linux-kernel - [PATCH 2/2]: drivers/video: remove unnecessary pci_dev

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Message-ID: <Pine.LNX.4.58.0711151140100.1184@pc-041.diku.dk>
Date:	Thu, 15 Nov 2007 11:40:49 +0100 (MET)
From:	Julia Lawall <julia@...u.dk>
To:	thomas@...ischhofer.net, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: [PATCH 2/2]: drivers/video: remove unnecessary pci_dev_put

From: Julia Lawall <julia@...u.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@...u.dk>
---

diff -up a/drivers/video/sis/sis_main.c b/drivers/video/sis/sis_main.c
--- a/drivers/video/sis/sis_main.c	2007-11-15 07:33:31.000000000 +0100
+++ b/drivers/video/sis/sis_main.c	2007-11-15 07:38:48.000000000 +0100
@@ -4620,9 +4620,9 @@ 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;
 		}
 	}
-
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