PCI: Disable all BAR sizing for devices with non-compliant BARs

commit ad67b437f187ea818b2860524d10f878fadfdd99 upstream.

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: 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>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index fbf3be1..4a640a8 100644 (file)
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -136,9 +136,6 @@ int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type,
        u32 l, sz, mask;
        u16 orig_cmd;
 
-       if (dev->non_compliant_bars)
-               return 0;
-
        mask = type ? PCI_ROM_ADDRESS_MASK : ~0;
 
        if (!dev->mmio_always_on) {
@@ -251,6 +248,9 @@ 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);