linux-kernel - [tip:x86/mce] x86/microcode/AMD: Simplify saving from initrd

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Message-ID: <tip-72edfe950b36308353e27cdc02f334431239938a@git.kernel.org>
Date:   Mon, 23 Jan 2017 01:13:51 -0800
From:   tip-bot for Borislav Petkov <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     tglx@...utronix.de, linux-kernel@...r.kernel.org, mingo@...nel.org,
        bp@...e.de, hpa@...or.com
Subject: [tip:x86/mce] x86/microcode/AMD: Simplify saving from initrd

Commit-ID:  72edfe950b36308353e27cdc02f334431239938a
Gitweb:     http://git.kernel.org/tip/72edfe950b36308353e27cdc02f334431239938a
Author:     Borislav Petkov <bp@...e.de>
AuthorDate: Fri, 20 Jan 2017 21:29:53 +0100
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Mon, 23 Jan 2017 10:02:50 +0100

x86/microcode/AMD: Simplify saving from initrd

No need to use the previously stashed info in the container - simply go
ahead and parse the initrd once more. It simplifies and streamlines the
code a whole lot.

Signed-off-by: Borislav Petkov <bp@...e.de>
Reviewed-by: Thomas Gleixner <tglx@...utronix.de>
Link: http://lkml.kernel.org/r/20170120202955.4091-15-bp@alien8.de
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>

---
 arch/x86/kernel/cpu/microcode/amd.c | 43 +++++++++++--------------------------
 1 file changed, 13 insertions(+), 30 deletions(-)

diff --git a/arch/x86/kernel/cpu/microcode/amd.c b/arch/x86/kernel/cpu/microcode/amd.c
index fe9e865..2a194e3 100644
--- a/arch/x86/kernel/cpu/microcode/amd.c
+++ b/arch/x86/kernel/cpu/microcode/amd.c
@@ -372,43 +372,26 @@ load_microcode_amd(int cpu, u8 family, const u8 *data, size_t size);
 
 int __init save_microcode_in_initrd_amd(unsigned int cpuid_1_eax)
 {
+	struct cont_desc desc = { 0 };
 	enum ucode_state ret;
-	int retval = 0;
-
-	if (!cont.data) {
-		if (IS_ENABLED(CONFIG_X86_32) && (cont.size != -1)) {
-			struct cpio_data cp;
-
-			cp = find_microcode_in_initrd(ucode_path, false);
-			if (!(cp.data && cp.size)) {
-				cont.size = -1;
-				return -EINVAL;
-			}
+	struct cpio_data cp;
 
-			cont.cpuid_1_eax = cpuid_1_eax;
+	cp = find_microcode_in_initrd(ucode_path, false);
+	if (!(cp.data && cp.size))
+		return -EINVAL;
 
-			scan_containers(cp.data, cp.size, &cont);
-			if (!cont.eq_id) {
-				cont.size = -1;
-				return -EINVAL;
-			}
+	desc.cpuid_1_eax = cpuid_1_eax;
 
-		} else
-			return -EINVAL;
-	}
+	scan_containers(cp.data, cp.size, &desc);
+	if (!desc.eq_id)
+		return -EINVAL;
 
-	ret = load_microcode_amd(smp_processor_id(), x86_family(cpuid_1_eax), cont.data, cont.size);
+	ret = load_microcode_amd(smp_processor_id(), x86_family(cpuid_1_eax),
+				 desc.data, desc.size);
 	if (ret != UCODE_OK)
-		retval = -EINVAL;
-
-	/*
-	 * This will be freed any msec now, stash patches for the current
-	 * family and switch to patch cache for cpu hotplug, etc later.
-	 */
-	cont.data = NULL;
-	cont.size = 0;
+		return -EINVAL;
 
-	return retval;
+	return 0;
 }
 
 void reload_ucode_amd(void)