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| author | Julia Lawall <julia@diku.dk> | 2008-03-27 01:48:22 -0400 |
|---|---|---|
| committer | Len Brown <len.brown@intel.com> | 2008-03-27 01:48:22 -0400 |
| commit | 1192aeb957402b45f311895f124e4ca41206843c (patch) | |
| tree | 877e5ac536ba87cdfe441c95c49e04f7bc8c63a4 /drivers/acpi/fan.c | |
| parent | 86d9fc1293aa9456677eab94e9fd2d3a10920548 (diff) | |
| download | linux-1192aeb957402b45f311895f124e4ca41206843c.tar.gz | |
ACPI: drivers/acpi: elide a non-zero test on a result that is never 0
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> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'drivers/acpi/fan.c')
| -rw-r--r-- | drivers/acpi/fan.c | 34 |
1 files changed, 16 insertions, 18 deletions
diff --git a/drivers/acpi/fan.c b/drivers/acpi/fan.c index c8e3cba423ef..4d535c50d821 100644 --- a/drivers/acpi/fan.c +++ b/drivers/acpi/fan.c @@ -260,24 +260,22 @@ static int acpi_fan_add(struct acpi_device *device) result = PTR_ERR(cdev); goto end; } - if (cdev) { - printk(KERN_INFO PREFIX - "%s is registered as cooling_device%d\n", - device->dev.bus_id, cdev->id); - - acpi_driver_data(device) = cdev; - result = sysfs_create_link(&device->dev.kobj, - &cdev->device.kobj, - "thermal_cooling"); - if (result) - return result; - - result = sysfs_create_link(&cdev->device.kobj, - &device->dev.kobj, - "device"); - if (result) - return result; - } + printk(KERN_INFO PREFIX + "%s is registered as cooling_device%d\n", + device->dev.bus_id, cdev->id); + + acpi_driver_data(device) = cdev; + result = sysfs_create_link(&device->dev.kobj, + &cdev->device.kobj, + "thermal_cooling"); + if (result) + return result; + + result = sysfs_create_link(&cdev->device.kobj, + &device->dev.kobj, + "device"); + if (result) + return result; result = acpi_fan_add_fs(device); if (result) |