crypto-make-core-static-and-init-scru-early.patch

Subject: crypto: Make core builtin and init srcu early
From: Thomas Gleixner <tglx@linutronix.de>
Date: Fri, 12 Oct 2012 11:09:19 +0100

When the scru notifier is not initialized before the first user we
crash.

[    0.281119] BUG: unable to handle kernel NULL pointer dereference at           (null)
[    0.281124] IP: [<ffffffff8108ee6d>] __srcu_read_lock+0x2f/0x79

Make the core code built-in for now and enfore early init.

FIXME: Create a static initializer for this.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
 crypto/Kconfig |    2 +-
 crypto/api.c   |    7 +++++++
 2 files changed, 8 insertions(+), 1 deletion(-)

Index: linux-stable/crypto/Kconfig
===================================================================
--- linux-stable.orig/crypto/Kconfig
+++ linux-stable/crypto/Kconfig
@@ -13,7 +13,7 @@ source "crypto/async_tx/Kconfig"
 # Cryptographic API Configuration
 #
 menuconfig CRYPTO
-	tristate "Cryptographic API"
+	bool "Cryptographic API"
 	help
 	  This option provides the core Cryptographic API.
 
Index: linux-stable/crypto/api.c
===================================================================
--- linux-stable.orig/crypto/api.c
+++ linux-stable/crypto/api.c
@@ -34,6 +34,13 @@ EXPORT_SYMBOL_GPL(crypto_alg_sem);
 struct srcu_notifier_head crypto_chain;
 EXPORT_SYMBOL_GPL(crypto_chain);
 
+static int __init crypto_api_init(void)
+{
+	srcu_init_notifier_head(&crypto_chain);
+	return 0;
+}
+core_initcall(crypto_api_init);
+
 static inline struct crypto_alg *crypto_alg_get(struct crypto_alg *alg)
 {
 	atomic_inc(&alg->cra_refcnt);