[PATCH 2/2] crypto: vmx - Convert to CPU feature based module autoloading

[Tim Gardner]

From: Alastair D'Silva <alastair at d-silva.org>

BugLink: http://bugs.launchpad.net/bugs/1651322

This patch utilises the GENERIC_CPU_AUTOPROBE infrastructure
to automatically load the vmx_crypto module if the CPU supports
it.

Signed-off-by: Alastair D'Silva <alastair at d-silva.org>
Acked-by: Herbert Xu <herbert at gondor.apana.org.au>
Signed-off-by: Michael Ellerman <mpe at ellerman.id.au>
(back ported from commit ccf5c442a1b82bf74105d72416e069607353cb82)
Signed-off-by: Tim Gardner <tim.gardner at canonical.com>

Conflicts:
	drivers/crypto/vmx/Kconfig
---
 drivers/crypto/vmx/Kconfig | 2 +-
 drivers/crypto/vmx/vmx.c   | 6 ++----
 2 files changed, 3 insertions(+), 5 deletions(-)

diff --git a/drivers/crypto/vmx/Kconfig b/drivers/crypto/vmx/Kconfig
index b225742..c3d524e 100644
--- a/drivers/crypto/vmx/Kconfig
+++ b/drivers/crypto/vmx/Kconfig
@@ -2,7 +2,7 @@ config CRYPTO_DEV_VMX_ENCRYPT
 	tristate "Encryption acceleration support on P8 CPU"
 	depends on CRYPTO_DEV_VMX
 	select CRYPTO_GHASH
-	default y
+	default m
 	help
 	  Support for VMX cryptographic acceleration instructions on Power8 CPU.
 	  This module supports acceleration for AES and GHASH in hardware. If you
diff --git a/drivers/crypto/vmx/vmx.c b/drivers/crypto/vmx/vmx.c
index f688c32..31a98dc 100644
--- a/drivers/crypto/vmx/vmx.c
+++ b/drivers/crypto/vmx/vmx.c
@@ -23,6 +23,7 @@
 #include <linux/moduleparam.h>
 #include <linux/types.h>
 #include <linux/err.h>
+#include <linux/cpufeature.h>
 #include <linux/crypto.h>
 #include <asm/cputable.h>
 #include <crypto/internal/hash.h>
@@ -45,9 +46,6 @@ int __init p8_init(void)
 	int ret = 0;
 	struct crypto_alg **alg_it;
 
-	if (!(cur_cpu_spec->cpu_user_features2 & PPC_FEATURE2_VEC_CRYPTO))
-		return -ENODEV;
-
 	for (alg_it = algs; *alg_it; alg_it++) {
 		ret = crypto_register_alg(*alg_it);
 		printk(KERN_INFO "crypto_register_alg '%s' = %d\n",
@@ -80,7 +78,7 @@ void __exit p8_exit(void)
 	crypto_unregister_shash(&p8_ghash_alg);
 }
 
-module_init(p8_init);
+module_cpu_feature_match(PPC_MODULE_FEATURE_VEC_CRYPTO, p8_init);
 module_exit(p8_exit);
 
 MODULE_AUTHOR("Marcelo Cerri<mhcerri at br.ibm.com>");
-- 
2.7.4