The in_atomic macro cannot always detect atomic context. In particular,
it cannot know about held spinlocks in non-preemptible kernels. Although,
there is no user call bpf_link_put() with holding spinlock now. Be the
safe side, we can avoid this in the feature.
Signed-off-by: Muchun Song <songmuc...@bytedance.com>
---
kernel/bpf/syscall.c | 8 ++------
1 file changed, 2 insertions(+), 6 deletions(-)
diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index 178c147350f5..6347be0a5c82 100644
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c
@@ -2345,12 +2345,8 @@ void bpf_link_put(struct bpf_link *link)
if (!atomic64_dec_and_test(&link->refcnt))
return;
- if (in_atomic()) {
- INIT_WORK(&link->work, bpf_link_put_deferred);
- schedule_work(&link->work);
- } else {
- bpf_link_free(link);
- }
+ INIT_WORK(&link->work, bpf_link_put_deferred);
+ schedule_work(&link->work);
}
static int bpf_link_release(struct inode *inode, struct file *filp)
--
2.20.1
