From nobody Sun Feb 8 13:27:31 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 E38081FF7C8 for ; Mon, 19 Jan 2026 06:13:36 +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=1768803219; cv=none; b=JVeb5VMK6A7v27UqEasPiablD6L45TUr/1cwg3rey8PlLuY2KJRg3W8IJvRsUHL2k5c3+ZwDb1XdQa0Hv35fMMDIlKR/Vgx+n6m1tEq938ujeGYiMUSzf5qX6yJ6+40yy4CWaVoe5IMrKCr6ovy4QpwM5MNjaN0jJLInSzRTJxc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768803219; c=relaxed/simple; bh=ThQnqfi3crKid6KxnsX0v58j0cPHiJtSeCB5RyDuTyY=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=P0xuad/BSXWIs9NrFEKgRTLL8EZpPf8wzDojsQ4mHwaaBgrr67YRV2rUGqWaC2vlX2+klR9AM16E//qURQDiMkOXWaYkireAKyog3STwVxb8ZCdJu11H3E8QlWyuURlrh/qk+GLTWJ3yyz14PvBd0yjLUyIjbQ9HLG26FInDbtE= 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 rQCowABHZt2Iy21p5ue9BQ--.20122S2; Mon, 19 Jan 2026 14:13:28 +0800 (CST) From: Chen Ni To: agust@denx.de, maddy@linux.ibm.com, mpe@ellerman.id.au, npiggin@gmail.com, chleroy@kernel.org, tglx@kernel.org, brgl@kernel.org, jirislaby@kernel.org Cc: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, Chen Ni Subject: [PATCH] powerpc/52xx/mpc52xx_gpt: consolidate chained IRQ handler install/remove Date: Mon, 19 Jan 2026 14:12:32 +0800 Message-Id: <20260119061232.889236-1-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: rQCowABHZt2Iy21p5ue9BQ--.20122S2 X-Coremail-Antispam: 1UD129KBjvJXoWxJr1kJr4xWr4furWDCFW5trb_yoW8JFWUp3 92y3Wqkr1UGF10v3W7AF4UWr17uFyrur4UGw4q93ySvw4jqryFqFyrAw1fZF4fArW3WF1I yrs8KrWvvFs3CaDanT9S1TB71UUUUUDqnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUU9E14x267AKxVW8JVW5JwAFc2x0x2IEx4CE42xK8VAvwI8IcIk0 rVWrJVCq3wAFIxvE14AKwVWUJVWUGwA2ocxC64kIII0Yj41l84x0c7CEw4AK67xGY2AK02 1l84ACjcxK6xIIjxv20xvE14v26ryj6F1UM28EF7xvwVC0I7IYx2IY6xkF7I0E14v26F4j 6r4UJwA2z4x0Y4vEx4A2jsIE14v26F4UJVW0owA2z4x0Y4vEx4A2jsIEc7CjxVAFwI0_Gc CE3s1le2I262IYc4CY6c8Ij28IcVAaY2xG8wAqx4xG64xvF2IEw4CE5I8CrVC2j2WlYx0E 2Ix0cI8IcVAFwI0_Wrv_ZF1lYx0Ex4A2jsIE14v26rkl6F8dMcvjeVCFs4IE7xkEbVWUJV W8JwACjcxG0xvY0x0EwIxGrwACjI8F5VA0II8E6IAqYI8I648v4I1lFIxGxcIEc7CjxVA2 Y2ka0xkIwI1lc7CjxVAaw2AFwI0_Jw0_GFylc2xSY4AK67AK6r47MxAIw28IcxkI7VAKI4 8JMxC20s026xCaFVCjc4AY6r1j6r4UMI8I3I0E5I8CrVAFwI0_Jr0_Jr4lx2IqxVCjr7xv wVAFwI0_JrI_JrWlx4CE17CEb7AF67AKxVWUtVW8ZwCIc40Y0x0EwIxGrwCI42IY6xIIjx v20xvE14v26r1j6r1xMIIF0xvE2Ix0cI8IcVCY1x0267AKxVW8JVWxJwCI42IY6xAIw20E Y4v20xvaj40_Jr0_JF4lIxAIcVC2z280aVAFwI0_Jr0_Gr1lIxAIcVC2z280aVCY1x0267 AKxVW8JVW8JrUvcSsGvfC2KfnxnUUI43ZEXa7sR_E_M7UUUUU== 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 Reviewed-by: Bartosz Golaszewski --- arch/powerpc/platforms/52xx/mpc52xx_gpt.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/arch/powerpc/platforms/52xx/mpc52xx_gpt.c b/arch/powerpc/platf= orms/52xx/mpc52xx_gpt.c index 7748b6641a3c..e8163fdee69a 100644 --- a/arch/powerpc/platforms/52xx/mpc52xx_gpt.c +++ b/arch/powerpc/platforms/52xx/mpc52xx_gpt.c @@ -253,8 +253,7 @@ mpc52xx_gpt_irq_setup(struct mpc52xx_gpt_priv *gpt, str= uct device_node *node) return; } =20 - irq_set_handler_data(cascade_virq, gpt); - irq_set_chained_handler(cascade_virq, mpc52xx_gpt_irq_cascade); + irq_set_chained_handler_and_data(cascade_virq, mpc52xx_gpt_irq_cascade, g= pt); =20 /* If the GPT is currently disabled, then change it to be in Input * Capture mode. If the mode is non-zero, then the pin could be --=20 2.25.1