From: Julia Lawall <julia@diku.dk>
To: rubini@vision.unipv.it, linux-kernel@vger.kernel.org,
kernel-janitors@vger.kernel.org
Subject: [PATCH 5/5] drivers/misc: elide a non-zero test on a result that is never 0
Date: Mon, 24 Mar 2008 19:10:51 +0100 (CET) [thread overview]
Message-ID: <Pine.LNX.4.64.0803241910080.32740@ask.diku.dk> (raw)
From: Julia Lawall <julia@diku.dk>
The function thermal_cooling_device_register always returns either a valid
pointer or a value made with ERR_PTR, so a test for non-zero on the result
will always succeed.
The problem was found using the following semantic match.
(http://www.emn.fr/x-info/coccinelle/)
//<smpl>
@a@
expression E, E1;
statement S,S1;
position p;
@@
E = thermal_cooling_device_register(...)
... when != E = E1
if@p (E) S else S1
@n@
position a.p;
expression E,E1;
statement S,S1;
@@
E = NULL
... when != E = E1
if@p (E) S else S1
@depends on !n@
expression E;
statement S,S1;
position a.p;
@@
* if@p (E)
S else S1
//</smpl>
Signed-off-by: Julia Lawall <julia@diku.dk>
---
drivers/misc/intel_menlow.c | 24 +++++++++++-------------
1 file changed, 11 insertions(+), 13 deletions(-)
diff -u -p a/drivers/misc/intel_menlow.c b/drivers/misc/intel_menlow.c
--- a/drivers/misc/intel_menlow.c 2008-03-12 14:13:13.000000000 +0100
+++ b/drivers/misc/intel_menlow.c 2008-03-24 16:18:06.000000000 +0100
@@ -175,19 +175,17 @@ static int intel_menlow_memory_add(struc
goto end;
}
- if (cdev) {
- acpi_driver_data(device) = cdev;
- result = sysfs_create_link(&device->dev.kobj,
- &cdev->device.kobj, "thermal_cooling");
- if (result)
- goto unregister;
-
- result = sysfs_create_link(&cdev->device.kobj,
- &device->dev.kobj, "device");
- if (result) {
- sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
- goto unregister;
- }
+ acpi_driver_data(device) = cdev;
+ result = sysfs_create_link(&device->dev.kobj,
+ &cdev->device.kobj, "thermal_cooling");
+ if (result)
+ goto unregister;
+
+ result = sysfs_create_link(&cdev->device.kobj,
+ &device->dev.kobj, "device");
+ if (result) {
+ sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
+ goto unregister;
}
end:
reply other threads:[~2008-03-24 18:11 UTC|newest]
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