[PATCH] x86/boot: clear rsdp address in boot_params for broken loaders

[Juergen Gross]

In case a broken boot loader doesn't clear its struct boot_params clear
rsdp_addr in sanitize_boot_params().

This fixes commit e6e094e053af75 ("x86/acpi, x86/boot: Take RSDP
address from boot params if available") e.g. for the case of a boot via
systemd-boot.

Fixes: e6e094e053af75 ("x86/acpi, x86/boot: Take RSDP address from boot params if available")
Reported-by: Gunnar Krueger <taijian@xxxxxxxxx>
Tested-by: Gunnar Krueger <taijian@xxxxxxxxx>
Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
---
 arch/x86/include/asm/bootparam_utils.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/include/asm/bootparam_utils.h b/arch/x86/include/asm/bootparam_utils.h
index a07ffd23e4dd..f6f6ef436599 100644
--- a/arch/x86/include/asm/bootparam_utils.h
+++ b/arch/x86/include/asm/bootparam_utils.h
@@ -36,6 +36,7 @@ static void sanitize_boot_params(struct boot_params *boot_params)
 	 */
 	if (boot_params->sentinel) {
 		/* fields in boot_params are left uninitialized, clear them */
+		boot_params->acpi_rsdp_addr = 0;
 		memset(&boot_params->ext_ramdisk_image, 0,
 		       (char *)&boot_params->efi_info -
 			(char *)&boot_params->ext_ramdisk_image);
-- 
2.16.4