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>

1 files changed, 3 insertions, 1 deletions

diff --git a/sound/pci/pcxhr/pcxhr.c b/sound/pci/pcxhr/pcxhr.c
index 0e06c6c9fcc0..58621206a2b3 100644
--- a/sound/pci/pcxhr/pcxhr.c
+++ b/sound/pci/pcxhr/pcxhr.c
@@ -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;
                 }