From nobody Sun Feb 8 09:11:16 2026 Received: from cstnet.cn (smtp21.cstnet.cn [159.226.251.21]) (using TLSv1.2 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5324030AABC; Wed, 22 Oct 2025 08:35:17 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=159.226.251.21 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761122121; cv=none; b=rrUl8BaeX0K/puAmQP4EfMrat/Xmp9Lq/xjf7cb3DuUv+qefIZSmBnnF1+r5SSzXxnMa6/z+zh+70bFRj/uRgq7Nk2OmRZXrlywzKvTOWrMtVimSrEkkOo0A9+QhtwTI6RthD4QKLKJyY7+ziugIFfcRnDCUt/6EQZbrU0MlS6g= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761122121; c=relaxed/simple; bh=+XIX1vN/LQgjrQdE+e8SVS3VvbPoJ2R48wrnq1lpBU4=; h=From:To:Cc:Subject:Date:Message-Id; b=OSGRWV7EG/8wVESO/82H+67pRYY43Hii6kGbTdytnjX8EP2ltrWgRJSWe9kvnPYxyWf7u2rwYjQH9zFKdrrqx+VSTTwyUtmhfugG2i/YgtJgtIJZrP5T6AHAstXbew6UzM4KaRtJgV3R99nqQI6tE7rlOgLOTW7hf0wxDFx/ZhY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=iscas.ac.cn; spf=pass smtp.mailfrom=iscas.ac.cn; arc=none smtp.client-ip=159.226.251.21 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=iscas.ac.cn Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=iscas.ac.cn Received: from localhost.localdomain (unknown [202.112.113.212]) by APP-01 (Coremail) with SMTP id qwCowAD3T6Ivl_hoxsLREw--.54099S2; Wed, 22 Oct 2025 16:35:07 +0800 (CST) From: Ma Ke To: eajames@linux.ibm.com, ninad@linux.ibm.com, joel@jms.id.au, jk@ozlabs.org Cc: linux-fsi@lists.ozlabs.org, linux-kernel@vger.kernel.org, akpm@linux-foundation.org, Ma Ke , stable@vger.kernel.org Subject: [PATCH RESEND] Once cdev_device_add() failed, we should use put_device() to decrement reference count for cleanup. Or it could cause memory leak. Although operations in err_free_ida are similar to the operations in callback function fsi_slave_release(), put_device() is a correct handling operation as comments require when cdev_device_add() fails. Date: Wed, 22 Oct 2025 16:34:52 +0800 Message-Id: <20251022083452.37409-1-make24@iscas.ac.cn> X-Mailer: git-send-email 2.17.1 X-CM-TRANSID: qwCowAD3T6Ivl_hoxsLREw--.54099S2 X-Coremail-Antispam: 1UD129KBjvJXoWrtF45Ary5ur13AF48GF18Grg_yoW8Jrykpa 1DGFyFkrW8Gr48GrsrZ3WxZFZ8C3yIv34furWfGw1IkrZxAF909r10g340ka48JFWkCF4x JF9rJrykWF1DJr7anT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUvC14x267AKxVW8JVW5JwAFc2x0x2IEx4CE42xK8VAvwI8IcIk0 rVWrJVCq3wAFIxvE14AKwVWUJVWUGwA2ocxC64kIII0Yj41l84x0c7CEw4AK67xGY2AK02 1l84ACjcxK6xIIjxv20xvE14v26r4j6ryUM28EF7xvwVC0I7IYx2IY6xkF7I0E14v26r4j 6F4UM28EF7xvwVC2z280aVAFwI0_Cr1j6rxdM28EF7xvwVC2z280aVCY1x0267AKxVW0oV Cq3wAac4AC62xK8xCEY4vEwIxC4wAS0I0E0xvYzxvE52x082IY62kv0487Mc02F40EFcxC 0VAKzVAqx4xG6I80ewAv7VC0I7IYx2IY67AKxVWUJVWUGwAv7VC2z280aVAFwI0_Jr0_Gr 1lOx8S6xCaFVCjc4AY6r1j6r4UM4x0Y48IcxkI7VAKI48JM4x0x7Aq67IIx4CEVc8vx2IE rcIFxwCY1x0262kKe7AKxVWUtVW8ZwCF04k20xvY0x0EwIxGrwCFx2IqxVCFs4IE7xkEbV WUJVW8JwC20s026c02F40E14v26r1j6r18MI8I3I0E7480Y4vE14v26r106r1rMI8E67AF 67kF1VAFwI0_Jw0_GFylIxkGc2Ij64vIr41lIxAIcVC0I7IYx2IY67AKxVWUJVWUCwCI42 IY6xIIjxv20xvEc7CjxVAFwI0_Jr0_Gr1lIxAIcVCF04k26cxKx2IYs7xG6r1j6r1xMIIF 0xvEx4A2jsIE14v26r1j6r4UMIIF0xvEx4A2jsIEc7CjxVAFwI0_Jr0_GrUvcSsGvfC2Kf nxnUUI43ZEXa7VUbQVy7UUUUU== X-CM-SenderInfo: ppdnvj2u6l2u1dvotugofq/ Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" As comment of device_add() says, 'if device_add() succeeds, you should call device_del() when you want to get rid of it. If device_add() has not succeeded, use only put_device() to drop the reference count'. Found by code review. Cc: stable@vger.kernel.org Fixes: 371975b0b075 ("fsi/core: Fix error paths on CFAM init") Signed-off-by: Ma Ke --- drivers/fsi/fsi-core.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/drivers/fsi/fsi-core.c b/drivers/fsi/fsi-core.c index c6c115993ebc..444878ab9fb1 100644 --- a/drivers/fsi/fsi-core.c +++ b/drivers/fsi/fsi-core.c @@ -1084,7 +1084,8 @@ static int fsi_slave_init(struct fsi_master *master, = int link, uint8_t id) rc =3D cdev_device_add(&slave->cdev, &slave->dev); if (rc) { dev_err(&slave->dev, "Error %d creating slave device\n", rc); - goto err_free_ida; + put_device(&slave->dev); + return rc; } =20 /* Now that we have the cdev registered with the core, any fatal @@ -1110,8 +1111,6 @@ static int fsi_slave_init(struct fsi_master *master, = int link, uint8_t id) =20 return 0; =20 -err_free_ida: - fsi_free_minor(slave->dev.devt); err_free: of_node_put(slave->dev.of_node); kfree(slave); --=20 2.17.1