linux-kernel - [PATCH 5.9 120/152] efi/efivars: Set generic ops before loading SSDT

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Date:   Tue,  1 Dec 2020 09:53:55 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Amadeusz Sławiński 
        <amadeuszx.slawinski@...ux.intel.com>,
        Cezary Rojewski <cezary.rojewski@...el.com>,
        Ard Biesheuvel <ardb@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.9 120/152] efi/efivars: Set generic ops before loading SSDT

From: Amadeusz Sławiński <amadeuszx.slawinski@...ux.intel.com>

[ Upstream commit 50bdcf047503e30126327d0be4f0ad7337106d68 ]

Efivars allows for overriding of SSDT tables, however starting with
commit

  bf67fad19e493b ("efi: Use more granular check for availability for variable services")

this use case is broken. When loading SSDT generic ops should be set
first, however mentioned commit reversed order of operations. Fix this
by restoring original order of operations.

Fixes: bf67fad19e493b ("efi: Use more granular check for availability for variable services")
Signed-off-by: Amadeusz Sławiński <amadeuszx.slawinski@...ux.intel.com>
Link: https://lore.kernel.org/r/20201123172817.124146-1-amadeuszx.slawinski@linux.intel.com
Tested-by: Cezary Rojewski <cezary.rojewski@...el.com>
Signed-off-by: Ard Biesheuvel <ardb@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/firmware/efi/efi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c
index 3aa07c3b51369..8ead4379e6e85 100644
--- a/drivers/firmware/efi/efi.c
+++ b/drivers/firmware/efi/efi.c
@@ -387,10 +387,10 @@ static int __init efisubsys_init(void)
 
 	if (efi_rt_services_supported(EFI_RT_SUPPORTED_GET_VARIABLE |
 				      EFI_RT_SUPPORTED_GET_NEXT_VARIABLE_NAME)) {
-		efivar_ssdt_load();
 		error = generic_ops_register();
 		if (error)
 			goto err_put;
+		efivar_ssdt_load();
 		platform_device_register_simple("efivars", 0, NULL, 0);
 	}
 
-- 
2.27.0