PCI: Add informational printk for invalid BARs

As a consequence of restoring the detection of invalid BARs, add a new
informational printk like the following when such occurrences are
encountered.

  pci ssss:bb:dd.f: [Firmware Bug]: reg 0xXX: invalid BAR (can't size)

Reported-by: William Unruh <unruh@physics.ubc.ca>
Reported-by: Martin Lucina <martin@lucina.net>
Signed-off-by: Myron Stowe <myron.stowe@redhat.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
CC: Matthew Wilcox <willy@linux.intel.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 529fcd782e43..6029ad786146 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -247,8 +247,11 @@ int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type,
                 goto fail;
 
         sz64 = pci_size(l64, sz64, mask64);
-        if (!sz64)
+        if (!sz64) {
+                dev_info(&dev->dev, FW_BUG "reg 0x%x: invalid BAR (can't size)\n",
+                         pos);
                 goto fail;
+        }
 
         if (res->flags & IORESOURCE_MEM_64) {
                 if ((sizeof(dma_addr_t) < 8 || sizeof(resource_size_t) < 8) &&