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authorKarsten Wiese <fzu@wemgehoertderstaat.de>2006-10-06 16:08:27 +0200
committerJaroslav Kysela <perex@suse.cz>2006-10-06 20:23:04 +0200
commita9edfc60227a1dc5c741666ff252a6055b73b184 (patch)
tree15993e126624ec9e05f33f957ee4f69bd4787220 /include/sound/core.h
parent4130d59b1ac6e32c130bd59dbce5eb30fede0197 (diff)
[ALSA] Handle file operations during snd_card disconnects using static file->f_op
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 <fzu@wemgehoertderstaat.de> Signed-off-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Jaroslav Kysela <perex@suse.cz>
Diffstat (limited to 'include/sound/core.h')
-rw-r--r--include/sound/core.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/include/sound/core.h b/include/sound/core.h
index b056ea925ec..fa1ca0127ba 100644
--- a/include/sound/core.h
+++ b/include/sound/core.h
@@ -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 {