[4.19,174/267] PCI: Dont disable decoding when mmio_always_on is set

Message ID 20200619141657.136698762@linuxfoundation.org
State New
Headers show
Series
  • Untitled series #28331
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Commit Message

Greg Kroah-Hartman June 19, 2020, 2:32 p.m.
From: Jiaxun Yang <jiaxun.yang@flygoat.com>

[ Upstream commit b6caa1d8c80cb71b6162cb1f1ec13aa655026c9f ]

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: Jiaxun Yang <jiaxun.yang@flygoat.com>
Acked-by: Bjorn Helgaas <helgaas@kernel.org>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/pci/probe.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Patch

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index fa4c386c8cd8..a21c04d8a40b 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -1634,7 +1634,7 @@  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");