[PATCH AUTOSEL 5.10 001/217] soc: aspeed-lpc-ctrl: Fail probe of lpc-ctrl if reserved memory is not aligned
From: Sasha Levin
Date: Tue Dec 22 2020 - 21:17:27 EST
From: Andrew Jeffery <andrew@xxxxxxxx>
[ Upstream commit 6bf4ddbe2b4805f0628922446a7e85e34013cd10 ]
Alignment is a hardware constraint of the LPC2AHB bridge, and misaligned
reserved memory will present as corrupted data.
Signed-off-by: Andrew Jeffery <andrew@xxxxxxxx>
Reviewed-by: Joel Stanley <joel@xxxxxxxxx>
Link: https://lore.kernel.org/r/20191016233950.10100-1-andrew@xxxxxxxx
Signed-off-by: Joel Stanley <joel@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/soc/aspeed/aspeed-lpc-ctrl.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/drivers/soc/aspeed/aspeed-lpc-ctrl.c b/drivers/soc/aspeed/aspeed-lpc-ctrl.c
index 01ed21e8bfee5..dd147af494fdf 100644
--- a/drivers/soc/aspeed/aspeed-lpc-ctrl.c
+++ b/drivers/soc/aspeed/aspeed-lpc-ctrl.c
@@ -4,6 +4,7 @@
*/
#include <linux/clk.h>
+#include <linux/log2.h>
#include <linux/mfd/syscon.h>
#include <linux/miscdevice.h>
#include <linux/mm.h>
@@ -241,6 +242,18 @@ static int aspeed_lpc_ctrl_probe(struct platform_device *pdev)
lpc_ctrl->mem_size = resource_size(&resm);
lpc_ctrl->mem_base = resm.start;
+
+ if (!is_power_of_2(lpc_ctrl->mem_size)) {
+ dev_err(dev, "Reserved memory size must be a power of 2, got %u\n",
+ (unsigned int)lpc_ctrl->mem_size);
+ return -EINVAL;
+ }
+
+ if (!IS_ALIGNED(lpc_ctrl->mem_base, lpc_ctrl->mem_size)) {
+ dev_err(dev, "Reserved memory must be naturally aligned for size %u\n",
+ (unsigned int)lpc_ctrl->mem_size);
+ return -EINVAL;
+ }
}
lpc_ctrl->regmap = syscon_node_to_regmap(
--
2.27.0