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ALSA: jack: Fix endless loop at unique index detection 

While the commit [d0a601c278de: ALSA: jack: Fix the id uniqueness
check] fixes the wrong string check, it leads to a worse result -- the
loop in get_available_index() goes into an endless loop.  The cause is
that snd_ctl_find_id() returns the object assigned to the numid if
it's set.  Thus it points to the previous entry again.

This patch clears the numid field for the next call properly.

Reported-and-tested-by: Tomáš Pružina <pruzinat@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2015-06-26 06:59:57 +02:00
parent 650474fb73
commit 7378bc2f19
1 changed files with 4 additions and 1 deletions
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5
sound/core/ctljack.c
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@ -41,8 +41,11 @@ static int get_available_index(struct snd_card *card, const char *name)
sid.iface = SNDRV_CTL_ELEM_IFACE_CARD;
strlcpy(sid.name, name, sizeof(sid.name));
while (snd_ctl_find_id(card, &sid))
while (snd_ctl_find_id(card, &sid)) {
sid.index++;
/* reset numid; otherwise snd_ctl_find_id() hits this again */
sid.numid = 0;
}
return sid.index;
}