This is a note to let you know that I've just added the patch titled
crypto: ccp - Check for CCP before registering crypto algs
to the 3.16-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
crypto-ccp-check-for-ccp-before-registering-crypto-algs.patch
and it can be found in the queue-3.16 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From c9f21cb6388898bfe69886d001316dae7ecc9a4b Mon Sep 17 00:00:00 2001
From: Tom Lendacky <[email protected]>
Date: Fri, 5 Sep 2014 10:31:09 -0500
Subject: crypto: ccp - Check for CCP before registering crypto algs
From: Tom Lendacky <[email protected]>
commit c9f21cb6388898bfe69886d001316dae7ecc9a4b upstream.
If the ccp is built as a built-in module, then ccp-crypto (whether
built as a module or a built-in module) will be able to load and
it will register its crypto algorithms. If the system does not have
a CCP this will result in -ENODEV being returned whenever a command
is attempted to be queued by the registered crypto algorithms.
Add an API, ccp_present(), that checks for the presence of a CCP
on the system. The ccp-crypto module can use this to determine if it
should register it's crypto alogorithms.
Reported-by: Scot Doyle <[email protected]>
Signed-off-by: Tom Lendacky <[email protected]>
Tested-by: Scot Doyle <[email protected]>
Signed-off-by: Herbert Xu <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/crypto/ccp/ccp-crypto-main.c | 4 ++++
drivers/crypto/ccp/ccp-dev.c | 14 ++++++++++++++
include/linux/ccp.h | 12 ++++++++++++
3 files changed, 30 insertions(+)
--- a/drivers/crypto/ccp/ccp-crypto-main.c
+++ b/drivers/crypto/ccp/ccp-crypto-main.c
@@ -367,6 +367,10 @@ static int ccp_crypto_init(void)
{
int ret;
+ ret = ccp_present();
+ if (ret)
+ return ret;
+
spin_lock_init(&req_queue_lock);
INIT_LIST_HEAD(&req_queue.cmds);
req_queue.backlog = &req_queue.cmds;
--- a/drivers/crypto/ccp/ccp-dev.c
+++ b/drivers/crypto/ccp/ccp-dev.c
@@ -53,6 +53,20 @@ static inline void ccp_del_device(struct
}
/**
+ * ccp_present - check if a CCP device is present
+ *
+ * Returns zero if a CCP device is present, -ENODEV otherwise.
+ */
+int ccp_present(void)
+{
+ if (ccp_get_device())
+ return 0;
+
+ return -ENODEV;
+}
+EXPORT_SYMBOL_GPL(ccp_present);
+
+/**
* ccp_enqueue_cmd - queue an operation for processing by the CCP
*
* @cmd: ccp_cmd struct to be processed
--- a/include/linux/ccp.h
+++ b/include/linux/ccp.h
@@ -27,6 +27,13 @@ struct ccp_cmd;
defined(CONFIG_CRYPTO_DEV_CCP_DD_MODULE)
/**
+ * ccp_present - check if a CCP device is present
+ *
+ * Returns zero if a CCP device is present, -ENODEV otherwise.
+ */
+int ccp_present(void);
+
+/**
* ccp_enqueue_cmd - queue an operation for processing by the CCP
*
* @cmd: ccp_cmd struct to be processed
@@ -53,6 +60,11 @@ int ccp_enqueue_cmd(struct ccp_cmd *cmd)
#else /* CONFIG_CRYPTO_DEV_CCP_DD is not enabled */
+static inline int ccp_present(void)
+{
+ return -ENODEV;
+}
+
static inline int ccp_enqueue_cmd(struct ccp_cmd *cmd)
{
return -ENODEV;
Patches currently in stable-queue which might be from [email protected]
are
queue-3.16/crypto-ccp-check-for-ccp-before-registering-crypto-algs.patch
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