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| author | Julia Lawall <julia@diku.dk> | 2009-10-17 08:33:22 +0200 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2009-10-30 12:01:27 +0100 |
| commit | 4b3be6afa4ab8b3fdce39df68bad71f8b85164de (patch) | |
| tree | 9022bd2b563fabc987e31277782076db42946bb7 /sound/core/pcm.c | |
| parent | b71207e9dc044b30d8b5d7f1c2290ba14563f05c (diff) | |
| download | lwn-4b3be6afa4ab8b3fdce39df68bad71f8b85164de.tar.gz lwn-4b3be6afa4ab8b3fdce39df68bad71f8b85164de.zip | |
ALSA: sound: Move dereference after NULL test and drop unnecessary NULL tests
In pcm.c, if the NULL test on pcm is needed, then the dereference should be
after the NULL test.
In dummy.c and ali5451.c, the context of the calls to
snd_card_dummy_new_mixer and snd_ali_free_voice show that dummy and pvoice,
respectively cannot be NULL.
A simplified version of the semantic match that detects this problem is as
follows (http://coccinelle.lip6.fr/):
// <smpl>
@match exists@
expression x, E;
identifier fld;
@@
* x->fld
... when != \(x = E\|&x\)
* x == NULL
// </smpl>
Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/core/pcm.c')
| -rw-r--r-- | sound/core/pcm.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/sound/core/pcm.c b/sound/core/pcm.c index 0c1440121c22..c69c60b2a48a 100644 --- a/sound/core/pcm.c +++ b/sound/core/pcm.c @@ -953,11 +953,12 @@ static int snd_pcm_dev_register(struct snd_device *device) struct snd_pcm_substream *substream; struct snd_pcm_notify *notify; char str[16]; - struct snd_pcm *pcm = device->device_data; + struct snd_pcm *pcm; struct device *dev; - if (snd_BUG_ON(!pcm || !device)) + if (snd_BUG_ON(!device || !device->device_data)) return -ENXIO; + pcm = device->device_data; mutex_lock(®ister_mutex); err = snd_pcm_add(pcm); if (err) { |