[PATCH 5.15.y 6/6] crypto: omap-des - fix crypto engine cleanup

[Sasha Levin <sashal@kernel.org>]

From: Guangshuo Li <lgs201920130244@gmail.com>

[ Upstream commit 5d69ed4cd4f9c68ff9a6ebb2e8a1079223a4ec6e ]

omap_des_probe() allocates and starts a crypto engine, but the remove
path does not call the matching crypto_engine_exit(). The probe failure
path already performs this cleanup.

crypto_engine_alloc_init() creates a kthread worker for processing
requests. Without crypto_engine_exit() during driver removal, the
worker is left running after the device is removed.

Call crypto_engine_exit() after unregistering the algorithms and before
tearing down the remaining request handling resources. This stops the
engine and destroys its worker.

This issue was found by manual code inspection.

Fixes: f1b77aaca85a ("crypto: omap-des - Integrate with the crypto engine framework")
Cc: stable@vger.kernel.org
Signed-off-by: Guangshuo Li <lgs201920130244@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/crypto/omap-des.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/crypto/omap-des.c b/drivers/crypto/omap-des.c
index 84e3e69a406fd..ad09560c9f4f4 100644
--- a/drivers/crypto/omap-des.c
+++ b/drivers/crypto/omap-des.c
@@ -1098,6 +1098,8 @@ static int omap_des_remove(struct platform_device *pdev)
 			crypto_engine_unregister_skcipher(
 					&dd->pdata->algs_info[i].algs_list[j]);
 
+	crypto_engine_exit(dd->engine);
+
 	cancel_work_sync(&dd->done_task);
 	omap_des_dma_cleanup(dd);
 	pm_runtime_disable(dd->dev);
-- 
2.53.0