From: Zhichang Yuan <yuanzhichang@xxxxxxxxxxxxx>
This patch has been added to the 3.18 stable tree. If you have any
objections, please let us know.
===============
[ Upstream commit 5dbb4c6167229c8d4f528e8ec26699a7305000a3 ]
41f8bba7f555 ("of/pci: Add pci_register_io_range() and
pci_pio_to_address()") added support for systems with several I/O ranges
described by OF bindings. It modified pci_address_to_pio() look up the
io_range for a given CPU physical address, but the conversion was wrong.
Fix the conversion of address to I/O port.
[bhelgaas: changelog]
Fixes: 41f8bba7f555 ("of/pci: Add pci_register_io_range() and pci_pio_to_address()")
Signed-off-by: Zhichang Yuan <yuanzhichang@xxxxxxxxxxxxx>
Signed-off-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
Acked-by: Liviu Dudau <Liviu.Dudau@xxxxxxx>
CC: stable@xxxxxxxxxxxxxxx # v3.18+
Signed-off-by: Sasha Levin <sasha.levin@xxxxxxxxxx>
---
drivers/of/address.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/of/address.c b/drivers/of/address.c
index 216b00d..d880aff 100644
--- a/drivers/of/address.c
+++ b/drivers/of/address.c
@@ -765,7 +765,7 @@ unsigned long __weak pci_address_to_pio(phys_addr_t address)
spin_lock(&io_range_lock);
list_for_each_entry(res, &io_range_list, list) {
if (address >= res->start && address < res->start + res->size) {
- addr = res->start - address + offset;
+ addr = address - res->start + offset;
break;
}
offset += res->size;
--
2.1.0
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