[PATCH RFC 09/15] arm_mpam: Fix MSC MMIO window size to use resource_size() instead of end - start

[Yin Li]

struct resource uses an inclusive end address, so the correct size is
end - start + 1. The previous calculation of end - start was off by one,
resulting in a mapped window one byte smaller than the actual resource.
Use resource_size() which correctly computes end - start + 1.

Signed-off-by: Yin Li <yin.li@xxxxxxxxxxxxxxxx>
---
 drivers/resctrl/mpam_devices.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/resctrl/mpam_devices.c b/drivers/resctrl/mpam_devices.c
index 1e082fb60e30..5d1854d97371 100644
--- a/drivers/resctrl/mpam_devices.c
+++ b/drivers/resctrl/mpam_devices.c
@@ -2296,7 +2296,7 @@ static struct mpam_msc *do_mpam_msc_drv_probe(struct platform_device *pdev)
 			dev_err_once(dev, "Failed to map MSC base address\n");
 			return ERR_CAST(io);
 		}
-		msc->mapped_hwpage_sz = msc_res->end - msc_res->start;
+		msc->mapped_hwpage_sz = resource_size(msc_res);
 		msc->mapped_hwpage = io;
 	} else {
 		return ERR_PTR(-EINVAL);

-- 
2.34.1