From d3768d885c6ccbf8a137276843177d76c49033a7 Mon Sep 17 00:00:00 2001 From: Zach Bobroff Date: Fri, 7 Jun 2013 13:02:50 +0100 Subject: [PATCH] x86, efi: retry ExitBootServices() on failure ExitBootServices is absolutely supposed to return a failure if any ExitBootServices event handler changes the memory map. Basically the get_map loop should run again if ExitBootServices returns an error the first time. I would say it would be fair that if ExitBootServices gives an error the second time then Linux would be fine in returning control back to BIOS. The second change is the following line: again: size += sizeof(*mem_map) * 2; Originally you were incrementing it by the size of one memory map entry. The issue here is all related to the low_alloc routine you are using. In this routine you are making allocations to get the memory map itself. Doing this allocation or allocations can affect the memory map by more than one record. [ mfleming - changelog, code style ] Signed-off-by: Zach Bobroff Cc: Signed-off-by: Matt Fleming --- arch/x86/boot/compressed/eboot.c | 20 +++++++++++++++++--- 1 file changed, 17 insertions(+), 3 deletions(-) diff --git a/arch/x86/boot/compressed/eboot.c b/arch/x86/boot/compressed/eboot.c index 35ee62fccf98..7c6e5d957cc5 100644 --- a/arch/x86/boot/compressed/eboot.c +++ b/arch/x86/boot/compressed/eboot.c @@ -1037,18 +1037,20 @@ 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) { @@ -1074,8 +1076,20 @@ 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; -- 2.20.1