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x86/microcode/AMD: Do not return error when microcode update is not necessary

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[ Upstream commit b43dc4ab097859c24e2a6993119c927cffc856aa ]

After

  6f059e634dcd("x86/microcode: Clarify the late load logic"),

if the load is up-to-date, the AMD side returns UCODE_OK which leads to
load_late_locked() returning -EBADFD.

Handle UCODE_OK in the switch case to avoid this error.

  [ bp: Massage commit message. ]

Fixes: 6f059e634d ("x86/microcode: Clarify the late load logic")
Signed-off-by: Annie Li <jiayanli@google.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/20250430053424.77438-1-jiayanli@google.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Annie Li 2025-04-30 05:34:24 +00:00 committed by Greg Kroah-Hartman
parent 4fb2231089
commit ce167ff4cd
1 changed files with 2 additions and 0 deletions
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2
arch/x86/kernel/cpu/microcode/core.c
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@ -703,6 +703,8 @@ static int load_late_locked(void)
return load_late_stop_cpus(true); return load_late_stop_cpus(true);
case UCODE_NFOUND: case UCODE_NFOUND:
return -ENOENT; return -ENOENT;
case UCODE_OK:
return 0;
default: default:
return -EBADFD; return -EBADFD;
} }