crypto: pcrypt - Call crypto layer directly when padata_do_parallel() return -EBUSY

[ Upstream commit 662f2f13e66d3883b9238b0b96b17886179e60e2 ]

Since commit 8f4f68e7 ("crypto: pcrypt - Fix hungtask for
PADATA_RESET"), the pcrypt encryption and decryption operations return
-EAGAIN when the CPU goes online or offline. In alg_test(), a WARN is
generated when pcrypt_aead_decrypt() or pcrypt_aead_encrypt() returns
-EAGAIN, the unnecessary panic will occur when panic_on_warn set 1.
Fix this issue by calling crypto layer directly without parallelization
in that case.

Fixes: 8f4f68e7 ("crypto: pcrypt - Fix hungtask for PADATA_RESET")
Signed-off-by: Yi Yang <yiyang13@huawei.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Sasha Levin <sashal@kernel.org>

crypto/pcrypt.c

@@ -117,8 +117,10 @@ static int pcrypt_aead_encrypt(struct aead_request *req)
 	err = padata_do_parallel(ictx->psenc, padata, &ctx->cb_cpu);
 	if (!err)
 		return -EINPROGRESS;
-	if (err == -EBUSY)
-		return -EAGAIN;
+	if (err == -EBUSY) {
+		/* try non-parallel mode */
+		return crypto_aead_encrypt(creq);
+	}
 
 	return err;
 }
@@ -166,8 +168,10 @@ static int pcrypt_aead_decrypt(struct aead_request *req)
 	err = padata_do_parallel(ictx->psdec, padata, &ctx->cb_cpu);
 	if (!err)
 		return -EINPROGRESS;
-	if (err == -EBUSY)
-		return -EAGAIN;
+	if (err == -EBUSY) {
+		/* try non-parallel mode */
+		return crypto_aead_decrypt(creq);
+	}
 
 	return err;
 }