Merge tag 'ptrace-cleanups-for-v5.18' of git://git.kernel.org/pub/scm/linux/kernel...

[linux-2.6-microblaze.git] / kernel / time / posix-cpu-timers.c

diff --git a/kernel/time/posix-cpu-timers.c b/kernel/time/posix-cpu-timers.c
index 9190d9e..0a97193 100644 (file)
--- a/kernel/time/posix-cpu-timers.c
+++ b/kernel/time/posix-cpu-timers.c
@@ -35,14 +35,20 @@ void posix_cputimers_group_init(struct posix_cputimers *pct, u64 cpu_limit)
  * tsk->signal->posix_cputimers.bases[clock].nextevt expiration cache if
  * necessary. Needs siglock protection since other code may update the
  * expiration cache as well.
+ *
+ * Returns 0 on success, -ESRCH on failure.  Can fail if the task is exiting and
+ * we cannot lock_task_sighand.  Cannot fail if task is current.
  */
-void update_rlimit_cpu(struct task_struct *task, unsigned long rlim_new)
+int update_rlimit_cpu(struct task_struct *task, unsigned long rlim_new)
 {
        u64 nsecs = rlim_new * NSEC_PER_SEC;
+       unsigned long irq_fl;
 
-       spin_lock_irq(&task->sighand->siglock);
+       if (!lock_task_sighand(task, &irq_fl))
+               return -ESRCH;
        set_process_cpu_timer(task, CPUCLOCK_PROF, &nsecs, NULL);
-       spin_unlock_irq(&task->sighand->siglock);
+       unlock_task_sighand(task, &irq_fl);
+       return 0;
 }
 
 /*