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authorJulia Lawall <julia@diku.dk>2008-03-27 01:48:22 -0400
committerLen Brown <len.brown@intel.com>2008-03-27 01:48:22 -0400
commit1192aeb957402b45f311895f124e4ca41206843c (patch)
tree877e5ac536ba87cdfe441c95c49e04f7bc8c63a4 /drivers/acpi/fan.c
parent86d9fc1293aa9456677eab94e9fd2d3a10920548 (diff)
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.c34
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)
260 result = PTR_ERR(cdev); 260 result = PTR_ERR(cdev);
261 goto end; 261 goto end;
262 } 262 }
263 if (cdev) { 263 printk(KERN_INFO PREFIX
264 printk(KERN_INFO PREFIX 264 "%s is registered as cooling_device%d\n",
265 "%s is registered as cooling_device%d\n", 265 device->dev.bus_id, cdev->id);
266 device->dev.bus_id, cdev->id); 266
267 267 acpi_driver_data(device) = cdev;
268 acpi_driver_data(device) = cdev; 268 result = sysfs_create_link(&device->dev.kobj,
269 result = sysfs_create_link(&device->dev.kobj, 269 &cdev->device.kobj,
270 &cdev->device.kobj, 270 "thermal_cooling");
271 "thermal_cooling"); 271 if (result)
272 if (result) 272 return result;
273 return result; 273
274 274 result = sysfs_create_link(&cdev->device.kobj,
275 result = sysfs_create_link(&cdev->device.kobj, 275 &device->dev.kobj,
276 &device->dev.kobj, 276 "device");
277 "device"); 277 if (result)
278 if (result) 278 return result;
279 return result;
280 }
281 279
282 result = acpi_fan_add_fs(device); 280 result = acpi_fan_add_fs(device);
283 if (result) 281 if (result)