From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-wr1-f41.google.com (mail-wr1-f41.google.com [209.85.221.41]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B3B9B2BB13 for ; Fri, 2 May 2025 07:53:09 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.221.41 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746172391; cv=none; b=lJylAjcjF4OI4iOJ+1QkG8Uzkzonkzw8tA2EkHzMcJnPorIfe5mjBfRPY+swDd7HHBMy9GQqbMyIzb6M89LToQyR98HnQZELKJLCJNybd+ni96u+8PUxqpuW3sgBYFBQfeUtQrWKTjx+fxi6uJSmY0dkFuZrpHb1kAFB2HW1oeY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746172391; c=relaxed/simple; bh=5ZCByJJL0Ye6jvativsjrsfB/Ql+BeNq0mFm8G1cuO0=; h=Date:From:To:Cc:Subject:Message-ID:MIME-Version:Content-Type: Content-Disposition; b=b2VZ3efWKfb2UtCdIWkkneu4r0li3+l/URpAPV8XpInKCHKzEMj9sQzTLsx455fobOwyeB86T3wqSl6wuTmvJdk3vxEZ+pIZLZxpswn4BvJF968dcfHKJ4XQ4EXlZNtiPwkHK50QCQ8vQSpfBqEUq24bneLHXyc/HbLUQ0WMsRU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linaro.org; spf=pass smtp.mailfrom=linaro.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b=CJwbSugC; arc=none smtp.client-ip=209.85.221.41 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linaro.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linaro.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="CJwbSugC" Received: by mail-wr1-f41.google.com with SMTP id ffacd0b85a97d-39c1ef4acf2so1203634f8f.0 for ; Fri, 02 May 2025 00:53:09 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1746172388; x=1746777188; darn=vger.kernel.org; h=content-disposition:mime-version:message-id:subject:cc:to:from:date :from:to:cc:subject:date:message-id:reply-to; bh=YIYUYTbkSYrP8WnVzdIpYswDWWAUAS3GFOeRKeDzwWg=; b=CJwbSugCwj4+hVoKHUavJngh2taNQQJ9QGtte4zb11JY1khMBQ5KXfhBh5MZWK3EOj bICZi17K1WkNTR+5ajyOaHTztaiD+Xv0OTCWE/nIYpf/lugCLazp/OgLmvt2LY1sCyE2 gaS4rRy5KZq+qkksPtjfEFJzbyDedI6J05RtNwnRYP2f8wY7Vi0H5awrv5pWE6cF3xLB F7bWLQMEdB19/UXfhUJahOgsZY5Odn5xyJelQ+Pd2QAIGfd0xj9nBEuniZnEj88S+XJq SJ/F6degAkzfJYYppqk1n12drVwYHP1iujzkw68e5T2+zCzd7WWarov68mRu/7XEF2BE rPXQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1746172388; x=1746777188; h=content-disposition:mime-version:message-id:subject:cc:to:from:date :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=YIYUYTbkSYrP8WnVzdIpYswDWWAUAS3GFOeRKeDzwWg=; b=cGB+Kv39JaArOCvyc4tcGLxMamcKH4H2HLFuOfDGj++a+W25NoSztljbQl7KrbinAT CFIk7JgJb7lN60gusJr/ru+BK/fKMvDDAUSAGMpL+QKG+YcAIQF/rWgk5+p10m33b+8x k+1Fahq0NXGVOSIlbubSfFDHetno03ZNktIg+Q3Fna5gL72m0z1gnXElOirdEe09Pf4w whiTowFrRW/zXSmbl0V03Zv1o/Mc0bS1ipeU1K2WT6OuOm10QeRYl4v3FG5k7HDTyXXz meXXDR8UfOpHVyR4z1iO0r+h7x56sR8CMr2NITigU3BSSW3F5PL7KHo4G95onlj5LWTr 58AQ== X-Forwarded-Encrypted: i=1; AJvYcCUQOXNRIsk56YPsrVUzObKmsqfbRaH4pYqzrssKDIAcj82KNxd3mQvU7yHZZ953X5aBGc1Hk25yjXKm@vger.kernel.org X-Gm-Message-State: AOJu0YyMpJTHV+r2751WF7a3XMWqCPyG84J5uqK0IFT+XSdoHWDGO9I9 lT48F0Rx5E8/CeZRg4DnAcC2xM6bBAXJeRnuNrxZvxqeIGSo+PB2a1y6WqeRtM4= X-Gm-Gg: ASbGncuxAlK66I+Kv+yXFGu5uSxCcN9lXpHAqyxGp+CZRN65u1WvjesYh6IkLacbS3k 8VQpo9dQPnh3UeY0bJVeB6Q2xDekWOfRXhrqGHbLBxmAw2LW6iMO6ExXgaw8kfbrChZE6YdqzTU