[PATCH 5.15 801/917] mfd: altera-sysmgr: Fix a mistake caused by resource_size conversion

From: Kai Song <redacted>

[ Upstream commit fae2570d629cdd72f0611d015fc4ba705ae5422b ]

The resource_size defines that:
	res->end - res->start + 1;
The origin original code is:
	sysmgr_config.max_register = res->end - res->start - 3;

So, the correct fix is that:
	sysmgr_config.max_register = resource_size(res) - 4;

Fixes: d12edf9661a4 ("mfd: altera-sysmgr: Use resource_size function on resource object")
Signed-off-by: Kai Song <redacted>
Signed-off-by: Lee Jones <redacted>
Link: https://lore.kernel.org/r/20211006141926.6120-1-songkai01@inspur.com (local)
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/mfd/altera-sysmgr.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mfd/altera-sysmgr.c b/drivers/mfd/altera-sysmgr.c
index 20cb294c75122..5d3715a28b28e 100644
--- a/drivers/mfd/altera-sysmgr.c
+++ b/drivers/mfd/altera-sysmgr.c

@@ -153,7 +153,7 @@ static int sysmgr_probe(struct platform_device *pdev)
 		if (!base)
 			return -ENOMEM;
 
-		sysmgr_config.max_register = resource_size(res) - 3;
+		sysmgr_config.max_register = resource_size(res) - 4;
 		regmap = devm_regmap_init_mmio(dev, base, &sysmgr_config);
 	}
 

-- 
2.33.0