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[ALSA] snd_hwdep_release() racefix

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snd_card_file_remove() can free the snd_card.
Touch hw->* only before calling snd_card_file_remove().
Unrelated: Allow hwdep devices not to have own ops.release();

Signed-off-by: Karsten Wiese <fzu@wemgehoertderstaat.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>
This commit is contained in:
Karsten Wiese 2007-01-31 10:05:30 +01:00 committed by Jaroslav Kysela
parent 298a2c753a
commit 8fa58af7db
1 changed files with 5 additions and 4 deletions
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9
sound/core/hwdep.c
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@ -156,15 +156,16 @@ static int snd_hwdep_release(struct inode *inode, struct file * file)
int err = -ENXIO;
struct snd_hwdep *hw = file->private_data;
struct module *mod = hw->card->module;
mutex_lock(&hw->open_mutex);
if (hw->ops.release) {
if (hw->ops.release)
err = hw->ops.release(hw, file);
wake_up(&hw->open_wait);
}
if (hw->used > 0)
hw->used--;
snd_card_file_remove(hw->card, file);
mutex_unlock(&hw->open_mutex);
wake_up(&hw->open_wait);
snd_card_file_remove(hw->card, file);
module_put(mod);
return err;
}