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ALSA: sound/pci/mixart/mixart.c: Add missing snd_card_free 

The function snd_mixart_create creates a link between mgr and card that
allows snd_mixart_free to free card as well.  But if snd_mixart_create
fails, then the link has not been created and card has to be freed explicitly.

The semantic match that finds the problem is as follows:
(http://www.emn.fr/x-info/coccinelle/)

// <smpl>
@r exists@
local idexpression x;
statement S,S1;
position p1,p2,p3;
expression E,E1;
type T,T1;
expression *ptr != NULL;
@@

(
 if ((x@p1 = snd_card_new(...)) == NULL) S
|
 x@p1 = snd_card_new(...);
)
 ... when != snd_card_free(...,(T)x,...)
     when != if (...) { <+... snd_card_free(...,(T)x,...) ...+> }
     when != true x == NULL || ...
     when != x = E
     when != E = (T)x
     when any
(
 if (x == NULL || ...) S1
|
 if@p2 (...) {
  ... when != snd_card_free(...,(T1)x,...)
      when != if (...) { <+... snd_card_free(...,(T1)x,...) ...+> }
      when != x = E1
      when != E1 = (T1)x
(
  return \(0\|<+...x...+>\|ptr\);
|
  return@p3 ...;
)
}
)

@ script:python @
p1 << r.p1;
p3 << r.p3;
@@

print "* file: %s snd_card_new: %s return: %s" % (p1[0].file,p1[0].line,p3[0].line)

// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Julia Lawall 2008-11-27 15:40:40 +01:00 committed by Takashi Iwai
parent 12666f050b
commit 73f6a12ed1
2 changed files with 6 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
sound/pci/mixart/mixart.c
View File

@ -1010,7 +1010,7 @@ static int __devinit snd_mixart_create(struct mixart_mgr *mgr, struct snd_card *
.dev_free = snd_mixart_chip_dev_free,
};
mgr->chip[idx] = chip = kzalloc(sizeof(*chip), GFP_KERNEL);
chip = kzalloc(sizeof(*chip), GFP_KERNEL);
if (! chip) {
snd_printk(KERN_ERR "cannot allocate chip\n");
return -ENOMEM;
@ -1025,6 +1025,7 @@ static int __devinit snd_mixart_create(struct mixart_mgr *mgr, struct snd_card *
return err;
}
mgr->chip[idx] = chip;
snd_card_set_dev(card, &mgr->pci->dev);
return 0;
@ -1378,6 +1379,7 @@ static int __devinit snd_mixart_probe(struct pci_dev *pci,
sprintf(card->longname, "%s [PCM #%d]", mgr->longname, i);
if ((err = snd_mixart_create(mgr, card, i)) < 0) {
snd_card_free(card);
snd_mixart_free(mgr);
return err;
}

4
sound/pci/pcxhr/pcxhr.c
View File

@ -1024,7 +1024,7 @@ static int __devinit pcxhr_create(struct pcxhr_mgr *mgr, struct snd_card *card,
.dev_free = pcxhr_chip_dev_free,
};
mgr->chip[idx] = chip = kzalloc(sizeof(*chip), GFP_KERNEL);
chip = kzalloc(sizeof(*chip), GFP_KERNEL);
if (! chip) {
snd_printk(KERN_ERR "cannot allocate chip\n");
return -ENOMEM;
@ -1050,6 +1050,7 @@ static int __devinit pcxhr_create(struct pcxhr_mgr *mgr, struct snd_card *card,
return err;
}
mgr->chip[idx] = chip;
snd_card_set_dev(card, &mgr->pci->dev);
return 0;
@ -1307,6 +1308,7 @@ static int __devinit pcxhr_probe(struct pci_dev *pci, const struct pci_device_id
sprintf(card->longname, "%s [PCM #%d]", mgr->longname, i);
if ((err = pcxhr_create(mgr, card, i)) < 0) {
snd_card_free(card);
pcxhr_free(mgr);
return err;
}