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| author | Oliver Neukum <oneukum@suse.de> | 2007-01-16 17:49:21 +0100 |
|---|---|---|
| committer | Jaroslav Kysela <perex@suse.cz> | 2007-02-09 09:03:04 +0100 |
| commit | 5c33dd70b51be0617a75562aa896d5ccf1840455 (patch) | |
| tree | 9893efa106b79650d1c2c73dc12729e125cc5cc5 /sound/core | |
| parent | ad4d1dea62b6981a8c12df529e955424141d4b7a (diff) | |
| download | lwn-5c33dd70b51be0617a75562aa896d5ccf1840455.tar.gz lwn-5c33dd70b51be0617a75562aa896d5ccf1840455.zip | |
[ALSA] cleanup and error reporting for sound/core/init.c
Make the control flow clear with indentation, adds some comments
and improves error reporting.
Signed-off-by: Oliver Neukum <oneukum@suse.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>
Diffstat (limited to 'sound/core')
| -rw-r--r-- | sound/core/init.c | 22 |
1 files changed, 14 insertions, 8 deletions
diff --git a/sound/core/init.c b/sound/core/init.c index a4cc6b155ae9..db6103733742 100644 --- a/sound/core/init.c +++ b/sound/core/init.c @@ -114,22 +114,28 @@ struct snd_card *snd_card_new(int idx, const char *xid, 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) { idx = idx2; if (idx >= snd_ecards_limit) snd_ecards_limit = idx + 1; break; } - } else if (idx < snd_ecards_limit) { - if (snd_cards_lock & (1 << idx)) - err = -ENODEV; /* invalid */ - } else if (idx < SNDRV_CARDS) - snd_ecards_limit = idx + 1; /* increase the limit */ - else - err = -ENODEV; + } 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) { mutex_unlock(&snd_card_mutex); - snd_printk(KERN_ERR "cannot find the slot for index %d (range 0-%i)\n", idx, snd_ecards_limit - 1); + 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 */ |