From: Borislav Petkov <borislav.petkov@amd.com>
Date: Wed, 7 Dec 2011 16:26:56 +0000 (+0100)
Subject: x86, microcode, AMD: Exit early on success
X-Git-Tag: next-20111220~28^2~1^2^2~1
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=d733689ad57ec332fb1e392115d83a75f35df1cf;p=karo-tx-linux.git

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 <borislav.petkov@amd.com>
---

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();