crypto: ccp - CCP device enabled/disabled changes

The CCP cannot be hot-plugged so it will either be there
or it won't.  Do not allow the driver to stay loaded if the
CCP does not successfully initialize.

Provide stub routines in the ccp.h file that return -ENODEV
if the CCP has not been configured in the build.

Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/ccp/ccp-dev.c

@@ -552,6 +552,7 @@ static const struct x86_cpu_id ccp_support[] = {
 static int __init ccp_mod_init(void)
 {
 	struct cpuinfo_x86 *cpuinfo = &boot_cpu_data;
+	int ret;
 
 	if (!x86_match_cpu(ccp_support))
 		return -ENODEV;
@@ -560,7 +561,19 @@ static int __init ccp_mod_init(void)
 	case 22:
 		if ((cpuinfo->x86_model < 48) || (cpuinfo->x86_model > 63))
 			return -ENODEV;
-		return ccp_pci_init();
+
+		ret = ccp_pci_init();
+		if (ret)
+			return ret;
+
+		/* Don't leave the driver loaded if init failed */
+		if (!ccp_get_device()) {
+			ccp_pci_exit();
+			return -ENODEV;
+		}
+
+		return 0;
+
 		break;
 	}
 

drivers/crypto/ccp/ccp-pci.c

@@ -267,6 +267,9 @@ static void ccp_pci_remove(struct pci_dev *pdev)
 	struct device *dev = &pdev->dev;
 	struct ccp_device *ccp = dev_get_drvdata(dev);
 
+	if (!ccp)
+		return;
+
 	ccp_destroy(ccp);
 
 	pci_iounmap(pdev, ccp->io_map);

include/linux/ccp.h

@@ -23,6 +23,9 @@
 struct ccp_device;
 struct ccp_cmd;
 
+#if defined(CONFIG_CRYPTO_DEV_CCP_DD) || \
+	defined(CONFIG_CRYPTO_DEV_CCP_DD_MODULE)
+
 /**
  * ccp_enqueue_cmd - queue an operation for processing by the CCP
  *
@@ -48,6 +51,15 @@ struct ccp_cmd;
  */
 int ccp_enqueue_cmd(struct ccp_cmd *cmd);
 
+#else /* CONFIG_CRYPTO_DEV_CCP_DD is not enabled */
+
+static inline int ccp_enqueue_cmd(struct ccp_cmd *cmd)
+{
+	return -ENODEV;
+}
+
+#endif /* CONFIG_CRYPTO_DEV_CCP_DD */
+
 
 /***** AES engine *****/
 /**