io_uring: initialize percpu refcounters using PERCU_REF_ALLOW_REINIT

Percpu reference counters should now be initialized with the PERCPU_REF_ALLOW_REINIT in order to allow switching them to the percpu mode from the atomic mode. This is exactly what percpu_ref_reinit() called from __io_uring_register() is supposed to do. So let's initialize percpu refcounters with the PERCU_REF_ALLOW_REINIT flag. Signed-off-by: Roman Gushchin <[email protected]> Acked-by: Tejun Heo <[email protected]> Signed-off-by: Dennis Zhou <[email protected]>
jb55 · May 9, 2019 · 2148289 · 2148289
1 parent 09ed79d
commit 2148289
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/fs/io_uring.c b/fs/io_uring.c
@@ -389,7 +389,8 @@ static struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p)
 	if (!ctx)
 		return NULL;
 
-	if (percpu_ref_init(&ctx->refs, io_ring_ctx_ref_free, 0, GFP_KERNEL)) {
+	if (percpu_ref_init(&ctx->refs, io_ring_ctx_ref_free,
+			    PERCPU_REF_ALLOW_REINIT, GFP_KERNEL)) {
 		kfree(ctx);
 		return NULL;
 	}