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authorPrarit Bhargava <prarit@redhat.com>2016-05-11 12:27:16 -0400
committerBjorn Helgaas <bhelgaas@google.com>2016-05-16 15:57:56 -0500
commitad67b437f187ea818b2860524d10f878fadfdd99 (patch)
tree75c7ce95fcd0000f22fe303792130552d667c15d /drivers/pci
parentda77b67195de1c65bef4908fa29967c4d0af2da2 (diff)
downloadlinux-ad67b437f187ea818b2860524d10f878fadfdd99.tar.bz2
PCI: Disable all BAR sizing for devices with non-compliant BARs
b84106b4e229 ("PCI: Disable IO/MEM decoding for devices with non-compliant BARs") disabled BAR sizing for BARs 0-5 of devices that don't comply with the PCI spec. But it didn't do anything for expansion ROM BARs, so we still try to size them, resulting in warnings like this on Broadwell-EP: pci 0000:ff:12.0: BAR 6: failed to assign [mem size 0x00000001 pref] Move the non-compliant BAR check from __pci_read_base() up to pci_read_bases() so it applies to the expansion ROM BAR as well as to BARs 0-5. Note that direct callers of __pci_read_base(), like sriov_init(), will now bypass this check. We haven't had reports of devices with broken SR-IOV BARs yet. [bhelgaas: changelog] Fixes: b84106b4e229 ("PCI: Disable IO/MEM decoding for devices with non-compliant BARs") Signed-off-by: Prarit Bhargava <prarit@redhat.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> CC: stable@vger.kernel.org CC: Thomas Gleixner <tglx@linutronix.de> CC: Ingo Molnar <mingo@redhat.com> CC: "H. Peter Anvin" <hpa@zytor.com> CC: Andi Kleen <ak@linux.intel.com>
Diffstat (limited to 'drivers/pci')
-rw-r--r--drivers/pci/probe.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 8004f67c57ec..bf8405fb4ace 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -179,9 +179,6 @@ int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type,
u16 orig_cmd;
struct pci_bus_region region, inverted_region;
- if (dev->non_compliant_bars)
- return 0;
-
mask = type ? PCI_ROM_ADDRESS_MASK : ~0;
/* No printks while decoding is disabled! */
@@ -322,6 +319,9 @@ static void pci_read_bases(struct pci_dev *dev, unsigned int howmany, int rom)
{
unsigned int pos, reg;
+ if (dev->non_compliant_bars)
+ return;
+
for (pos = 0; pos < howmany; pos++) {
struct resource *res = &dev->resource[pos];
reg = PCI_BASE_ADDRESS_0 + (pos << 2);