diff options
| author | Andrew Jeffery <andrew@aj.id.au> | 2019-10-17 02:39:50 +0300 |
|---|---|---|
| committer | Joel Stanley <joel@jms.id.au> | 2020-09-25 07:38:14 +0300 |
| commit | 6bf4ddbe2b4805f0628922446a7e85e34013cd10 (patch) | |
| tree | 45d3dda2fd7830059cc6b7173eb8c4e2858c953e /drivers/soc | |
| parent | 44ddc4de87a54b32ead77d3ec67f0bf93d8c0055 (diff) | |
| download | linux-6bf4ddbe2b4805f0628922446a7e85e34013cd10.tar.xz | |
soc: aspeed-lpc-ctrl: Fail probe of lpc-ctrl if reserved memory is not aligned
Alignment is a hardware constraint of the LPC2AHB bridge, and misaligned
reserved memory will present as corrupted data.
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
Reviewed-by: Joel Stanley <joel@jms.id.au>
Link: https://lore.kernel.org/r/20191016233950.10100-1-andrew@aj.id.au
Signed-off-by: Joel Stanley <joel@jms.id.au>
Diffstat (limited to 'drivers/soc')
| -rw-r--r-- | drivers/soc/aspeed/aspeed-lpc-ctrl.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/soc/aspeed/aspeed-lpc-ctrl.c b/drivers/soc/aspeed/aspeed-lpc-ctrl.c index 12e4421dee37..d8f3dff97cd4 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( |