JgZKvspjCwk4fGqc59DwPbfGut2JpuFUHlerzjRWfot4FV/utmhKXZglYHPCld1n1HiOP6mHVh9 hl5qxpESYTTbihGg5vdUuJXUO+CV2uX3K3bY/A7WN9eohiuumUhNiQu9jCeGzlZyNNw40RQSc4B uhrN+0sbwvvq8N2CdnHBxPp9xzj9I2dL/mIo//v/OHE8ow== X-Google-Smtp-Source: AGHT+IFUF0mleYLp1kLBLB8JmgDr7cOlyFKFxJ+vLZzJOkd+YMspUaspCgieTiAUbD8s7VruSkm7fQ== X-Received: by 2002:a05:6000:1008:b0:3a0:99b1:bab5 with SMTP id ffacd0b85a97d-3a099b1bae6mr1003895f8f.57.1746172387978; Fri, 02 May 2025 00:53:07 -0700 (PDT) Received: from localhost ([196.207.164.177]) by smtp.gmail.com with UTF8SMTPSA id 5b1f17b1804b1-441b8a315d3sm36125375e9.36.2025.05.02.00.53.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 02 May 2025 00:53:07 -0700 (PDT) Date: Fri, 2 May 2025 10:53:03 +0300 From: Dan Carpenter To: Keguang Zhang Cc: linux-mips@vger.kernel.org, linux-mtd@lists.infradead.org, Laurent Pinchart , devicetree@vger.kernel.org Subject: [bug report] mtd: rawnand: Add Loongson-1 NAND Controller Driver Message-ID: Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Hello Keguang Zhang, Commit d2d10ede04b1 ("mtd: rawnand: Add Loongson-1 NAND Controller Driver") from Mar 20, 2025 (linux-next), leads to the following Smatch static checker warning: drivers/mtd/nand/raw/loongson1-nand-controller.c:730 ls1x_nand_chip_init() warn: inconsistent refcounting 'chip_np->kobj.kref.refcount.refs.counter': drivers/mtd/nand/raw/loongson1-nand-controller.c 690 static int ls1x_nand_chip_init(struct ls1x_nand_host *host) 691 { 692 struct device *dev = host->dev; 693 int nchips = of_get_child_count(dev->of_node); 694 struct device_node *chip_np; 695 struct nand_chip *chip = &host->chip; 696 struct mtd_info *mtd = nand_to_mtd(chip); 697 int ret; 698 699 if (nchips != 1) 700 return dev_err_probe(dev, -EINVAL, "Currently one NAND chip supported\n"); 701 702 chip_np = of_get_next_child(dev->of_node, NULL); The of_get_next_child() function drops the reference on the current child. That's probably not what we want to happen. This is similar to a discussion we were having earlier about of_find_node_by_name(). Then it takes a reference to the new child. 703 if (!chip_np) 704 return dev_err_probe(dev, -ENODEV, "failed to get child node for NAND chip\n"); 705 706 chip->controller = &host->controller; 707 chip->options = NAND_NO_SUBPAGE_WRITE | NAND_USES_DMA | NAND_BROKEN_XD; 708 chip->buf_align = 16; 709 nand_set_controller_data(chip, host); 710 nand_set_flash_node(chip, chip_np); 711 if (!mtd->name) 712 return dev_err_probe(dev, -EINVAL, "Missing MTD label\n"); of_node_put(chip_np) before returning. 713 714 mtd->dev.parent = dev; 715 mtd->owner = THIS_MODULE; 716 717 ret = nand_scan(chip, 1); 718 if (ret) { 719 of_node_put(chip_np); 720 return dev_err_probe(dev, ret, "failed to scan NAND chip\n"); 721 } 722 723 ret = mtd_device_register(mtd, NULL, 0); 724 if (ret) { 725 nand_cleanup(chip); 726 of_node_put(chip_np); 727 return dev_err_probe(dev, ret, "failed to register MTD device\n"); 728 } 729 I think we want to call of_node_put(chip_np) before returning on the success path as well? --> 730 return 0; 731 } regards, dan carpenter