57 lines
1.6 KiB
Diff
57 lines
1.6 KiB
Diff
From: Ben Hutchings <ben@decadent.org.uk>
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Subject: x86/efi: Autoload efivars
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Date: Mon, 18 Mar 2013 22:59:14 +0000
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Bug-Debian: http://bugs.debian.org/703363
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efivars is generally useful to have on EFI systems, and in some cases
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it may be impossible to load it after a kernel upgrade in order to
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complete a boot loader update. At the same time we don't want to
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waste memory on non-EFI systems by making it built-in.
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Instead, give it a module alias as if it's a platform driver, and
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register a corresponding platform device whenever EFI runtime services
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are available. This should trigger udev to load it.
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---
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--- a/arch/x86/platform/efi/efi.c
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+++ b/arch/x86/platform/efi/efi.c
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@@ -38,6 +38,7 @@
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#include <linux/io.h>
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#include <linux/reboot.h>
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#include <linux/bcd.h>
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+#include <linux/platform_device.h>
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#include <asm/setup.h>
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#include <asm/efi.h>
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@@ -612,6 +613,20 @@ void __init efi_init(void)
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#endif
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}
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+#ifdef CONFIG_EFI_VARS_MODULE
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+static int __init efi_load_efivars(void)
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+{
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+ struct platform_device *pdev;
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+
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+ if (!efi_enabled(EFI_RUNTIME_SERVICES))
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+ return 0;
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+
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+ pdev = platform_device_register_simple("efivars", 0, NULL, 0);
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+ return IS_ERR(pdev) ? PTR_ERR(pdev) : 0;
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+}
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+device_initcall(efi_load_efivars);
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+#endif
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+
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void __init efi_set_executable(efi_memory_desc_t *md, bool executable)
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{
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u64 addr, npages;
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--- a/drivers/firmware/efivars.c
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+++ b/drivers/firmware/efivars.c
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@@ -89,6 +89,7 @@ MODULE_AUTHOR("Matt Domsch <Matt_Domsch@
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MODULE_DESCRIPTION("sysfs interface to EFI Variables");
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MODULE_LICENSE("GPL");
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MODULE_VERSION(EFIVARS_VERSION);
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+MODULE_ALIAS("platform:efivars");
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#define DUMP_NAME_LEN 52
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