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List: kernel-janitors
Subject: [PATCH] drivers/usb/misc: Use an IS_ERR test rather than a NULL test
From: Julien Brunel <brunel () diku ! dk>
Date: 2008-09-01 8:57:27
Message-ID: 200809011057.28293.brunel () diku ! dk
[Download RAW message or body]
From: Julien Brunel <brunel@diku.dk>
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>
---
drivers/usb/misc/appledisplay.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff -u -p a/drivers/usb/misc/appledisplay.c b/drivers/usb/misc/appledisplay.c
--- 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);
}
--
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