ALSA: us122l: add snd_us122l_free()

upstream commit: 5d4af1be06affa2b42cdf59cd376752be1f934b3

Use it to clean up snd_us122l_card_used[].

Without patch unplugging of an US122L soundcard didn't reset the
corresponding element of snd_us122l_card_used[] to 0.
The (SNDRV_CARDS + 1)th plugging in did not result in creating the soundcard
device anymore.
Index values supplied with the modprobe command line were not used correctly
anymore after the first unplugging of an US122L.

Signed-off-by: Karsten Wiese <fzu@wemgehoertderstaat.de>
Cc: stable@kernel.org
Signed-off-by: Takashi Iwai <tiwai@suse.de>
[chrisw: backport to 2.6.29]
Signed-off-by: Chris Wright <chrisw@sous-sol.org>

diff --git a/sound/usb/usx2y/us122l.c b/sound/usb/usx2y/us122l.c
index 73e59f4403a483b16a041a9bba9f767e6b021c60..9ce1c597ed62fcb946f5a7438f76113c899131ae 100644 (file)
--- a/sound/usb/usx2y/us122l.c
+++ b/sound/usb/usx2y/us122l.c
@@ -478,6 +478,14 @@ static bool us122l_create_card(struct snd_card *card)
        return true;
 }
 
+static void snd_us122l_free(struct snd_card *card)
+{
+       struct us122l   *us122l = US122L(card);
+       int             index = us122l->chip.index;
+       if (index >= 0  &&  index < SNDRV_CARDS)
+               snd_us122l_card_used[index] = 0;
+}
+
 static struct snd_card *usx2y_create_card(struct usb_device *device)
 {
        int             dev;
@@ -492,7 +500,7 @@ static struct snd_card *usx2y_create_card(struct usb_device *device)
        if (!card)
                return NULL;
        snd_us122l_card_used[US122L(card)->chip.index = dev] = 1;
-
+       card->private_free = snd_us122l_free;
        US122L(card)->chip.dev = device;
        US122L(card)->chip.card = card;
        mutex_init(&US122L(card)->mutex);
@@ -575,7 +583,7 @@ static void snd_us122l_disconnect(struct usb_interface *intf)
        }
 
        usb_put_intf(intf);
-       usb_put_dev(US122L(card)->chip.dev);
+       usb_put_dev(us122l->chip.dev);
 
        while (atomic_read(&us122l->mmap_count))
                msleep(500);