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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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2
sound/core/rawmidi.c
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@@ -415,7 +415,7 @@ static int snd_rawmidi_open(struct inode *inode, struct file *file)
subdevice = -1;
read_lock(&card->ctl_files_rwlock);
list_for_each_entry(kctl, &card->ctl_files, list) {
if (kctl->pid == current->pid) {
if (kctl->pid == task_pid(current)) {
subdevice = kctl->prefer_rawmidi_subdevice;
if (subdevice != -1)
break;