1*1f5207b7SJohn Levon void _spin_lock(int name); 2*1f5207b7SJohn Levon void _spin_unlock(int name); 3*1f5207b7SJohn Levon int _spin_trylock(int name); 4*1f5207b7SJohn Levon 5*1f5207b7SJohn Levon int a; 6*1f5207b7SJohn Levon int b; 7*1f5207b7SJohn Levon int func (void) 8*1f5207b7SJohn Levon { 9*1f5207b7SJohn Levon int mylock = 1; 10*1f5207b7SJohn Levon int mylock2 = 1; 11*1f5207b7SJohn Levon int mylock3 = 1; 12*1f5207b7SJohn Levon 13*1f5207b7SJohn Levon if (!_spin_trylock(mylock)) { 14*1f5207b7SJohn Levon return; 15*1f5207b7SJohn Levon } 16*1f5207b7SJohn Levon 17*1f5207b7SJohn Levon _spin_unlock(mylock); 18*1f5207b7SJohn Levon _spin_unlock(mylock2); 19*1f5207b7SJohn Levon 20*1f5207b7SJohn Levon if (a) 21*1f5207b7SJohn Levon _spin_unlock(mylock); 22*1f5207b7SJohn Levon _spin_lock(mylock2); 23*1f5207b7SJohn Levon 24*1f5207b7SJohn Levon if (!_spin_trylock(mylock3)) 25*1f5207b7SJohn Levon return; 26*1f5207b7SJohn Levon return; 27*1f5207b7SJohn Levon } 28*1f5207b7SJohn Levon /* 29*1f5207b7SJohn Levon * check-name: Smatch locking #2 30*1f5207b7SJohn Levon * check-command: smatch --project=kernel sm_locking2.c 31*1f5207b7SJohn Levon * 32*1f5207b7SJohn Levon * check-output-start 33*1f5207b7SJohn Levon sm_locking2.c:21 func() error: double unlock 'spin_lock:mylock' 34*1f5207b7SJohn Levon sm_locking2.c:26 func() warn: inconsistent returns 'spin_lock:mylock3'. 35*1f5207b7SJohn Levon Locked on: line 26 36*1f5207b7SJohn Levon Unlocked on: line 14 37*1f5207b7SJohn Levon line 25 38*1f5207b7SJohn Levon * check-output-end 39*1f5207b7SJohn Levon */ 40