io_ring_exit_work() checks ifq before shutting it down and guarantees
that the pointer is stable, but instead of relying on rather complicated
synchronisation recheck the ifq pointer inside.
Reported-by: Kees Bakker <kees@xxxxxxxxxxxx>
Signed-off-by: Pavel Begunkov <asml.silence@xxxxxxxxx>
---
io_uring/zcrx.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/io_uring/zcrx.c b/io_uring/zcrx.c
index 026efb8dd381..a9eaab3fccf2 100644
--- a/io_uring/zcrx.c
+++ b/io_uring/zcrx.c
@@ -489,9 +489,9 @@ void io_shutdown_zcrx_ifqs(struct io_ring_ctx *ctx)
{
lockdep_assert_held(&ctx->uring_lock);
- if (ctx->ifq)
- io_zcrx_scrub(ctx->ifq);
-
+ if (!ctx->ifq)
+ return;
+ io_zcrx_scrub(ctx->ifq);
io_close_queue(ctx->ifq);
}
--
2.48.1
