efi/gop: Return EFI_SUCCESS if a usable GOP was found

[ 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@alum.mit.edu>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Bhupesh Sharma <bhsharma@redhat.com>
Cc: Masayoshi Mizuma <m.mizuma@jp.fujitsu.com>
Cc: linux-efi@vger.kernel.org
Link: https://lkml.kernel.org/r/20191206165542.31469-4-ardb@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/firmware/efi/libstub/gop.c b/drivers/firmware/efi/libstub/gop.c
index 16ed61c023e8ecf84ff051cab4bae491af8bfb9a..81ffda5d1e48fb17c9d30047441dc5803f8bb124 100644 (file)
--- 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;
 }
 
 /*