i7core_edac: Avoid PCI refcount to reach zero on successive load/reload

That's a nasty bug that took me a lot of time to track, and whose
solution took just one line to solve. The best fragrances and the worse
poisons are shipped on the smalest bottles.

The drivers/pci/quick.c implements the pci_get_device function. The normal
behavior is that you call it, the function returns you a pdev pointer
and increment pdev->kobj.kref.refcount of the pci device. However,
if you want to keep searching an object, you need to pass the previous
pdev function to the search.

When you use a not null pointer to pdev "from" field, pci_get_device
will decrement pdev->kobj.kref.refcount, assuming that the driver won't
be using the previous pdev.

The solution is simple: we just need to call pci_dev_get() manually,
for the pdev's that the driver will actually use.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --git a/drivers/edac/i7core_edac.c b/drivers/edac/i7core_edac.c
index 9868796..71f4dc6 100644 (file)
--- a/drivers/edac/i7core_edac.c
+++ b/drivers/edac/i7core_edac.c
@@ -1395,6 +1395,13 @@ static int i7core_get_onedevice(struct pci_dev **prev,
                dev_descr->func,
                PCI_VENDOR_ID_INTEL, dev_descr->dev_id);
 
+       /*
+        * As stated on drivers/pci/search.c, the reference count for
+        * @from is always decremented if it is not %NULL. So, as we need
+        * to get all devices up to null, we need to do a get for the device
+        */
+       pci_dev_get(pdev);
+
        *prev = pdev;
 
        return 0;