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[1/5] PCI: OF: Don't remap iospace on unsupported platform

Message ID 20200330114239.1112759-2-jiaxun.yang@flygoat.com
State New
Headers show
Series Loongson64 Generic PCI driver | expand

Commit Message

Jiaxun Yang March 30, 2020, 11:42 a.m. UTC
There are some platforms doesn't support iospace remapping
like MIPS. However, our PCI code will try to remap iospace
unconditionally and reject io resources on these platforms.

So we should remove iospace remapping check and use a range
check instead on these platforms.

Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
 drivers/pci/of.c | 9 +++++++++
 1 file changed, 9 insertions(+)
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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)) {
+#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);
+			/* Simply check if IO is inside the range */
+			if (res->end > IO_SPACE_LIMIT) {
+				dev_warn(dev, "resource %pR out of the IO range\n",
+					res);
+				resource_list_destroy_entry(win);
+			}
 			res_valid |= !(res->flags & IORESOURCE_PREFETCH);