Revert "test_firmware: Test platform fw loading on non-EFI systems"

This reverts commit 2d38dbf as it broke
the build in linux-next

Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Fixes: 2d38dbf ("test_firmware: Test platform fw loading on non-EFI systems")
Cc: stable@vger.kernel.org
Cc: Scott Branden <scott.branden@broadcom.com>
Cc: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20200727165539.0e8797ab@canb.auug.org.au
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/firmware/efi/embedded-firmware.c

@@ -14,22 +14,11 @@
 #include <linux/vmalloc.h>
 #include <crypto/sha.h>
 
-#include "embedded-firmware.h"
-
-#ifdef CONFIG_TEST_FIRMWARE
-# define EFI_EMBEDDED_FW_VISIBILITY
-#else
-# define EFI_EMBEDDED_FW_VISIBILITY static
-#endif
-
-EFI_EMBEDDED_FW_VISIBILITY LIST_HEAD(efi_embedded_fw_list);
-EFI_EMBEDDED_FW_VISIBILITY bool efi_embedded_fw_checked;
-
 /* Exported for use by lib/test_firmware.c only */
-#ifdef CONFIG_TEST_FIRMWARE
+LIST_HEAD(efi_embedded_fw_list);
 EXPORT_SYMBOL_GPL(efi_embedded_fw_list);
-EXPORT_SYMBOL_GPL(efi_embedded_fw_checked);
-#endif
+
+static bool checked_for_fw;
 
 static const struct dmi_system_id * const embedded_fw_table[] = {
 #ifdef CONFIG_TOUCHSCREEN_DMI
@@ -130,14 +119,14 @@ void __init efi_check_for_embedded_firmwares(void)
 		}
 	}
 
-	efi_embedded_fw_checked = true;
+	checked_for_fw = true;
 }
 
 int efi_get_embedded_fw(const char *name, const u8 **data, size_t *size)
 {
 	struct efi_embedded_fw *iter, *fw = NULL;
 
-	if (!efi_embedded_fw_checked) {
+	if (!checked_for_fw) {
 		pr_warn("Warning %s called while we did not check for embedded fw\n",
 			__func__);
 		return -ENOENT;

include/linux/efi_embedded_fw.h

@@ -7,6 +7,19 @@
 
 #define EFI_EMBEDDED_FW_PREFIX_LEN		8
 
+/*
+ * This struct and efi_embedded_fw_list are private to the efi-embedded fw
+ * implementation they are in this header for use by lib/test_firmware.c only!
+ */
+struct efi_embedded_fw {
+	struct list_head list;
+	const char *name;
+	const u8 *data;
+	size_t length;
+};
+
+extern struct list_head efi_embedded_fw_list;
+
 /**
  * struct efi_embedded_fw_desc - This struct is used by the EFI embedded-fw
  *                               code to search for embedded firmwares.

lib/test_firmware.c

@@ -489,7 +489,6 @@ static ssize_t trigger_request_store(struct device *dev,
 static DEVICE_ATTR_WO(trigger_request);
 
 #ifdef CONFIG_EFI_EMBEDDED_FIRMWARE
-#include "../drivers/firmware/efi/embedded-firmware.h"
 static ssize_t trigger_request_platform_store(struct device *dev,
 					      struct device_attribute *attr,
 					      const char *buf, size_t count)
@@ -502,7 +501,6 @@ static ssize_t trigger_request_platform_store(struct device *dev,
 	};
 	struct efi_embedded_fw efi_embedded_fw;
 	const struct firmware *firmware = NULL;
-	bool saved_efi_embedded_fw_checked;
 	char *name;
 	int rc;
 
@@ -515,8 +513,6 @@ static ssize_t trigger_request_platform_store(struct device *dev,
 	efi_embedded_fw.data = (void *)test_data;
 	efi_embedded_fw.length = sizeof(test_data);
 	list_add(&efi_embedded_fw.list, &efi_embedded_fw_list);
-	saved_efi_embedded_fw_checked = efi_embedded_fw_checked;
-	efi_embedded_fw_checked = true;
 
 	pr_info("loading '%s'\n", name);
 	rc = firmware_request_platform(&firmware, name, dev);
@@ -534,7 +530,6 @@ static ssize_t trigger_request_platform_store(struct device *dev,
 	rc = count;
 
 out:
-	efi_embedded_fw_checked = saved_efi_embedded_fw_checked;
 	release_firmware(firmware);
 	list_del(&efi_embedded_fw.list);
 	kfree(name);