[PATCH v3 5/6] s390/crypto: Fix handling of EBUSY in PAES when req is pushed to crypto engine

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

When a request is transferred to the engine via
crypto_transfer_skcipher_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: 6cd87cb5ef6c ("s390/crypto: Rework protected key AES for true asynch support")
Signed-off-by: Harald Freudenberger <freude@linux.ibm.com>
Cc: stable@vger.kernel.org # 6.16+
---
 arch/s390/crypto/paes_s390.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/arch/s390/crypto/paes_s390.c b/arch/s390/crypto/paes_s390.c
index 03446bfac37f..1dd48f7a1bdf 100644
--- a/arch/s390/crypto/paes_s390.c
+++ b/arch/s390/crypto/paes_s390.c
@@ -494,6 +494,8 @@ static int ecb_paes_crypt(struct skcipher_request *req, unsigned long modifier)
 	if (rc == 0 || rc == -EKEYEXPIRED) {
 		atomic_inc(&ctx->via_engine_ctr);
 		rc = crypto_transfer_skcipher_request_to_engine(paes_crypto_engine, req);
+		if (rc == -EBUSY)
+			rc = -EINPROGRESS;
 		if (rc != -EINPROGRESS)
 			atomic_dec(&ctx->via_engine_ctr);
 	}
@@ -763,6 +765,8 @@ static int cbc_paes_crypt(struct skcipher_request *req, unsigned long modifier)
 	if (rc == 0 || rc == -EKEYEXPIRED) {
 		atomic_inc(&ctx->via_engine_ctr);
 		rc = crypto_transfer_skcipher_request_to_engine(paes_crypto_engine, req);
+		if (rc == -EBUSY)
+			rc = -EINPROGRESS;
 		if (rc != -EINPROGRESS)
 			atomic_dec(&ctx->via_engine_ctr);
 	}
@@ -1089,6 +1093,8 @@ static int ctr_paes_crypt(struct skcipher_request *req)
 	if (rc == 0 || rc == -EKEYEXPIRED) {
 		atomic_inc(&ctx->via_engine_ctr);
 		rc = crypto_transfer_skcipher_request_to_engine(paes_crypto_engine, req);
+		if (rc == -EBUSY)
+			rc = -EINPROGRESS;
 		if (rc != -EINPROGRESS)
 			atomic_dec(&ctx->via_engine_ctr);
 	}
@@ -1529,6 +1535,8 @@ static inline int xts_paes_crypt(struct skcipher_request *req, unsigned long mod
 	if (rc == 0 || rc == -EKEYEXPIRED) {
 		atomic_inc(&ctx->via_engine_ctr);
 		rc = crypto_transfer_skcipher_request_to_engine(paes_crypto_engine, req);
+		if (rc == -EBUSY)
+			rc = -EINPROGRESS;
 		if (rc != -EINPROGRESS)
 			atomic_dec(&ctx->via_engine_ctr);
 	}
-- 
2.43.0