PCI: Don't disable decoding when mmio_always_on is set

stable inclusion
from linux-4.19.129
commit 40a94a1ac783b878ec083b87242450949ae26eaf

--------------------------------

[ Upstream commit b6caa1d8 ]

Don't disable MEM/IO decoding when a device have both non_compliant_bars
and mmio_always_on.

That would allow us quirk devices with junk in BARs but can't disable
their decoding.
Signed-off-by: NJiaxun Yang <jiaxun.yang@flygoat.com>
Acked-by: NBjorn Helgaas <helgaas@kernel.org>
Signed-off-by: NThomas Bogendoerfer <tsbogend@alpha.franken.de>
Signed-off-by: NSasha Levin <sashal@kernel.org>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>

drivers/pci/probe.c

@@ -1690,7 +1690,7 @@ int pci_setup_device(struct pci_dev *dev)
 	/* Device class may be changed after fixup */
 	class = dev->class >> 8;
 
-	if (dev->non_compliant_bars) {
+	if (dev->non_compliant_bars && !dev->mmio_always_on) {
 		pci_read_config_word(dev, PCI_COMMAND, &cmd);
 		if (cmd & (PCI_COMMAND_IO | PCI_COMMAND_MEMORY)) {
 			pci_info(dev, "device has non-compliant BARs; disabling IO/MEM decoding\n");