From nobody Sun Feb 8 18:23:59 2026 Received: from cstnet.cn (smtp81.cstnet.cn [159.226.251.81]) (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 1D9F623C4F3 for ; Mon, 19 Jan 2026 06:06:00 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=159.226.251.81 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768802763; cv=none; b=foN2NwcUhcb+/+qVIRMI+qyo4jAsWCDzrNe1J9jO4zakM9OXJvFe7kXdueC6EcPImfBGaw9peRH6Xxi3G+2jKLYa5T4PPCXQSTkwxzFjEjzBfqMMg/Ez3JbcG+hegwfOHDh8Zj5t2Q/h1a8vXRQH8NEGLsQZLUj11zyRkgJa17U= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768802763; c=relaxed/simple; bh=ij60Ui0yr+wxk1VRHz5HtpgHHbFJhT0Tn1WBE6WFU7A=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=MGthgZeNzimhxPmIFxpyuj8WAnsQouLU5J/Duu+gY9+T5l5YW4wJ0LU5Vf9UOo3k8IgLgeLzXW4+wIxnZEFvdhhQjt5wDXAChsuzjOu+BMGffbdUSxEcYSUbaHqbYwFZNMkQKj2k5iXmAbE/R97l3Fx6iw339mUBf3R/fyUjC/g= 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=159.226.251.81 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 (unknown [124.16.138.129]) by APP-03 (Coremail) with SMTP id rQCowACHpt27yW1pmq69BQ--.58969S2; Mon, 19 Jan 2026 14:05:47 +0800 (CST) From: Chen Ni To: agust@denx.de, maddy@linux.ibm.com, mpe@ellerman.id.au, npiggin@gmail.com, chleroy@kernel.org, jirislaby@kernel.org, tglx@kernel.org Cc: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, Chen Ni Subject: [PATCH] powerpc/52xx/media5200: Consolidate chained IRQ handler install/remove Date: Mon, 19 Jan 2026 14:04:50 +0800 Message-Id: <20260119060450.889119-1-nichen@iscas.ac.cn> X-Mailer: git-send-email 2.25.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: rQCowACHpt27yW1pmq69BQ--.58969S2 X-Coremail-Antispam: 1UD129KBjvdXoW7Jr1fKr4kGryrKryxXw1DKFg_yoWkZFg_Ww 4kZFsrXr48ArsIyrnFvr15AFy0yrW8GFy0k3ZYqanrtrn8XrWDZr10vF42kr47WF10yr43 G3sYkanxCayj9jkaLaAFLSUrUUUUbb8apTn2vfkv8UJUUUU8Yxn0WfASr-VFAUDa7-sFnT 9fnUUIcSsGvfJTRUUUbTAFF20E14v26r4j6ryUM7CY07I20VC2zVCF04k26cxKx2IYs7xG 6rWj6s0DM7CIcVAFz4kK6r1j6r18M28lY4IEw2IIxxk0rwA2F7IY1VAKz4vEj48ve4kI8w A2z4x0Y4vE2Ix0cI8IcVAFwI0_Xr0_Ar1l84ACjcxK6xIIjxv20xvEc7CjxVAFwI0_Cr0_ Gr1UM28EF7xvwVC2z280aVAFwI0_Cr1j6rxdM28EF7xvwVC2z280aVCY1x0267AKxVW0oV Cq3wAS0I0E0xvYzxvE52x082IY62kv0487Mc02F40EFcxC0VAKzVAqx4xG6I80ewAv7VC0 I7IYx2IY67AKxVWrXVW3AwAv7VC2z280aVAFwI0_XcC_AcWlOx8S6xCaFVCjc4AY6r1j6r 4UM4x0Y48IcxkI7VAKI48JM4x0x7Aq67IIx4CEVc8vx2IErcIFxwACI402YVCY1x02628v n2kIc2xKxwCY1x0262kKe7AKxVWUtVW8ZwCY02Avz4vE14v_GF1l42xK82IYc2Ij64vIr4 1l4I8I3I0E4IkC6x0Yz7v_Jr0_Gr1lx2IqxVAqx4xG67AKxVWUJVWUGwC20s026x8GjcxK 67AKxVWUGVWUWwC2zVAF1VAY17CE14v26r1q6r43MIIYrxkI7VAKI48JMIIF0xvE2Ix0cI 8IcVAFwI0_Jr0_JF4lIxAIcVC0I7IYx2IY6xkF7I0E14v26r4j6F4UMIIF0xvE42xK8VAv wI8IcIk0rVWUJVWUCwCI42IY6I8E87Iv67AKxVWUJVW8JwCI42IY6I8E87Iv6xkF7I0E14 v26r4j6r4UJbIYCTnIWIevJa73UjIFyTuYvjTRWuWlUUUUU X-CM-SenderInfo: xqlfxv3q6l2u1dvotugofq/ Content-Type: text/plain; charset="utf-8" The driver currently sets the handler data and the chained handler in two separate steps. This creates a theoretical race window where an interrupt could fire after the handler is set but before the data is assigned, leading to a NULL pointer dereference. Replace the two calls with irq_set_chained_handler_and_data() to set both the handler and its data atomically under the irq_desc->lock. Signed-off-by: Chen Ni --- arch/powerpc/platforms/52xx/media5200.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/powerpc/platforms/52xx/media5200.c b/arch/powerpc/platfor= ms/52xx/media5200.c index bc7f83cfec1d..c20ac8010f6d 100644 --- a/arch/powerpc/platforms/52xx/media5200.c +++ b/arch/powerpc/platforms/52xx/media5200.c @@ -176,8 +176,8 @@ static void __init media5200_init_irq(void) =20 of_node_put(fpga_np); =20 - irq_set_handler_data(cascade_virq, &media5200_irq); - irq_set_chained_handler(cascade_virq, media5200_irq_cascade); + irq_set_chained_handler_and_data(cascade_virq, media5200_irq_cascade, + &media5200_irq); =20 return; =20 --=20 2.25.1