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Thu, 29 Oct 2026 15:20:48 +0000 (UTC) Received: from mail.galae.net (mail.galae.net [212.83.136.155]) by smtpout-01.galae.net (Postfix) with ESMTPS id 6035460360; Thu, 29 Oct 2026 15:20:48 +0000 (UTC) Received: from [127.0.0.1] (localhost [127.0.0.1]) by localhost (Mailerdaemon) with ESMTPSA id 7A63910329108; Thu, 29 Oct 2026 16:20:44 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=dkim; t=1793287247; h=from:subject:date:message-id:to:cc:mime-version:content-type: content-transfer-encoding:in-reply-to:references; bh=zDXaXId2QMZQGGH0ZkoNgmI6zhuM3ACKFfQoGGvgzc0=; b=16VbpycgoGK+Bueo3Fxkz/Q35JqsNP5tV2hWIwDWhcLwgp8NkOOkwGhPp1MbQ2QYG/ygPF DV1w/R0AU0yrE1vtbn4ta5J+AKFvjeOQNjlL7XHAuo1LHvCalbwB0NLu1/3AqWFQRveILg tIaVwq9LI8hNHb719+KcfM9x6VJ6JhWaXFtZhiiNKbzjKJNBNcSP5mSejyPHMG9mklfdHm 89s8/0bWGr54x6edPik3VTQIlzXQYMN5V9WDPLSd790LDd9enfTuPRH66RB4B8j6YioU1G BwwcB7Ztty22BcfDSskDeOQqXE5tyTa79Qg5aJJBO28Kx2J0O3+7+4WIi9mSQg== From: Miquel Raynal To: Yige Jiang Cc: linux-mtd@lists.infradead.org, Vignesh Raghavendra , Tudor Ambarus , Richard Weinberger , linux-kernel@vger.kernel.org, Geert Uytterhoeven , linux-renesas-soc@vger.kernel.org Subject: Re: [PATCH] mtd: hyperbus: rpc-if: fix an OF node reference leak In-Reply-To: (Yige Jiang's message of "Thu, 29 Oct 2026 00:47:40 +0800") References: User-Agent: mu4e 1.12.12; emacs 30.2 Date: Thu, 29 Oct 2026 16:20:43 +0100 Message-ID: <87se1oedo4.fsf@bootlin.com> X-Mailing-List: linux-renesas-soc@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-Last-TLS-Session-Version: TLSv1.3 On 29/10/2026 at 00:47:40 +08, Yige Jiang wrote: > rpcif_hb_probe() gets a child-node reference with of_get_next_child(). > The HyperBus core does not consume it, so the driver leaks the > reference on registration failure and remove. > > Put the node on registration failure and after unregistering the > HyperBus device on remove. Leave hardware initialization failures on > out_disable_rpm, since no node reference has been acquired there. > > Fixes: 5de15b610f78 ("mtd: hyperbus: add Renesas RPC-IF driver") > Assisted-by: LLM > Signed-off-by: Yige Jiang > --- > Based on linux-next next-20261016 (2efb7a11f1aa). > Compile-tested: arm64, GCC 14.2.0, W=3D1, CONFIG_OF_DYNAMIC=3Dy. > COMPILE_TEST=3Dy. > The object was built from this exact base with the patch applied. > No full kernel or module-link, hardware or runtime test was performed. > > drivers/mtd/hyperbus/rpc-if.c | 5 ++++- > 1 file changed, 4 insertions(+), 1 deletion(-) > > diff --git a/drivers/mtd/hyperbus/rpc-if.c b/drivers/mtd/hyperbus/rpc-if.c > index f448e23f9260f10abe17842849b312365dcd8294..aa69abe6d6bc674bb8cdb531b= badfb7b356e3123 100644 > --- a/drivers/mtd/hyperbus/rpc-if.c > +++ b/drivers/mtd/hyperbus/rpc-if.c > @@ -145,10 +145,12 @@ static int rpcif_hb_probe(struct platform_device *p= dev) > hyperbus->hbdev.np =3D of_get_next_child(pdev->dev.parent->of_node, NUL= L); > error =3D hyperbus_register_device(&hyperbus->hbdev); > if (error) > - goto out_disable_rpm; > + goto out_put_node; >=20=20 > return 0; >=20=20 > +out_put_node: > + of_node_put(hyperbus->hbdev.np); > out_disable_rpm: > pm_runtime_disable(hyperbus->rpc.dev); > return error; > @@ -161,6 +163,7 @@ static void rpcif_hb_remove(struct platform_device *p= dev) > hyperbus_unregister_device(&hyperbus->hbdev); >=20=20 > pm_runtime_disable(hyperbus->rpc.dev); > + of_node_put(hyperbus->hbdev.np); > } >=20=20 In general we always apply the same order in the probe error path and in the remove path. This is not respected here? Thanks, Miqu=C3=A8l