diff options
| -rw-r--r-- | Documentation/sound/alsa/ALSA-Configuration.txt | 4 | ||||
| -rw-r--r-- | sound/core/init.c | 67 |
2 files changed, 44 insertions, 27 deletions
diff --git a/Documentation/sound/alsa/ALSA-Configuration.txt b/Documentation/sound/alsa/ALSA-Configuration.txt index f48939e97ab..529073dea19 100644 --- a/Documentation/sound/alsa/ALSA-Configuration.txt +++ b/Documentation/sound/alsa/ALSA-Configuration.txt @@ -2271,6 +2271,10 @@ case above again, the first two slots are already reserved. If any other driver (e.g. snd-usb-audio) is loaded before snd-interwave or snd-ens1371, it will be assigned to the third or later slot. +When a module name is given with '!', the slot will be given for any +modules but that name. For example, "slots=!snd-pcsp" will reserve +the first slot for any modules but snd-pcsp. + ALSA PCM devices to OSS devices mapping ======================================= diff --git a/sound/core/init.c b/sound/core/init.c index ac057341613..5c254d498ae 100644 --- a/sound/core/init.c +++ b/sound/core/init.c @@ -46,17 +46,24 @@ static char *slots[SNDRV_CARDS]; module_param_array(slots, charp, NULL, 0444); MODULE_PARM_DESC(slots, "Module names assigned to the slots."); -/* return non-zero if the given index is already reserved for another +/* return non-zero if the given index is reserved for the given * module via slots option */ -static int module_slot_mismatch(struct module *module, int idx) +static int module_slot_match(struct module *module, int idx) { + int match = 1; #ifdef MODULE - char *s1, *s2; + const char *s1, *s2; + if (!module || !module->name || !slots[idx]) return 0; - s1 = slots[idx]; - s2 = module->name; + + s1 = module->name; + s2 = slots[idx]; + if (*s2 == '!') { + match = 0; /* negative match */ + s2++; + } /* compare module name strings * hyphens are handled as equivalent with underscore */ @@ -68,12 +75,12 @@ static int module_slot_mismatch(struct module *module, int idx) if (c2 == '-') c2 = '_'; if (c1 != c2) - return 1; + return !match; if (!c1) break; } -#endif - return 0; +#endif /* MODULE */ + return match; } #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) @@ -129,7 +136,7 @@ struct snd_card *snd_card_new(int idx, const char *xid, struct module *module, int extra_size) { struct snd_card *card; - int err; + int err, idx2; if (extra_size < 0) extra_size = 0; @@ -144,35 +151,41 @@ struct snd_card *snd_card_new(int idx, const char *xid, err = 0; mutex_lock(&snd_card_mutex); if (idx < 0) { - int idx2; for (idx2 = 0; idx2 < SNDRV_CARDS; idx2++) /* idx == -1 == 0xffff means: take any free slot */ if (~snd_cards_lock & idx & 1<<idx2) { - if (module_slot_mismatch(module, idx2)) - continue; - idx = idx2; - if (idx >= snd_ecards_limit) - snd_ecards_limit = idx + 1; - break; + if (module_slot_match(module, idx2)) { + idx = idx2; + break; + } + } + } + if (idx < 0) { + for (idx2 = 0; idx2 < SNDRV_CARDS; idx2++) + /* idx == -1 == 0xffff means: take any free slot */ + if (~snd_cards_lock & idx & 1<<idx2) { + if (!slots[idx2] || !*slots[idx2]) { + idx = idx2; + break; + } } - } else { - if (idx < snd_ecards_limit) { - if (snd_cards_lock & (1 << idx)) - err = -EBUSY; /* invalid */ - } else { - if (idx < SNDRV_CARDS) - snd_ecards_limit = idx + 1; /* increase the limit */ - else - err = -ENODEV; - } } - if (idx < 0 || err < 0) { + if (idx < 0) + err = -ENODEV; + else if (idx < snd_ecards_limit) { + if (snd_cards_lock & (1 << idx)) + err = -EBUSY; /* invalid */ + } else if (idx >= SNDRV_CARDS) + err = -ENODEV; + if (err < 0) { mutex_unlock(&snd_card_mutex); snd_printk(KERN_ERR "cannot find the slot for index %d (range 0-%i), error: %d\n", idx, snd_ecards_limit - 1, err); goto __error; } snd_cards_lock |= 1 << idx; /* lock it */ + if (idx >= snd_ecards_limit) + snd_ecards_limit = idx + 1; /* increase the limit */ mutex_unlock(&snd_card_mutex); card->number = idx; card->module = module; |