io_uring/register: set ctx->restricted when restrictions are parsed

Rather than defer this until the rings are enabled, just set it
upfront when the restrictions are parsed and enabled anyway. There's
no reason to defer this setting until the rings are enabled.

Reviewed-by: Gabriel Krisman Bertazi <krisman@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

Author: axboe

io_uring/register.c

@@ -175,6 +175,8 @@ static __cold int io_register_restrictions(struct io_ring_ctx *ctx,
 		memset(&ctx->restrictions, 0, sizeof(ctx->restrictions));
 		return ret;
 	}
+	if (ctx->restrictions.registered)
+		ctx->restricted = 1;
 	return 0;
 }
 
@@ -193,9 +195,6 @@ static int io_register_enable_rings(struct io_ring_ctx *ctx)
 			io_activate_pollwq(ctx);
 	}
 
-	if (ctx->restrictions.registered)
-		ctx->restricted = 1;
-
 	/* Keep submitter_task store before clearing IORING_SETUP_R_DISABLED */
 	smp_store_release(&ctx->flags, ctx->flags & ~IORING_SETUP_R_DISABLED);
 	if (ctx->sq_data && wq_has_sleeper(&ctx->sq_data->wait))
@@ -627,7 +626,7 @@ static int __io_uring_register(struct io_ring_ctx *ctx, unsigned opcode,
 	if (ctx->submitter_task && ctx->submitter_task != current)
 		return -EEXIST;
 
-	if (ctx->restricted) {
+	if (ctx->restricted && !(ctx->flags & IORING_SETUP_R_DISABLED)) {
 		opcode = array_index_nospec(opcode, IORING_REGISTER_LAST);
 		if (!test_bit(opcode, ctx->restrictions.register_op))
 			return -EACCES;