control: remove snd_konctrol_volatile::owner_pid field

We do not need to save the ID of the process that locked a control
because that information is already available in the owner's file data.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 0 insertions, 1 deletions

diff --git a/include/sound/control.h b/include/sound/control.h
index ef96f07aa03b..3517745d0a2d 100644
--- a/include/sound/control.h
+++ b/include/sound/control.h
@@ -56,7 +56,6 @@ struct snd_kcontrol_new {
 
 struct snd_kcontrol_volatile {
         struct snd_ctl_file *owner;     /* locked */
-        pid_t owner_pid;
         unsigned int access;    /* access rights */
 };