Commit c9f21cb6 authored by Tom Lendacky's avatar Tom Lendacky Committed by Herbert Xu
Browse files

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: default avatarScot Doyle <lkml14@scotdoyle.com>
Signed-off-by: default avatarTom Lendacky <thomas.lendacky@amd.com>
Tested-by: default avatarScot Doyle <lkml14@scotdoyle.com>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent 413e5574

drivers/crypto/ccp/ccp-crypto-main.c

+4 −0
Original line number Diff line number Diff line
@@ -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;

drivers/crypto/ccp/ccp-dev.c

+14 −0
Original line number Diff line number Diff line
@@ -54,6 +54,20 @@ static inline void ccp_del_device(struct ccp_device *ccp) 
	ccp_dev = NULL;

}



/**

 * 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

 *

include/linux/ccp.h

+12 −0
Original line number Diff line number Diff line
@@ -26,6 +26,13 @@ struct ccp_cmd; 
#if defined(CONFIG_CRYPTO_DEV_CCP_DD) || \

	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

 *
@@ -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;

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