[PATCH 1/3] platform/x86: ISST: Check for unaligned mmio address

[Srinivas Pandruvada]

The address should be aligned to 4 byte boundary. So send an error for
unaligned address.

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@xxxxxxxxxxxxxxx>
---
 drivers/platform/x86/intel_speed_select_if/isst_if_mmio.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/platform/x86/intel_speed_select_if/isst_if_mmio.c b/drivers/platform/x86/intel_speed_select_if/isst_if_mmio.c
index aa17fd7817f8..e7e9808a1aed 100644
--- a/drivers/platform/x86/intel_speed_select_if/isst_if_mmio.c
+++ b/drivers/platform/x86/intel_speed_select_if/isst_if_mmio.c
@@ -42,6 +42,9 @@ static long isst_if_mmio_rd_wr(u8 *cmd_ptr, int *write_only, int resume)
 	if (io_reg->reg < 0x04 || io_reg->reg > 0xD0)
 		return -EINVAL;
 
+	if (io_reg->reg % 4)
+		return -EINVAL;
+
 	if (io_reg->read_write && !capable(CAP_SYS_ADMIN))
 		return -EPERM;
 
-- 
2.25.4