.c

pm_runtime_get_sync will increment pm usage counter even it failed.
Forgetting to putting operation will result in reference leak here.
Fix it by replacing it with pm_runtime_resume_and_get to keep usage
counter balanced.

Signed-off-by: Shixin Liu <[email protected]>
---
drivers/crypto/stm32/stm32-hash.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/crypto/stm32/stm32-hash.c b/drivers/crypto/stm32/stm32-hash.c
index 7ac0573ef663..389de9e3302d 100644
--- a/drivers/crypto/stm32/stm32-hash.c
+++ b/drivers/crypto/stm32/stm32-hash.c
@@ -813,7 +813,7 @@ static void stm32_hash_finish_req(struct ahash_request *req, int err)
static int stm32_hash_hw_init(struct stm32_hash_dev *hdev,
struct stm32_hash_request_ctx *rctx)
{
- pm_runtime_get_sync(hdev->dev);
+ pm_runtime_resume_and_get(hdev->dev);

if (!(HASH_FLAGS_INIT & hdev->flags)) {
stm32_hash_write(hdev, HASH_CR, HASH_CR_INIT);
@@ -962,7 +962,7 @@ static int stm32_hash_export(struct ahash_request *req, void *out)
u32 *preg;
unsigned int i;

- pm_runtime_get_sync(hdev->dev);
+ pm_runtime_resume_and_get(hdev->dev);

while ((stm32_hash_read(hdev, HASH_SR) & HASH_SR_BUSY))
cpu_relax();
@@ -1000,7 +1000,7 @@ static int stm32_hash_import(struct ahash_request *req, const void *in)

preg = rctx->hw_context;

- pm_runtime_get_sync(hdev->dev);
+ pm_runtime_resume_and_get(hdev->dev);

stm32_hash_write(hdev, HASH_IMR, *preg++);
stm32_hash_write(hdev, HASH_STR, *preg++);
@@ -1566,7 +1566,7 @@ static int stm32_hash_remove(struct platform_device *pdev)
if (!hdev)
return -ENODEV;

- ret = pm_runtime_get_sync(hdev->dev);
+ ret = pm_runtime_resume_and_get(hdev->dev);
if (ret < 0)
return ret;

--
2.25.1