There are some platforms that don't support I/O space remapping
like MIPS. However, our PCI code will try to remap iospace
unconditionally and reject io resources on these platforms.
So we should remove I/O space remapping check and use a range
check instead on these platforms.
Signed-off-by: Jiaxun Yang <jiaxun.yang@xxxxxxxxxxx>
--
v4: Fix a typo in commit message.
v5: Commit message massage
---
drivers/pci/of.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/drivers/pci/of.c b/drivers/pci/of.c
index 81ceeaa6f1d5..36e8761b66c6 100644
--- a/drivers/pci/of.c
+++ b/drivers/pci/of.c
@@ -547,12 +547,21 @@ int pci_parse_request_of_pci_ranges(struct device *dev,
switch (resource_type(res)) {
case IORESOURCE_IO:
+#if defined(PCI_IOBASE) && defined(CONFIG_MMU)
err = devm_pci_remap_iospace(dev, res, iobase);
if (err) {
dev_warn(dev, "error %d: failed to map resource %pR\n",
err, res);
resource_list_destroy_entry(win);
}
+#else
+ /* Simply check if IO is inside the range */
+ if (res->end > IO_SPACE_LIMIT) {
+ dev_warn(dev, "resource %pR out of the I/O range\n",
+ res);
+ resource_list_destroy_entry(win);
+ }
+#endif
break;
case IORESOURCE_MEM:
res_valid |= !(res->flags & IORESOURCE_PREFETCH);
--
2.26.0.rc2
