linux-kernel - [PATCH] x86/microcode: Initialize the driver late when facilities are up

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Message-ID: <20151120112400.GC4028@pd.tnic>
Date:	Fri, 20 Nov 2015 12:24:00 +0100
From:	Borislav Petkov <bp@...e.de>
To:	x86-ml <x86@...nel.org>
Cc:	Markus Trippelsdorf <markus@...ppelsdorf.de>,
	linux-kernel@...r.kernel.org
Subject: [PATCH] x86/microcode: Initialize the driver late when facilities
 are up

From: Borislav Petkov <bp@...e.de>
Date: Fri, 20 Nov 2015 00:05:24 +0100
Subject: [PATCH] x86/microcode: Initialize the driver late when facilities are up

Running microcode_init() from setup_arch() is a bad idea because not
even kmalloc() is ready at that point and the loader does all kinds of
allocations and init/registration with various subsystems.

Make it a late initcall when required facilities are initialized so that
the microcode driver initialization can succeed too.

Reported-and-tested-by: Markus Trippelsdorf <markus@...ppelsdorf.de>
Signed-off-by: Borislav Petkov <bp@...e.de>
---
 arch/x86/kernel/cpu/microcode/core.c | 1 +
 arch/x86/kernel/setup.c              | 2 --
 2 files changed, 1 insertion(+), 2 deletions(-)

diff --git a/arch/x86/kernel/cpu/microcode/core.c b/arch/x86/kernel/cpu/microcode/core.c
index 7fc27f1cca58..b3e94ef461fd 100644
--- a/arch/x86/kernel/cpu/microcode/core.c
+++ b/arch/x86/kernel/cpu/microcode/core.c
@@ -698,3 +698,4 @@ int __init microcode_init(void)
 	return error;
 
 }
+late_initcall(microcode_init);
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index 29db25f9a745..d2bbe343fda7 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -1250,8 +1250,6 @@ void __init setup_arch(char **cmdline_p)
 	if (efi_enabled(EFI_BOOT))
 		efi_apply_memmap_quirks();
 #endif
-
-	microcode_init();
 }
 
 #ifdef CONFIG_X86_32
-- 
2.3.5

SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)
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