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 1093647791; Mon, 8 Jan 2024 15:14:37 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="MWDKSFPa" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7ED66C433CB; Mon, 8 Jan 2024 15:14:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1704726876; bh=EDgatXhHgcjA0cwU/mrXZB/1y7+Tvs7Vf8jOAxmqF9Q=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=MWDKSFPaA6bTFXuRsKdWDT1hpcqIXpTMLze6eDSgFbDTwWL/PxrdfQWgpq3D/PEwm Bpzf+5d9v1IJG2b4e/hYr3spcaGnAo/livdmltg1+otJTXosinjZezNKnH3njoREqT kYgCAsWpxNJUqptBJ5y3Voouv6uirMtLcokK9lnA= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Jonathan Cameron , Ira Weiny , Dave Jiang , Dan Williams , Sasha Levin Subject: [PATCH 6.6 106/124] cxl/pmu: Ensure put_device on pmu devices Date: Mon, 8 Jan 2024 16:08:52 +0100 Message-ID: <20240108150607.845391746@linuxfoundation.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240108150602.976232871@linuxfoundation.org> References: <20240108150602.976232871@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Ira Weiny [ Upstream commit ef3d5cf9c59cccb012aa6b93d99f4c6eb5d6648e ] The following kmemleaks were detected when removing the cxl module stack: unreferenced object 0xffff88822616b800 (size 1024): ... backtrace: [<00000000bedc6f83>] kmalloc_trace+0x26/0x90 [<00000000448d1afc>] devm_cxl_pmu_add+0x3a/0x110 [cxl_core] [<00000000ca3bfe16>] 0xffffffffa105213b [<00000000ba7f78dc>] local_pci_probe+0x41/0x90 [<000000005bb027ac>] pci_device_probe+0xb0/0x1c0 ... unreferenced object 0xffff8882260abcc0 (size 16): ... hex dump (first 16 bytes): 70 6d 75 5f 6d 65 6d 30 2e 30 00 26 82 88 ff ff pmu_mem0.0.&.... backtrace: ... [<00000000152b5e98>] dev_set_name+0x43/0x50 [<00000000c228798b>] devm_cxl_pmu_add+0x102/0x110 [cxl_core] [<00000000ca3bfe16>] 0xffffffffa105213b [<00000000ba7f78dc>] local_pci_probe+0x41/0x90 [<000000005bb027ac>] pci_device_probe+0xb0/0x1c0 ... unreferenced object 0xffff8882272af200 (size 256): ... backtrace: [<00000000bedc6f83>] kmalloc_trace+0x26/0x90 [<00000000a14d1813>] device_add+0x4ea/0x890 [<00000000a3f07b47>] devm_cxl_pmu_add+0xbe/0x110 [cxl_core] [<00000000ca3bfe16>] 0xffffffffa105213b [<00000000ba7f78dc>] local_pci_probe+0x41/0x90 [<000000005bb027ac>] pci_device_probe+0xb0/0x1c0 ... devm_cxl_pmu_add() correctly registers a device remove function but it only calls device_del() which is only part of device unregistration. Properly call device_unregister() to free up the memory associated with the device. Fixes: 1ad3f701c399 ("cxl/pci: Find and register CXL PMU devices") Cc: Jonathan Cameron Signed-off-by: Ira Weiny Reviewed-by: Jonathan Cameron Reviewed-by: Dave Jiang Link: https://lore.kernel.org/r/20231016-pmu-unregister-fix-v1-1-1e2eb2fa3c69@intel.com Signed-off-by: Dan Williams Signed-off-by: Sasha Levin --- drivers/cxl/core/pmu.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/cxl/core/pmu.c b/drivers/cxl/core/pmu.c index 7684c843e5a59..5d8e06b0ba6e8 100644 --- a/drivers/cxl/core/pmu.c +++ b/drivers/cxl/core/pmu.c @@ -23,7 +23,7 @@ const struct device_type cxl_pmu_type = { static void remove_dev(void *dev) { - device_del(dev); + device_unregister(dev); } int devm_cxl_pmu_add(struct device *parent, struct cxl_pmu_regs *regs, -- 2.43.0