linux-kernel - [PATCH v2 1/3] arm64: crypto/aes-ce-ccm: Cleanup hwcap check

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Date:   Mon, 31 Oct 2016 16:03:43 +0000
From:   Suzuki K Poulose <suzuki.poulose@....com>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org, kvmarm@...ts.cs.columbia.edu,
        christoffer.dall@...aro.org, catalin.marinas@....com,
        will.deacon@....com, mark.rutland@....com, marc.zyngier@....com,
        ard.biesheuvel@...aro.org,
        Suzuki K Poulose <suzuki.poulose@....com>
Subject: [PATCH v2 1/3] arm64: crypto/aes-ce-ccm: Cleanup hwcap check

Use the module_cpu_feature_match to make sure the system has
HWCAP_AES to use the module.

Cc: Ard Biesheuvel <ard.biesheuvel@...aro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
---
 arch/arm64/crypto/aes-ce-ccm-glue.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/arch/arm64/crypto/aes-ce-ccm-glue.c b/arch/arm64/crypto/aes-ce-ccm-glue.c
index f4bf2f2..fa82eaa 100644
--- a/arch/arm64/crypto/aes-ce-ccm-glue.c
+++ b/arch/arm64/crypto/aes-ce-ccm-glue.c
@@ -14,6 +14,7 @@
 #include <crypto/algapi.h>
 #include <crypto/scatterwalk.h>
 #include <crypto/internal/aead.h>
+#include <linux/cpufeature.h>
 #include <linux/module.h>
 
 #include "aes-ce-setkey.h"
@@ -296,8 +297,6 @@ static struct aead_alg ccm_aes_alg = {
 
 static int __init aes_mod_init(void)
 {
-	if (!(elf_hwcap & HWCAP_AES))
-		return -ENODEV;
 	return crypto_register_aead(&ccm_aes_alg);
 }
 
@@ -306,7 +305,7 @@ static void __exit aes_mod_exit(void)
 	crypto_unregister_aead(&ccm_aes_alg);
 }
 
-module_init(aes_mod_init);
+module_cpu_feature_match(AES, aes_mod_init);
 module_exit(aes_mod_exit);
 
 MODULE_DESCRIPTION("Synchronous AES in CCM mode using ARMv8 Crypto Extensions");
-- 
2.7.4