linux-kernel - [PATCH AUTOSEL 5.4 148/175] PCI: Don't disable decoding when mmio_always

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Message-Id: <20200608231848.3366970-148-sashal@kernel.org>
Date:   Mon,  8 Jun 2020 19:18:21 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Jiaxun Yang <jiaxun.yang@...goat.com>,
        Bjorn Helgaas <helgaas@...nel.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Sasha Levin <sashal@...nel.org>, linux-pci@...r.kernel.org
Subject: [PATCH AUTOSEL 5.4 148/175] PCI: Don't disable decoding when mmio_always_on is set

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

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index d3033873395d..48209d915de3 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -1777,7 +1777,7 @@ 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");
-- 
2.25.1