linux-kernel - [PATCH 4.14 09/62] efi/gop: Return EFI

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Date:   Sat, 11 Jan 2020 10:49:51 +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, Arvind Sankar <nivedita@...m.mit.edu>,
        Ard Biesheuvel <ardb@...nel.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Bhupesh Sharma <bhsharma@...hat.com>,
        Masayoshi Mizuma <m.mizuma@...fujitsu.com>,
        linux-efi@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.14 09/62] efi/gop: Return EFI_SUCCESS if a usable GOP was found

From: Arvind Sankar <nivedita@...m.mit.edu>

[ Upstream commit dbd89c303b4420f6cdb689fd398349fc83b059dd ]

If we've found a usable instance of the Graphics Output Protocol
(GOP) with a framebuffer, it is possible that one of the later EFI
calls fails while checking if any support console output. In this
case status may be an EFI error code even though we found a usable
GOP.

Fix this by explicitly return EFI_SUCCESS if a usable GOP has been
located.

Signed-off-by: Arvind Sankar <nivedita@...m.mit.edu>
Signed-off-by: Ard Biesheuvel <ardb@...nel.org>
Cc: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc: Bhupesh Sharma <bhsharma@...hat.com>
Cc: Masayoshi Mizuma <m.mizuma@...fujitsu.com>
Cc: linux-efi@...r.kernel.org
Link: https://lkml.kernel.org/r/20191206165542.31469-4-ardb@kernel.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/firmware/efi/libstub/gop.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/firmware/efi/libstub/gop.c b/drivers/firmware/efi/libstub/gop.c
index 16ed61c023e8..81ffda5d1e48 100644
--- a/drivers/firmware/efi/libstub/gop.c
+++ b/drivers/firmware/efi/libstub/gop.c
@@ -200,7 +200,7 @@ setup_gop32(efi_system_table_t *sys_table_arg, struct screen_info *si,
 
 	si->capabilities |= VIDEO_CAPABILITY_SKIP_QUIRKS;
 
-	return status;
+	return EFI_SUCCESS;
 }
 
 static efi_status_t
@@ -318,7 +318,7 @@ setup_gop64(efi_system_table_t *sys_table_arg, struct screen_info *si,
 
 	si->capabilities |= VIDEO_CAPABILITY_SKIP_QUIRKS;
 
-	return status;
+	return EFI_SUCCESS;
 }
 
 /*
-- 
2.20.1