linux-kernel - [PATCH 1/2]: drivers/char: remove unnecessary pci_dev

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Date:	Thu, 15 Nov 2007 11:40:08 +0100 (MET)
From:	Julia Lawall <julia@...u.dk>
To:	davej@...emonkey.org.uk, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: [PATCH 1/2]: drivers/char: 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/char/agp/amd-k7-agp.c b/drivers/char/agp/amd-k7-agp.c
--- a/drivers/char/agp/amd-k7-agp.c	2007-11-15 07:33:31.000000000 +0100
+++ b/drivers/char/agp/amd-k7-agp.c	2007-11-15 07:40:48.000000000 +0100
@@ -436,10 +436,6 @@ static int __devinit agp_amdk7_probe(str
 				return -ENODEV;
 			}
 			cap_ptr = pci_find_capability(gfxcard, PCI_CAP_ID_AGP);
-			if (!cap_ptr) {
-				pci_dev_put(gfxcard);
-				continue;
-			}
 		}

 		/* With so many variants of NVidia cards, it's simpler just
-
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