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x86/microcode: Move away from using a fake platform device

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Downloading firmware needs a device to hang off of, and so a platform device
seemed like the simplest way to do this.  Now that we have a faux device
interface, use that instead as this "microcode device" is not anything
resembling a platform device at all.

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Sohil Mehta <sohil.mehta@intel.com>
Link: https://lore.kernel.org/2025070121-omission-small-9308@gregkh
This commit is contained in:
Greg Kroah-Hartman 2025-07-01 12:54:22 +02:00 committed by Borislav Petkov (AMD)
parent d7b8f8e208
commit 9b355cdb63
1 changed files with 7 additions and 7 deletions
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14
arch/x86/kernel/cpu/microcode/core.c
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@ -17,8 +17,8 @@
#define pr_fmt(fmt) "microcode: " fmt
#include <linux/platform_device.h>
#include <linux/stop_machine.h>
#include <linux/device/faux.h>
#include <linux/syscore_ops.h>
#include <linux/miscdevice.h>
#include <linux/capability.h>
@ -249,7 +249,7 @@ static void reload_early_microcode(unsigned int cpu)
}
/* fake device for request_firmware */
static struct platform_device *microcode_pdev;
static struct faux_device *microcode_fdev;
#ifdef CONFIG_MICROCODE_LATE_LOADING
/*
@ -690,7 +690,7 @@ static int load_late_locked(void)
if (!setup_cpus())
return -EBUSY;
switch (microcode_ops->request_microcode_fw(0, &microcode_pdev->dev)) {
switch (microcode_ops->request_microcode_fw(0, &microcode_fdev->dev)) {
case UCODE_NEW:
return load_late_stop_cpus(false);
case UCODE_NEW_SAFE:
@ -841,9 +841,9 @@ static int __init microcode_init(void)
if (early_data.new_rev)
pr_info_once("Updated early from: 0x%08x\n", early_data.old_rev);
microcode_pdev = platform_device_register_simple("microcode", -1, NULL, 0);
if (IS_ERR(microcode_pdev))
return PTR_ERR(microcode_pdev);
microcode_fdev = faux_device_create("microcode", NULL, NULL);
if (!microcode_fdev)
return -ENODEV;
dev_root = bus_get_dev_root(&cpu_subsys);
if (dev_root) {
@ -862,7 +862,7 @@ static int __init microcode_init(void)
return 0;
out_pdev:
platform_device_unregister(microcode_pdev);
faux_device_destroy(microcode_fdev);
return error;
}