As per http://infocenter.arm.com/help/topic/com.arm.doc.den0049d/DEN0049D_IO_Remapping_Table.pdf in ID mappings: Number of IDs = The number of IDs in the range minus one. Therefore, it's valid for ID mapping to contain single device mapping which would have Number of IDs field 0. The iort_id_map doesn't handle this case, fix this case. Signed-off-by: Pankaj Bansal <pankaj.bansal@xxxxxxx> --- drivers/acpi/arm64/iort.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c index 33f71983e001..b9b108d0ca0b 100644 --- a/drivers/acpi/arm64/iort.c +++ b/drivers/acpi/arm64/iort.c @@ -315,7 +315,7 @@ static int iort_id_map(struct acpi_iort_id_mapping *map, u8 type, u32 rid_in, } if (rid_in < map->input_base || - (rid_in >= map->input_base + map->id_count)) + (rid_in > map->input_base + map->id_count)) return -ENXIO; *rid_out = map->output_base + (rid_in - map->input_base); -- 2.17.1
