From 501f77cfce8a60d583ce20a0c3f3a3eee3e5521a Mon Sep 17 00:00:00 2001 From: =?utf8?q?Uwe=20Kleine-K=C3=B6nig?= Date: Mon, 31 Jul 2023 18:54:54 +0200 Subject: [PATCH] crypto: stm32 - Properly handle pm_runtime_get failing MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit [ Upstream commit aec48805163338f8413118796c1dd035661b9140 ] If pm_runtime_get() (disguised as pm_runtime_resume_and_get()) fails, this means the clk wasn't prepared and enabled. Returning early in this case however is wrong as then the following resource frees are skipped and this is never catched up. So do all the cleanups but clk_disable_unprepare(). Also don't emit a warning, as stm32_hash_runtime_resume() already emitted one. Note that the return value of stm32_hash_remove() is mostly ignored by the device core. The only effect of returning zero instead of an error value is to suppress another warning in platform_remove(). So return 0 even if pm_runtime_resume_and_get() failed. Fixes: 8b4d566de6a5 ("crypto: stm32/hash - Add power management support") Signed-off-by: Uwe Kleine-König Signed-off-by: Herbert Xu Signed-off-by: Sasha Levin --- drivers/crypto/stm32/stm32-hash.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) diff --git a/drivers/crypto/stm32/stm32-hash.c b/drivers/crypto/stm32/stm32-hash.c index d33006d..e3f7654 100644 --- a/drivers/crypto/stm32/stm32-hash.c +++ b/drivers/crypto/stm32/stm32-hash.c @@ -1566,9 +1566,7 @@ static int stm32_hash_remove(struct platform_device *pdev) if (!hdev) return -ENODEV; - ret = pm_runtime_resume_and_get(hdev->dev); - if (ret < 0) - return ret; + ret = pm_runtime_get_sync(hdev->dev); stm32_hash_unregister_algs(hdev); @@ -1584,7 +1582,8 @@ static int stm32_hash_remove(struct platform_device *pdev) pm_runtime_disable(hdev->dev); pm_runtime_put_noidle(hdev->dev); - clk_disable_unprepare(hdev->clk); + if (ret >= 0) + clk_disable_unprepare(hdev->clk); return 0; } -- 2.7.4