[ALSA] dynamic minors (3/6): store device-specific object pointers dynamically

Instead of storing the pointers to the device-specific structures in an
array, put them into the struct snd_minor, and look them up dynamically.

This makes the device type modules independent of the minor number
encoding.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>

1 files changed, 4 insertions, 3 deletions

diff --git a/sound/core/oss/mixer_oss.c b/sound/core/oss/mixer_oss.c
index 2dd6bf9b49e..2d7a42014f5 100644
--- a/sound/core/oss/mixer_oss.c
+++ b/sound/core/oss/mixer_oss.c
@@ -41,12 +41,13 @@ MODULE_ALIAS_SNDRV_MINOR(SNDRV_MINOR_OSS_MIXER);
 
 static int snd_mixer_oss_open(struct inode *inode, struct file *file)
 {
-        int cardnum = SNDRV_MINOR_OSS_CARD(iminor(inode));
         struct snd_card *card;
         struct snd_mixer_oss_file *fmixer;
         int err;
 
-        if ((card = snd_cards[cardnum]) == NULL)
+        card = snd_lookup_oss_minor_data(iminor(inode),
+                                         SNDRV_OSS_DEVICE_TYPE_MIXER);
+        if (card == NULL)
                 return -ENODEV;
         if (card->mixer_oss == NULL)
                 return -ENODEV;
@@ -1286,7 +1287,7 @@ static int snd_mixer_oss_notify_handler(struct snd_card *card, int cmd)
                 sprintf(name, "mixer%i%i", card->number, 0);
                 if ((err = snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIXER,
                                                    card, 0,
-                                                   &snd_mixer_oss_f_ops,
+                                                   &snd_mixer_oss_f_ops, card,
                                                    name)) < 0) {
                         snd_printk(KERN_ERR "unable to register OSS mixer device %i:%i\n",
                                    card->number, 0);