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-rw-r--r--arch/x86/boot/compressed/eboot.c20
1 files changed, 17 insertions, 3 deletions
diff --git a/arch/x86/boot/compressed/eboot.c b/arch/x86/boot/compressed/eboot.c
index c205035a6b9..d606463aa6d 100644
--- a/arch/x86/boot/compressed/eboot.c
+++ b/arch/x86/boot/compressed/eboot.c
@@ -992,18 +992,20 @@ static efi_status_t exit_boot(struct boot_params *boot_params,
efi_memory_desc_t *mem_map;
efi_status_t status;
__u32 desc_version;
+ bool called_exit = false;
u8 nr_entries;
int i;
size = sizeof(*mem_map) * 32;
again:
- size += sizeof(*mem_map);
+ size += sizeof(*mem_map) * 2;
_size = size;
status = low_alloc(size, 1, (unsigned long *)&mem_map);
if (status != EFI_SUCCESS)
return status;
+get_map:
status = efi_call_phys5(sys_table->boottime->get_memory_map, &size,
mem_map, &key, &desc_size, &desc_version);
if (status == EFI_BUFFER_TOO_SMALL) {
@@ -1029,8 +1031,20 @@ again:
/* Might as well exit boot services now */
status = efi_call_phys2(sys_table->boottime->exit_boot_services,
handle, key);
- if (status != EFI_SUCCESS)
- goto free_mem_map;
+ if (status != EFI_SUCCESS) {
+ /*
+ * ExitBootServices() will fail if any of the event
+ * handlers change the memory map. In which case, we
+ * must be prepared to retry, but only once so that
+ * we're guaranteed to exit on repeated failures instead
+ * of spinning forever.
+ */
+ if (called_exit)
+ goto free_mem_map;
+
+ called_exit = true;
+ goto get_map;
+ }
/* Historic? */
boot_params->alt_mem_k = 32 * 1024;