PCI: Catch attempts to disable already-disabled devices
Warn when disabling a device that has already been disabled.
[bhelgaas: message wording]
Signed-off-by: Konstantin Khlebnikov <khlebnikov@openvz.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 5cb5820..29a09b7 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -1401,6 +1401,9 @@
if (dr)
dr->enabled = 0;
+ dev_WARN_ONCE(&dev->dev, atomic_read(&dev->enable_cnt) <= 0,
+ "disabling already-disabled device");
+
if (atomic_sub_return(1, &dev->enable_cnt) != 0)
return;