linux-kernel - [PATCH] efi: Return EFI_RESERVED_TYPE in efi_mem

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Date:   Tue,  5 Nov 2019 10:53:49 +0530
From:   Anshuman Khandual <anshuman.khandual@....com>
To:     linux-kernel@...r.kernel.org, linux-efi@...r.kernel.org
Cc:     Anshuman Khandual <anshuman.khandual@....com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>
Subject: [PATCH] efi: Return EFI_RESERVED_TYPE in efi_mem_type() for absent addresses

The function efi_mem_type() is expected (per documentation above) to return
EFI_RESERVED_TYPE when a given physical address is not present in the EFI
memory map. Even though EFI_RESERVED_TYPE is not getting checked explicitly
anywhere in the callers, it is always better to return expected values.

Cc: Ard Biesheuvel <ard.biesheuvel@...aro.org>
Cc: linux-efi@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>
---
 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 69f00f7453a3..bdda90a4601e 100644
--- a/drivers/firmware/efi/efi.c
+++ b/drivers/firmware/efi/efi.c
@@ -914,7 +914,7 @@ int efi_mem_type(unsigned long phys_addr)
 				  (md->num_pages << EFI_PAGE_SHIFT))))
 			return md->type;
 	}
-	return -EINVAL;
+	return EFI_RESERVED_TYPE;
 }
 #endif
 
-- 
2.20.1