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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>
This commit is contained in:
Julien Brunel 2008-09-01 10:57:27 +02:00 committed by Greg Kroah-Hartman
parent 58209018cf
commit bedf0883cb
1 changed files with 1 additions and 1 deletions
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2
drivers/usb/misc/appledisplay.c
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@ -314,7 +314,7 @@ error:
pdata->urbdata, pdata->urb->transfer_dma); pdata->urbdata, pdata->urb->transfer_dma);
usb_free_urb(pdata->urb); usb_free_urb(pdata->urb);
} }
if (pdata->bd) if (pdata->bd && !IS_ERR(pdata->bd))
backlight_device_unregister(pdata->bd); backlight_device_unregister(pdata->bd);
kfree(pdata->msgdata); kfree(pdata->msgdata);
} }