powerpc: Fix size calculation using resource_size()

[ Upstream commit c42d3be0c06f0c1c416054022aa535c08a1f9b39 ]

The problem is the the calculation should be "end - start + 1" but the
plus one is missing in this calculation.

Fixes: 8626816e905e ("powerpc: add support for MPIC message register API")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Tyrel Datwyler <tyreld@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/powerpc/sysdev/mpic_msgr.c b/arch/powerpc/sysdev/mpic_msgr.c
index eb69a51862431cccc81034f1fb9a1c8decc906d2..280e964e1aa8873db4491f42df93ddc115e85509 100644 (file)
--- a/arch/powerpc/sysdev/mpic_msgr.c
+++ b/arch/powerpc/sysdev/mpic_msgr.c
@@ -196,7 +196,7 @@ static int mpic_msgr_probe(struct platform_device *dev)
 
        /* IO map the message register block. */
        of_address_to_resource(np, 0, &rsrc);
-       msgr_block_addr = ioremap(rsrc.start, rsrc.end - rsrc.start);
+       msgr_block_addr = ioremap(rsrc.start, resource_size(&rsrc));
        if (!msgr_block_addr) {
                dev_err(&dev->dev, "Failed to iomap MPIC message registers");
                return -EFAULT;