[PATCH] arm64/efi: handle potential failure to remap memory map

[ard.biesheuvel@linaro.org (Ard Biesheuvel)]

When remapping the UEFI memory map using ioremap_cache(), we
have to deal with potential failure. Note that, even if the
common case is for ioremap_cache() to return the existing linear
mapping of the memory map, we cannot rely on that to be always the
case, e.g., in the presence of a mem= kernel parameter.

At the same time, remove a stale comment and move the memmap code
together.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
---
 arch/arm64/kernel/efi.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/arch/arm64/kernel/efi.c b/arch/arm64/kernel/efi.c
index a98415b5979c..c9cb0fbe7aa4 100644
--- a/arch/arm64/kernel/efi.c
+++ b/arch/arm64/kernel/efi.c
@@ -229,19 +229,21 @@ static int __init arm64_enable_runtime_services(void)
 		return -1;
 	}
 
-	mapsize = memmap.map_end - memmap.map;
-
 	if (efi_runtime_disabled()) {
 		pr_info("EFI runtime services will be disabled.\n");
 		return -1;
 	}
 
 	pr_info("Remapping and enabling EFI services.\n");
-	/* replace early memmap mapping with permanent mapping */
+
+	mapsize = memmap.map_end - memmap.map;
 	memmap.map = (__force void *)ioremap_cache((phys_addr_t)memmap.phys_map,
 						   mapsize);
+	if (!memmap.map) {
+		pr_err("Failed to remap EFI memory map\n");
+		return -1;
+	}
 	memmap.map_end = memmap.map + mapsize;
-
 	efi.memmap = &memmap;
 
 	efi.systab = (__force void *)ioremap_cache(efi_system_table,
-- 
1.8.3.2