PCI: output FW warning in pci_read/write_vpd

pci_read/write_vpd() can fail due to a timeout.  Usually the command
times out because of firmware issues (incorrect vpd length, etc.) on the
PCI card.  Currently, the timeout occurs silently.

Output a message to the user indicating that they should check with
their vendor for new firmware.

Reviewed-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Prarit Bhargava <prarit@redhat.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

1 files changed, 6 insertions, 1 deletions

diff --git a/drivers/pci/access.c b/drivers/pci/access.c
index affb83b42ebb..531bc697d800 100644
--- a/drivers/pci/access.c
+++ b/drivers/pci/access.c
@@ -220,8 +220,13 @@ static int pci_vpd_pci22_wait(struct pci_dev *dev)
                         return 0;
                 }
 
-                if (time_after(jiffies, timeout))
+                if (time_after(jiffies, timeout)) {
+                        dev_printk(KERN_DEBUG, &dev->dev,
+                                   "vpd r/w failed.  This is likely a firmware "
+                                   "bug on this device.  Contact the card "
+                                   "vendor for a firmware update.");
                         return -ETIMEDOUT;
+                }
                 if (fatal_signal_pending(current))
                         return -EINTR;
                 if (!cond_resched())