From d733689ad57ec332fb1e392115d83a75f35df1cf Mon Sep 17 00:00:00 2001 From: Borislav Petkov Date: Wed, 7 Dec 2011 17:26:56 +0100 Subject: [PATCH] x86, microcode, AMD: Exit early on success Once we've found and validated the ucode patch for the current CPU, there's no need to iterate over the remaining patches in the binary image. Exit then and save us a bunch of cycles. Signed-off-by: Borislav Petkov --- arch/x86/kernel/microcode_amd.c | 22 +++++++++------------- 1 file changed, 9 insertions(+), 13 deletions(-) diff --git a/arch/x86/kernel/microcode_amd.c b/arch/x86/kernel/microcode_amd.c index 384990d2c54d..d80e943a39f3 100644 --- a/arch/x86/kernel/microcode_amd.c +++ b/arch/x86/kernel/microcode_amd.c @@ -282,11 +282,11 @@ generic_load_microcode(int cpu, const u8 *data, size_t size) mc_hdr = patch; new_mc = patch; new_rev = mc_hdr->patch_id; - leftover -= mc_size; - } else { - ucode_ptr += current_size; - leftover -= current_size; + goto out_ok; } + + ucode_ptr += current_size; + leftover -= current_size; } if (!new_mc) { @@ -294,15 +294,11 @@ generic_load_microcode(int cpu, const u8 *data, size_t size) goto free_table; } - if (!leftover) { - uci->mc = new_mc; - state = UCODE_OK; - pr_debug("CPU%d update ucode (0x%08x -> 0x%08x)\n", - cpu, uci->cpu_sig.rev, new_rev); - } else { - new_mc = NULL; - state = UCODE_ERROR; - } +out_ok: + uci->mc = new_mc; + state = UCODE_OK; + pr_debug("CPU%d update ucode (0x%08x -> 0x%08x)\n", + cpu, uci->cpu_sig.rev, new_rev); free_table: free_equiv_cpu_table(); -- 2.39.5