forked from Minki/linux
efi/libstub: Use efi_exit_boot_services() in FDT
The FDT code directly calls ExitBootServices. This is inadvisable as the UEFI spec details a complex set of errors, race conditions, and API interactions that the caller of ExitBootServices must get correct. The FDT code does not handle EFI_INVALID_PARAMETER as required by the spec, which causes intermittent boot failures on the Qualcomm Technologies QDF2432. Call the efi_exit_boot_services() helper intead, which handles the EFI_INVALID_PARAMETER scenario properly. Signed-off-by: Jeffrey Hugo <jhugo@codeaurora.org> Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Leif Lindholm <leif.lindholm@linaro.org> Cc: Ingo Molnar <mingo@kernel.org> Cc: <stable@vger.kernel.org> Signed-off-by: Matt Fleming <matt@codeblueprint.co.uk>
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@ -152,6 +152,27 @@ fdt_set_fail:
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#define EFI_FDT_ALIGN EFI_PAGE_SIZE
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#endif
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struct exit_boot_struct {
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efi_memory_desc_t *runtime_map;
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int *runtime_entry_count;
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};
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static efi_status_t exit_boot_func(efi_system_table_t *sys_table_arg,
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struct efi_boot_memmap *map,
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void *priv)
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{
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struct exit_boot_struct *p = priv;
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/*
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* Update the memory map with virtual addresses. The function will also
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* populate @runtime_map with copies of just the EFI_MEMORY_RUNTIME
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* entries so that we can pass it straight to SetVirtualAddressMap()
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*/
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efi_get_virtmap(*map->map, *map->map_size, *map->desc_size,
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p->runtime_map, p->runtime_entry_count);
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return EFI_SUCCESS;
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}
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/*
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* Allocate memory for a new FDT, then add EFI, commandline, and
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* initrd related fields to the FDT. This routine increases the
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@ -183,6 +204,7 @@ efi_status_t allocate_new_fdt_and_exit_boot(efi_system_table_t *sys_table,
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efi_status_t status;
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int runtime_entry_count = 0;
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struct efi_boot_memmap map;
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struct exit_boot_struct priv;
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map.map = &runtime_map;
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map.map_size = &map_size;
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@ -257,16 +279,11 @@ efi_status_t allocate_new_fdt_and_exit_boot(efi_system_table_t *sys_table,
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}
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}
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/*
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* Update the memory map with virtual addresses. The function will also
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* populate @runtime_map with copies of just the EFI_MEMORY_RUNTIME
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* entries so that we can pass it straight into SetVirtualAddressMap()
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*/
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efi_get_virtmap(memory_map, map_size, desc_size, runtime_map,
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&runtime_entry_count);
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/* Now we are ready to exit_boot_services.*/
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status = sys_table->boottime->exit_boot_services(handle, mmap_key);
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sys_table->boottime->free_pool(memory_map);
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priv.runtime_map = runtime_map;
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priv.runtime_entry_count = &runtime_entry_count;
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status = efi_exit_boot_services(sys_table, handle, &map, &priv,
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exit_boot_func);
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if (status == EFI_SUCCESS) {
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efi_set_virtual_address_map_t *svam;
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