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authorTom Lendacky <thomas.lendacky@amd.com>2014-09-05 10:31:09 -0500
committerHerbert Xu <herbert@gondor.apana.org.au>2014-09-24 14:23:34 +0800
commitc9f21cb6388898bfe69886d001316dae7ecc9a4b (patch)
tree6ebee443acb2d588656f3a36c935ff383f8a5608 /include
parent413e55742a4f18da6173271ca66748e690997f30 (diff)
downloadlinux-linaro-stable-c9f21cb6388898bfe69886d001316dae7ecc9a4b.tar.gz
crypto: ccp - Check for CCP before registering crypto algs
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. Cc: stable@vger.kernel.org Reported-by: Scot Doyle <lkml14@scotdoyle.com> Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com> Tested-by: Scot Doyle <lkml14@scotdoyle.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'include')
-rw-r--r--include/linux/ccp.h12
1 files changed, 12 insertions, 0 deletions
diff --git a/include/linux/ccp.h b/include/linux/ccp.h
index ebcc9d146219..7f437036baa4 100644
--- 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;