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control: use reference-counted pid

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Instead of storing the PID number, take a reference to the task's pid
structure.  This protects against duplicates due to PID overflows, and
using pid_vnr() ensures that the PID returned by snd_ctl_elem_info() is
correct as seen from the current namespace.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Clemens Ladisch 2009-11-02 09:35:44 +01:00 • committed by Takashi Iwai
parent 31cef7076e
commit 25d27eded1
4 changed files with 8 additions and 5 deletions
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4
include/sound/control.h
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@ -86,10 +86,12 @@ struct snd_kctl_event {
#define snd_kctl_event(n) list_entry(n, struct snd_kctl_event, list)
struct pid;
struct snd_ctl_file {
struct list_head list; /* list of all control files */
struct snd_card *card;
pid_t pid;
struct pid *pid;
int prefer_pcm_subdevice;
int prefer_rawmidi_subdevice;
wait_queue_head_t change_sleep;