diff options
Diffstat (limited to 'kernel/bpf/syscall.c')
| -rw-r--r-- | kernel/bpf/syscall.c | 19 |
1 files changed, 18 insertions, 1 deletions
diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c index 98a69bd83069..a1b14d197a4f 100644 --- a/kernel/bpf/syscall.c +++ b/kernel/bpf/syscall.c @@ -432,6 +432,23 @@ static void free_used_maps(struct bpf_prog_aux *aux) kfree(aux->used_maps); } +static void __prog_put_rcu(struct rcu_head *rcu) +{ + struct bpf_prog_aux *aux = container_of(rcu, struct bpf_prog_aux, rcu); + + free_used_maps(aux); + bpf_prog_free(aux->prog); +} + +/* version of bpf_prog_put() that is called after a grace period */ +void bpf_prog_put_rcu(struct bpf_prog *prog) +{ + if (atomic_dec_and_test(&prog->aux->refcnt)) { + prog->aux->prog = prog; + call_rcu(&prog->aux->rcu, __prog_put_rcu); + } +} + void bpf_prog_put(struct bpf_prog *prog) { if (atomic_dec_and_test(&prog->aux->refcnt)) { @@ -445,7 +462,7 @@ static int bpf_prog_release(struct inode *inode, struct file *filp) { struct bpf_prog *prog = filp->private_data; - bpf_prog_put(prog); + bpf_prog_put_rcu(prog); return 0; } |