[PATCH linux dev-5.3] soc: aspeed: Fail probe of lpc-ctrl if reserved memory is not aligned

[Andrew Jeffery]

Alignment is a hardware constraint of the LPC2AHB bridge, and misaligned
reserved memory will present as corrupted data.

Signed-off-by: Andrew Jeffery <andrew at aj.id.au>
---
 drivers/soc/aspeed/aspeed-lpc-ctrl.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/soc/aspeed/aspeed-lpc-ctrl.c b/drivers/soc/aspeed/aspeed-lpc-ctrl.c
index 12e4421dee37..5bad6a33ca43 100644
--- a/drivers/soc/aspeed/aspeed-lpc-ctrl.c
+++ b/drivers/soc/aspeed/aspeed-lpc-ctrl.c
@@ -241,6 +241,18 @@ static int aspeed_lpc_ctrl_probe(struct platform_device *pdev)
 
 		lpc_ctrl->mem_size = resource_size(&resm);
 		lpc_ctrl->mem_base = resm.start;
+
+		if (hweight32(lpc_ctrl->mem_size) != 1) {
+			dev_err(dev, "Reserved memory size must be a power of 2, got %zu\n",
+			       lpc_ctrl->mem_size);
+			return -EINVAL;
+		}
+
+		if (lpc_ctrl->mem_base & (lpc_ctrl->mem_size - 1)) {
+			dev_err(dev, "Reserved memory must be naturally aligned for size %zu\n",
+			       lpc_ctrl->mem_size);
+			return -EINVAL;
+		}
 	}
 
 	lpc_ctrl->regmap = syscon_node_to_regmap(
-- 
2.20.1