ALSA: us122l: add snd_us122l_free()

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>

1 files changed, 10 insertions, 2 deletions

diff --git a/sound/usb/usx2y/us122l.c b/sound/usb/usx2y/us122l.c
index 98276aafefe..463f3ffe3fb 100644
--- 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 int usx2y_create_card(struct usb_device *device, struct snd_card **cardp)
 {
         int             dev;
@@ -494,7 +502,7 @@ static int usx2y_create_card(struct usb_device *device, struct snd_card **cardp)
         if (err < 0)
                 return err;
         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);
@@ -588,7 +596,7 @@ 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);