um: virt-pci: fix platform map offset

[ Upstream commit 32253f00ac8a8073bf6db4bfe9d6511cc93c4aef ]

The offset is currently always zero so the backend can't distinguish
between accesses to different ioremapped areas.

Fixes: 522c532c4fe7 ("virt-pci: add platform bus support")
Signed-off-by: Vincent Whitchurch <vincent.whitchurch@axis.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/arch/um/drivers/virt-pci.c b/arch/um/drivers/virt-pci.c
index ffe2ee8..97a37c0 100644 (file)
--- a/arch/um/drivers/virt-pci.c
+++ b/arch/um/drivers/virt-pci.c
@@ -971,7 +971,7 @@ static long um_pci_map_platform(unsigned long offset, size_t size,
        *ops = &um_pci_device_bar_ops;
        *priv = &um_pci_platform_device->resptr[0];
 
-       return 0;
+       return offset;
 }
 
 static const struct logic_iomem_region_ops um_pci_platform_ops = {