linux-kernel - [tip:x86/microcode] x86/microcode: Fix the ancient deprecated microcode loading method

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Message-ID: <tip-24613a04ad1c0588c10f4b5403ca60a73d164051@git.kernel.org>
Date:   Wed, 10 Apr 2019 13:49:56 -0700
From:   tip-bot for Borislav Petkov <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     tglx@...utronix.de, jannh@...gle.com, linux-kernel@...r.kernel.org,
        bp@...e.de, hpa@...or.com, mingo@...nel.org
Subject: [tip:x86/microcode] x86/microcode: Fix the ancient deprecated
 microcode loading method

Commit-ID:  24613a04ad1c0588c10f4b5403ca60a73d164051
Gitweb:     https://git.kernel.org/tip/24613a04ad1c0588c10f4b5403ca60a73d164051
Author:     Borislav Petkov <bp@...e.de>
AuthorDate: Thu, 4 Apr 2019 22:14:07 +0200
Committer:  Borislav Petkov <bp@...e.de>
CommitDate: Wed, 10 Apr 2019 22:41:24 +0200

x86/microcode: Fix the ancient deprecated microcode loading method

Commit

  2613f36ed965 ("x86/microcode: Attempt late loading only when new microcode is present")

added the new define UCODE_NEW to denote that an update should happen
only when newer microcode (than installed on the system) has been found.

But it missed adjusting that for the old /dev/cpu/microcode loading
interface. Fix it.

Fixes: 2613f36ed965 ("x86/microcode: Attempt late loading only when new microcode is present")
Signed-off-by: Borislav Petkov <bp@...e.de>
Reviewed-by: Thomas Gleixner <tglx@...utronix.de>
Cc: Jann Horn <jannh@...gle.com>
Link: https://lkml.kernel.org/r/20190405133010.24249-3-bp@alien8.de
---
 arch/x86/kernel/cpu/microcode/core.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/microcode/core.c b/arch/x86/kernel/cpu/microcode/core.c
index 5260185cbf7b..8a4a7823451a 100644
--- a/arch/x86/kernel/cpu/microcode/core.c
+++ b/arch/x86/kernel/cpu/microcode/core.c
@@ -418,8 +418,9 @@ static int do_microcode_update(const void __user *buf, size_t size)
 		if (ustate == UCODE_ERROR) {
 			error = -1;
 			break;
-		} else if (ustate == UCODE_OK)
+		} else if (ustate == UCODE_NEW) {
 			apply_microcode_on_target(cpu);
+		}
 	}
 
 	return error;