[PATCH v2 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 | 24 ++++++++++++------------
 1 file changed, 12 insertions(+), 12 deletions(-)

diff --git a/arch/s390/crypto/paes_s390.c b/arch/s390/crypto/paes_s390.c
index 03446bfac37f..b60696c49fcc 100644
--- a/arch/s390/crypto/paes_s390.c
+++ b/arch/s390/crypto/paes_s390.c
@@ -494,15 +494,15 @@ 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 != -EINPROGRESS)
+		if (rc != -EINPROGRESS && rc != -EBUSY)
 			atomic_dec(&ctx->via_engine_ctr);
 	}
 
-	if (rc != -EINPROGRESS && walk->nbytes)
+	if (rc != -EINPROGRESS && rc != -EBUSY && walk->nbytes)
 		skcipher_walk_done(walk, rc);
 
 out:
-	if (rc != -EINPROGRESS)
+	if (rc != -EINPROGRESS && rc != -EBUSY)
 		memzero_explicit(&req_ctx->param, sizeof(req_ctx->param));
 	pr_debug("rc=%d\n", rc);
 	return rc;
@@ -763,15 +763,15 @@ 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 != -EINPROGRESS)
+		if (rc != -EINPROGRESS && rc != -EBUSY)
 			atomic_dec(&ctx->via_engine_ctr);
 	}
 
-	if (rc != -EINPROGRESS && walk->nbytes)
+	if (rc != -EINPROGRESS && rc != -EBUSY && walk->nbytes)
 		skcipher_walk_done(walk, rc);
 
 out:
-	if (rc != -EINPROGRESS)
+	if (rc != -EINPROGRESS && rc != -EBUSY)
 		memzero_explicit(&req_ctx->param, sizeof(req_ctx->param));
 	pr_debug("rc=%d\n", rc);
 	return rc;
@@ -1089,15 +1089,15 @@ 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 != -EINPROGRESS)
+		if (rc != -EINPROGRESS && rc != -EBUSY)
 			atomic_dec(&ctx->via_engine_ctr);
 	}
 
-	if (rc != -EINPROGRESS && walk->nbytes)
+	if (rc != -EINPROGRESS && rc != -EBUSY && walk->nbytes)
 		skcipher_walk_done(walk, rc);
 
 out:
-	if (rc != -EINPROGRESS)
+	if (rc != -EINPROGRESS && rc != -EBUSY)
 		memzero_explicit(&req_ctx->param, sizeof(req_ctx->param));
 	pr_debug("rc=%d\n", rc);
 	return rc;
@@ -1529,15 +1529,15 @@ 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 != -EINPROGRESS)
+		if (rc != -EINPROGRESS && rc != -EBUSY)
 			atomic_dec(&ctx->via_engine_ctr);
 	}
 
-	if (rc != -EINPROGRESS && walk->nbytes)
+	if (rc != -EINPROGRESS && rc != -EBUSY && walk->nbytes)
 		skcipher_walk_done(walk, rc);
 
 out:
-	if (rc != -EINPROGRESS)
+	if (rc != -EINPROGRESS && rc != -EBUSY)
 		memzero_explicit(&req_ctx->param, sizeof(req_ctx->param));
 	pr_debug("rc=%d\n", rc);
 	return rc;
-- 
2.43.0