crypto: vmx - Convert to CPU feature based module autoloading

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@d-silva.org>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

2 files changed, 3 insertions, 5 deletions

diff --git a/drivers/crypto/vmx/Kconfig b/drivers/crypto/vmx/Kconfig
index 89d8208d9851..a83ead109d5f 100644
--- a/drivers/crypto/vmx/Kconfig
+++ b/drivers/crypto/vmx/Kconfig
@@ -1,7 +1,7 @@
 config CRYPTO_DEV_VMX_ENCRYPT
         tristate "Encryption acceleration support on P8 CPU"
         depends on CRYPTO_DEV_VMX
-        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 e163d5770438..5a40f2f287b1 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>
@@ -43,9 +44,6 @@ 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",
@@ -78,7 +76,7 @@ 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@br.ibm.com>");