[PATCH v3 6/6] s390/crypto: Fix handling of EBUSY in PHMAC when req is pushed to crypto engine

[Harald Freudenberger <freude@linux.ibm.com>]

When a request is transferred to the engine via
crypto_transfer_hash_request_to_engine() there are two return codes
signaling a successful transfer: EINPROGRESS and EBUSY. However the
correct handling of EBUSY was missing and has been added as a return
code indicating a successful transfer to the crypto engine.

Fixes: cbbc675506cc ("crypto: s390 - New s390 specific protected key hash phmac")
Signed-off-by: Harald Freudenberger <freude@linux.ibm.com>
Cc: stable@vger.kernel.org # 6.17+
---
 arch/s390/crypto/phmac_s390.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/s390/crypto/phmac_s390.c b/arch/s390/crypto/phmac_s390.c
index 03ca33ffe6cc..9d77198b22ff 100644
--- a/arch/s390/crypto/phmac_s390.c
+++ b/arch/s390/crypto/phmac_s390.c
@@ -629,6 +629,8 @@ static int phmac_update(struct ahash_request *req)
 		req_ctx->async_op = OP_UPDATE;
 		atomic_inc(&tfm_ctx->via_engine_ctr);
 		rc = crypto_transfer_hash_request_to_engine(phmac_crypto_engine, req);
+		if (rc == -EBUSY)
+			rc = -EINPROGRESS;
 		if (rc != -EINPROGRESS)
 			atomic_dec(&tfm_ctx->via_engine_ctr);
 	}
@@ -667,6 +669,8 @@ static int phmac_final(struct ahash_request *req)
 		req_ctx->async_op = OP_FINAL;
 		atomic_inc(&tfm_ctx->via_engine_ctr);
 		rc = crypto_transfer_hash_request_to_engine(phmac_crypto_engine, req);
+		if (rc == -EBUSY)
+			rc = -EINPROGRESS;
 		if (rc != -EINPROGRESS)
 			atomic_dec(&tfm_ctx->via_engine_ctr);
 	}
@@ -716,6 +720,8 @@ static int phmac_finup(struct ahash_request *req)
 		/* req->async_op has been set to either OP_FINUP or OP_FINAL */
 		atomic_inc(&tfm_ctx->via_engine_ctr);
 		rc = crypto_transfer_hash_request_to_engine(phmac_crypto_engine, req);
+		if (rc == -EBUSY)
+			rc = -EINPROGRESS;
 		if (rc != -EINPROGRESS)
 			atomic_dec(&tfm_ctx->via_engine_ctr);
 	}
-- 
2.43.0