crypto: inside-secure - Fix unused variable warning when CONFIG_PCI=n

This patch fixes an unused variable warning from the compiler when the
driver is being compiled without PCI support in the kernel.

Fixes: 625f269a ("crypto: inside-secure - add support for...")
Signed-off-by: Pascal van Leeuwen <pvanleeuwen@verimatrix.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/inside-secure/safexcel.c

@@ -1789,32 +1789,50 @@ static struct pci_driver safexcel_pci_driver = {
 };
 #endif
 
-static int __init safexcel_init(void)
-{
-	int rc;
-
+/* Unfortunately, we have to resort to global variables here */
+#if IS_ENABLED(CONFIG_PCI)
+int pcireg_rc = -EINVAL; /* Default safe value */
+#endif
 #if IS_ENABLED(CONFIG_OF)
-		/* Register platform driver */
-		platform_driver_register(&crypto_safexcel);
+int ofreg_rc = -EINVAL; /* Default safe value */
 #endif
 
+static int __init safexcel_init(void)
+{
 #if IS_ENABLED(CONFIG_PCI)
-		/* Register PCI driver */
-		rc = pci_register_driver(&safexcel_pci_driver);
+	/* Register PCI driver */
+	pcireg_rc = pci_register_driver(&safexcel_pci_driver);
 #endif
 
-	return 0;
+#if IS_ENABLED(CONFIG_OF)
+	/* Register platform driver */
+	ofreg_rc = platform_driver_register(&crypto_safexcel);
+ #if IS_ENABLED(CONFIG_PCI)
+	/* Return success if either PCI or OF registered OK */
+	return pcireg_rc ? ofreg_rc : 0;
+ #else
+	return ofreg_rc;
+ #endif
+#else
+ #if IS_ENABLED(CONFIG_PCI)
+	return pcireg_rc;
+ #else
+	return -EINVAL;
+ #endif
+#endif
 }
 
 static void __exit safexcel_exit(void)
 {
 #if IS_ENABLED(CONFIG_OF)
-		/* Unregister platform driver */
+	/* Unregister platform driver */
+	if (!ofreg_rc)
 		platform_driver_unregister(&crypto_safexcel);
 #endif
 
 #if IS_ENABLED(CONFIG_PCI)
-		/* Unregister PCI driver if successfully registered before */
+	/* Unregister PCI driver if successfully registered before */
+	if (!pcireg_rc)
 		pci_unregister_driver(&safexcel_pci_driver);
 #endif
 }