validation/sm_locking.c

   1 _spin_lock(int name);
   2 _spin_unlock(int name);
   3
   4 int a;
   5 int b;
   6 int func (void)
   7 {
   8         int mylock = 1;
   9         int mylock2 = 1;
  10         int mylock3 = 1;
  11
  12         if (a) {
  13                 return;
  14         }
  15
  16         _spin_lock(mylock);
  17         _spin_unlock(mylock);
  18
  19         if (b) {
  20                 _spin_unlock(mylock2);
  21                 return;
  22         }
  23
  24         if (a)
  25                 _spin_lock(mylock3);
  26         return;
  27 }
  28 /*
  29  * check-name: Locking #1
  30  * check-command: smatch sm_locking.c
  31  *
  32  * check-output-start
  33 sm_locking.c +26 func(20) warn: 'mylock3' is sometimes locked here and sometimes unlocked.
  34 sm_locking.c +26 func(20) warn: lock 'mylock2' held on line 26 but not on 21.
  35  * check-output-end
  36  */