From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 816EF1863 for ; Wed, 28 Dec 2022 14:47:31 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 06BAEC433D2; Wed, 28 Dec 2022 14:47:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1672238851; bh=xLMSABwJiBXNgc997gcjKHd9GNASxvEMxkI0yI52mec=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=08QPh2JLfzodkNyyDvbBmdzP5uQX2W8fPwbbpMjtMaZ9fYiMtzUYBdOE/ZL8nDic2 UE5CiUUSQ8RMzQejNSFqzymrR/D/quvuFr9yD1KbTq9gTUGfgYTe1Vug3zJAutnsVR MH4lXS9K41wAkOTCTmWvGr/FMlHRbsoTXk5UwN3k= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Shang XiaoJing , Punit Agrawal , Will Deacon , Sasha Levin Subject: [PATCH 5.15 034/731] perf/arm_dmc620: Fix hotplug callback leak in dmc620_pmu_init() Date: Wed, 28 Dec 2022 15:32:21 +0100 Message-Id: <20221228144257.540461642@linuxfoundation.org> X-Mailer: git-send-email 2.39.0 In-Reply-To: <20221228144256.536395940@linuxfoundation.org> References: <20221228144256.536395940@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Shang XiaoJing [ Upstream commit d9f564c966e63925aac4ba273a9319d7fb6f4b4e ] dmc620_pmu_init() won't remove the callback added by cpuhp_setup_state_multi() when platform_driver_register() failed. Remove the callback by cpuhp_remove_multi_state() in fail path. Similar to the handling of arm_ccn_init() in commit 26242b330093 ("bus: arm-ccn: Prevent hotplug callback leak") Fixes: 53c218da220c ("driver/perf: Add PMU driver for the ARM DMC-620 memory controller") Signed-off-by: Shang XiaoJing Reviewed-by: Punit Agrawal Link: https://lore.kernel.org/r/20221115115540.6245-2-shangxiaojing@huawei.com Signed-off-by: Will Deacon Signed-off-by: Sasha Levin --- drivers/perf/arm_dmc620_pmu.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/drivers/perf/arm_dmc620_pmu.c b/drivers/perf/arm_dmc620_pmu.c index 280a6ae3e27c..54aa4658fb36 100644 --- a/drivers/perf/arm_dmc620_pmu.c +++ b/drivers/perf/arm_dmc620_pmu.c @@ -725,6 +725,8 @@ static struct platform_driver dmc620_pmu_driver = { static int __init dmc620_pmu_init(void) { + int ret; + cpuhp_state_num = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, DMC620_DRVNAME, NULL, @@ -732,7 +734,11 @@ static int __init dmc620_pmu_init(void) if (cpuhp_state_num < 0) return cpuhp_state_num; - return platform_driver_register(&dmc620_pmu_driver); + ret = platform_driver_register(&dmc620_pmu_driver); + if (ret) + cpuhp_remove_multi_state(cpuhp_state_num); + + return ret; } static void __exit dmc620_pmu_exit(void) -- 2.35.1