From f87135f56cb266e031f5ec081dfbde7e43f55e80 Mon Sep 17 00:00:00 2001 From: Clemens Ladisch Date: Sun, 20 Nov 2005 14:06:59 +0100 Subject: [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 --- sound/core/rawmidi.c | 87 ++++++++++++++++++++++++++-------------------------- 1 file changed, 44 insertions(+), 43 deletions(-) (limited to 'sound/core/rawmidi.c') diff --git a/sound/core/rawmidi.c b/sound/core/rawmidi.c index 7ac77e5..e6ee0d8 100644 --- a/sound/core/rawmidi.c +++ b/sound/core/rawmidi.c @@ -56,10 +56,22 @@ static int snd_rawmidi_dev_register(struct snd_device *device); static int snd_rawmidi_dev_disconnect(struct snd_device *device); static int snd_rawmidi_dev_unregister(struct snd_device *device); -static struct snd_rawmidi *snd_rawmidi_devices[SNDRV_CARDS * SNDRV_RAWMIDI_DEVICES]; - +static LIST_HEAD(snd_rawmidi_devices); static DECLARE_MUTEX(register_mutex); +static struct snd_rawmidi *snd_rawmidi_search(struct snd_card *card, int device) +{ + struct list_head *p; + struct snd_rawmidi *rawmidi; + + list_for_each(p, &snd_rawmidi_devices) { + rawmidi = list_entry(p, struct snd_rawmidi, list); + if (rawmidi->card == card && rawmidi->device == device) + return rawmidi; + } + return NULL; +} + static inline unsigned short snd_rawmidi_file_flags(struct file *file) { switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) { @@ -214,7 +226,7 @@ int snd_rawmidi_drain_input(struct snd_rawmidi_substream *substream) return 0; } -int snd_rawmidi_kernel_open(int cardnum, int device, int subdevice, +int snd_rawmidi_kernel_open(struct snd_card *card, int device, int subdevice, int mode, struct snd_rawmidi_file * rfile) { struct snd_rawmidi *rmidi; @@ -225,7 +237,9 @@ int snd_rawmidi_kernel_open(int cardnum, int device, int subdevice, if (rfile) rfile->input = rfile->output = NULL; - rmidi = snd_rawmidi_devices[(cardnum * SNDRV_RAWMIDI_DEVICES) + device]; + down(®ister_mutex); + rmidi = snd_rawmidi_search(card, device); + up(®ister_mutex); if (rmidi == NULL) { err = -ENODEV; goto __error1; @@ -368,9 +382,8 @@ int snd_rawmidi_kernel_open(int cardnum, int device, int subdevice, static int snd_rawmidi_open(struct inode *inode, struct file *file) { int maj = imajor(inode); - int cardnum; struct snd_card *card; - int device, subdevice; + int subdevice; unsigned short fflags; int err; struct snd_rawmidi *rmidi; @@ -380,27 +393,18 @@ static int snd_rawmidi_open(struct inode *inode, struct file *file) struct snd_ctl_file *kctl; if (maj == snd_major) { - cardnum = SNDRV_MINOR_CARD(iminor(inode)); - cardnum %= SNDRV_CARDS; - device = SNDRV_MINOR_DEVICE(iminor(inode)) - SNDRV_MINOR_RAWMIDI; - device %= SNDRV_MINOR_RAWMIDIS; + rmidi = snd_lookup_minor_data(iminor(inode), + SNDRV_DEVICE_TYPE_RAWMIDI); #ifdef CONFIG_SND_OSSEMUL } else if (maj == SOUND_MAJOR) { - cardnum = SNDRV_MINOR_OSS_CARD(iminor(inode)); - cardnum %= SNDRV_CARDS; - device = SNDRV_MINOR_OSS_DEVICE(iminor(inode)) == SNDRV_MINOR_OSS_MIDI ? - midi_map[cardnum] : amidi_map[cardnum]; + rmidi = snd_lookup_oss_minor_data(iminor(inode), + SNDRV_OSS_DEVICE_TYPE_MIDI); #endif } else return -ENXIO; - rmidi = snd_rawmidi_devices[(cardnum * SNDRV_RAWMIDI_DEVICES) + device]; if (rmidi == NULL) return -ENODEV; -#ifdef CONFIG_SND_OSSEMUL - if (maj == SOUND_MAJOR && !rmidi->ossreg) - return -ENXIO; -#endif if ((file->f_flags & O_APPEND) && !(file->f_flags & O_NONBLOCK)) return -EINVAL; /* invalid combination */ card = rmidi->card; @@ -430,7 +434,8 @@ static int snd_rawmidi_open(struct inode *inode, struct file *file) } } up_read(&card->controls_rwsem); - err = snd_rawmidi_kernel_open(cardnum, device, subdevice, fflags, rawmidi_file); + err = snd_rawmidi_kernel_open(rmidi->card, rmidi->device, + subdevice, fflags, rawmidi_file); if (err >= 0) break; if (err == -EAGAIN) { @@ -570,9 +575,10 @@ int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info struct snd_rawmidi_str *pstr; struct snd_rawmidi_substream *substream; struct list_head *list; - if (info->device >= SNDRV_RAWMIDI_DEVICES) - return -ENXIO; - rmidi = snd_rawmidi_devices[card->number * SNDRV_RAWMIDI_DEVICES + info->device]; + + down(®ister_mutex); + rmidi = snd_rawmidi_search(card, info->device); + up(®ister_mutex); if (!rmidi) return -ENXIO; if (info->stream < 0 || info->stream > 1) @@ -803,9 +809,7 @@ static int snd_rawmidi_control_ioctl(struct snd_card *card, unsigned long arg) { void __user *argp = (void __user *)arg; - unsigned int tmp; - tmp = card->number * SNDRV_RAWMIDI_DEVICES; switch (cmd) { case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE: { @@ -813,14 +817,16 @@ static int snd_rawmidi_control_ioctl(struct snd_card *card, if (get_user(device, (int __user *)argp)) return -EFAULT; + down(®ister_mutex); device = device < 0 ? 0 : device + 1; while (device < SNDRV_RAWMIDI_DEVICES) { - if (snd_rawmidi_devices[tmp + device]) + if (snd_rawmidi_search(card, device)) break; device++; } if (device == SNDRV_RAWMIDI_DEVICES) device = -1; + up(®ister_mutex); if (put_user(device, (int __user *)argp)) return -EFAULT; return 0; @@ -1493,7 +1499,7 @@ static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device) static int snd_rawmidi_dev_register(struct snd_device *device) { - int idx, err; + int err; struct snd_info_entry *entry; char name[16]; struct snd_rawmidi *rmidi = device->device_data; @@ -1501,25 +1507,24 @@ static int snd_rawmidi_dev_register(struct snd_device *device) if (rmidi->device >= SNDRV_RAWMIDI_DEVICES) return -ENOMEM; down(®ister_mutex); - idx = (rmidi->card->number * SNDRV_RAWMIDI_DEVICES) + rmidi->device; - if (snd_rawmidi_devices[idx] != NULL) { + if (snd_rawmidi_search(rmidi->card, rmidi->device)) { up(®ister_mutex); return -EBUSY; } - snd_rawmidi_devices[idx] = rmidi; + list_add_tail(&rmidi->list, &snd_rawmidi_devices); sprintf(name, "midiC%iD%i", rmidi->card->number, rmidi->device); if ((err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI, rmidi->card, rmidi->device, - &snd_rawmidi_f_ops, name)) < 0) { + &snd_rawmidi_f_ops, rmidi, name)) < 0) { snd_printk(KERN_ERR "unable to register rawmidi device %i:%i\n", rmidi->card->number, rmidi->device); - snd_rawmidi_devices[idx] = NULL; + list_del(&rmidi->list); up(®ister_mutex); return err; } if (rmidi->ops && rmidi->ops->dev_register && (err = rmidi->ops->dev_register(rmidi)) < 0) { snd_unregister_device(SNDRV_DEVICE_TYPE_RAWMIDI, rmidi->card, rmidi->device); - snd_rawmidi_devices[idx] = NULL; + list_del(&rmidi->list); up(®ister_mutex); return err; } @@ -1527,8 +1532,8 @@ static int snd_rawmidi_dev_register(struct snd_device *device) rmidi->ossreg = 0; if ((int)rmidi->device == midi_map[rmidi->card->number]) { if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, - rmidi->card, 0, - &snd_rawmidi_f_ops, name) < 0) { + rmidi->card, 0, &snd_rawmidi_f_ops, + rmidi, name) < 0) { snd_printk(KERN_ERR "unable to register OSS rawmidi device %i:%i\n", rmidi->card->number, 0); } else { rmidi->ossreg++; @@ -1539,8 +1544,8 @@ static int snd_rawmidi_dev_register(struct snd_device *device) } if ((int)rmidi->device == amidi_map[rmidi->card->number]) { if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, - rmidi->card, 1, - &snd_rawmidi_f_ops, name) < 0) { + rmidi->card, 1, &snd_rawmidi_f_ops, + rmidi, name) < 0) { snd_printk(KERN_ERR "unable to register OSS rawmidi device %i:%i\n", rmidi->card->number, 1); } else { rmidi->ossreg++; @@ -1576,24 +1581,20 @@ static int snd_rawmidi_dev_register(struct snd_device *device) static int snd_rawmidi_dev_disconnect(struct snd_device *device) { struct snd_rawmidi *rmidi = device->device_data; - int idx; down(®ister_mutex); - idx = (rmidi->card->number * SNDRV_RAWMIDI_DEVICES) + rmidi->device; - snd_rawmidi_devices[idx] = NULL; + list_del_init(&rmidi->list); up(®ister_mutex); return 0; } static int snd_rawmidi_dev_unregister(struct snd_device *device) { - int idx; struct snd_rawmidi *rmidi = device->device_data; snd_assert(rmidi != NULL, return -ENXIO); down(®ister_mutex); - idx = (rmidi->card->number * SNDRV_RAWMIDI_DEVICES) + rmidi->device; - snd_rawmidi_devices[idx] = NULL; + list_del(&rmidi->list); if (rmidi->proc_entry) { snd_info_unregister(rmidi->proc_entry); rmidi->proc_entry = NULL; -- cgit v1.1