[PATCH 3/3] PCI: Add a informational printk for invalid BARs

[Myron Stowe]

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@xxxxxxxxxxxxxx>
Reported-by: Martin Lucina <martin@xxxxxxxxxx>
Signed-off-by: Myron Stowe <myron.stowe@xxxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxxxx>
---
 drivers/pci/probe.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 5c13279..2953c1d 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -271,8 +271,11 @@ int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type,
 
 	sz64 = pci_size(l64, sz64, mask64);
 
-	if (!sz64)
+	if (!sz64) {
+		dev_info(&dev->dev, "%sreg 0x%x: invalid BAR (can't size)\n",
+			 FW_BUG, pos);
 		goto fail;
+	}
 
 	region.start = l64;
 	region.end = l64 + sz64;

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