diff mbox

[5/5] PCI: catch enable-counter underflows

Message ID 20130118114230.6698.1881.stgit@zurg (mailing list archive)
State New, archived
Delegated to: Bjorn Helgaas
Headers show

Commit Message

Konstantin Khlebnikov Jan. 18, 2013, 11:42 a.m. UTC 
This patch adds single WARN_ONCE() check for catching 'enable_cnt' imbalances.

Signed-off-by: Konstantin Khlebnikov <khlebnikov@openvz.org>
Cc: linux-pci@vger.kernel.org
Cc: Bjorn Helgaas <bhelgaas@google.com>
---
 drivers/pci/pci.c |    3 +++
 1 file changed, 3 insertions(+)


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diff mbox

Patch

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 5cb5820..ff93f8f 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -1401,6 +1401,9 @@  pci_disable_device(struct pci_dev *dev)
 	if (dr)
 		dr->enabled = 0;
 
+	dev_WARN_ONCE(&dev->dev, atomic_read(&dev->enable_cnt) <= 0,
+			"enable counter underflow");
+
 	if (atomic_sub_return(1, &dev->enable_cnt) != 0)
 		return;