From: Julia Lawall <julia@diku.dk>

pci_get_class implicitly does a pci_dev_put on its second argument, so
pci_dev_put is only needed if there is a break out of the loop.

The semantic match detecting this problem is as follows:

// <smpl>
@@
expression dev;
expression E;
@@

* pci_dev_put(dev)
  ... when != dev = E
(
* pci_get_device(...,dev)
|
* pci_get_device_reverse(...,dev)
|
* pci_get_subsys(...,dev)
|
* pci_get_class(...,dev)
)
// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
Cc: Thomas Winischhofer <thomas@winischhofer.net>
Cc: "Antonino A. Daplas" <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 drivers/video/sis/sis_main.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff -puN drivers/video/sis/sis_main.c~drivers-video-remove-unnecessary-pci_dev_put drivers/video/sis/sis_main.c
--- a/drivers/video/sis/sis_main.c~drivers-video-remove-unnecessary-pci_dev_put
+++ a/drivers/video/sis/sis_main.c
@@ -4621,9 +4621,9 @@ sisfb_find_host_bridge(struct sis_video_
 
 	while((pdev = pci_get_class(PCI_CLASS_BRIDGE_HOST, pdev))) {
 		temp = pdev->vendor;
-		pci_dev_put(pdev);
 		if(temp == pcivendor) {
 			ret = 1;
+			pci_dev_put(pdev);
 			break;
 		}
 	}
_