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[ALSA] Handle file operations during snd_card disconnects using static file->f_op

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Alsa used to kmalloc one file->f_op per file per disconnecting snd_card.
This led to oopses sometimes when file->f_op was freed before __fput()
finished.
Patch adds a virtual device for disconnect: VDD.
VDD consists of:
	LIST_HEAD(shutdown_files)
	    protected by DEFINE_SPINLOCK(shutdown_mutex)
	static struct file_operations snd_shutdown_f_ops
	    and functions assigned to it
	Additions to struct snd_monitor_file
	    to specify if instance is hidden by VDD or not.
A VDD's instance is
	created in snd_card_disconnect() under the card->files_lock.
	cleaned up in snd_card_file_remove() under the card->files_lock.

Signed-off-by: Karsten Wiese <[email protected]>
Signed-off-by: Takashi Iwai <[email protected]>
Signed-off-by: Jaroslav Kysela <[email protected]>
This commit is contained in:
Karsten Wiese 2006-10-06 16:08:27 +02:00 • committed by Jaroslav Kysela
commit a9edfc6022
2 changed files with 54 additions and 42 deletions
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4
include/sound/core.h
View file

@ -89,10 +89,10 @@ struct snd_device {
struct snd_monitor_file {
struct file *file;
struct snd_monitor_file *next;
const struct file_operations *disconnected_f_op;
struct list_head shutdown_list;
};
struct snd_shutdown_f_ops; /* define it later in init.c */
/* main structure for soundcard */
struct snd_card {