diff options
| author | Julien Brunel <brunel@diku.dk> | 2008-09-01 10:57:27 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2008-10-17 14:40:53 -0700 |
| commit | bedf0883cbe3015d21aec5ed47ddffb429f6cca7 (patch) | |
| tree | 5a31171dcfa203f33dde74d040b704bccfc0fceb | |
| parent | 58209018cfd6f1fa8d0139af7c39dbfe73de21fd (diff) | |
USB: drivers/usb/misc: Use an IS_ERR test rather than a NULL test
In case of error, the function backlight_device_register returns an
ERR pointer, but never returns a NULL pointer. So a NULL test that may
come after a call to this function should be strengthened by an IS_ERR
test.
The semantic match that finds this problem is as follows:
(http://www.emn.fr/x-info/coccinelle/)
// <smpl>
@match_bad_null_test@
expression x, E;
statement S1,S2;
@@
x = backlight_device_register(...)
... when != x = E
* if (x != NULL)
S1 else S2
// </smpl>
Signed-off-by: Julien Brunel <brunel@diku.dk>
Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | drivers/usb/misc/appledisplay.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/usb/misc/appledisplay.c b/drivers/usb/misc/appledisplay.c index a076c24a312a..71d672ea1229 100644 --- a/drivers/usb/misc/appledisplay.c +++ b/drivers/usb/misc/appledisplay.c @@ -314,7 +314,7 @@ error: pdata->urbdata, pdata->urb->transfer_dma); usb_free_urb(pdata->urb); } - if (pdata->bd) + if (pdata->bd && !IS_ERR(pdata->bd)) backlight_device_unregister(pdata->bd); kfree(pdata->msgdata); } |