From patchwork Mon May 16 19:36:36 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 573860 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5F8ACC433FE for ; Mon, 16 May 2022 19:43:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1345739AbiEPTnd (ORCPT ); Mon, 16 May 2022 15:43:33 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42568 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1346108AbiEPTmv (ORCPT ); Mon, 16 May 2022 15:42:51 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 73D203F899; Mon, 16 May 2022 12:41:35 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 10ADE6154E; Mon, 16 May 2022 19:41:35 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 03B1FC385AA; Mon, 16 May 2022 19:41:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1652730094; bh=B/wBU/3yYMoyIDUGiDWU4G/wdyYj+h+8bde02J7E3ag=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=GSW/aoaR7PqQjnQaGNEix7nJMtjJmstMhJTdV048IglRg47gD+doqQrYVZyarFrIi Wk2c9odsUnaiHexq6nK829zGIQlN9VdKZ4P1i4ockgzjGn2CP1zZXTPS6AoyfYTnDq 2MALkRwRXhmh3MYFztdEkDeg6Ylg+Wyni5sUFEPM= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= , Heikki Krogerus , Guenter Roeck Subject: [PATCH 4.19 22/32] usb: typec: tcpci: Dont skip cleanup in .remove() on error Date: Mon, 16 May 2022 21:36:36 +0200 Message-Id: <20220516193615.431436430@linuxfoundation.org> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20220516193614.773450018@linuxfoundation.org> References: <20220516193614.773450018@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Uwe Kleine-König commit bbc126ae381cf0a27822c1f822d0aeed74cc40d9 upstream. Returning an error value in an i2c remove callback results in an error message being emitted by the i2c core, but otherwise it doesn't make a difference. The device goes away anyhow and the devm cleanups are called. In this case the remove callback even returns early without stopping the tcpm worker thread and various timers. A work scheduled on the work queue, or a firing timer after tcpci_remove() returned probably results in a use-after-free situation because the regmap and driver data were freed. So better make sure that tcpci_unregister_port() is called even if disabling the irq failed. Also emit a more specific error message instead of the i2c core's "remove failed (EIO), will be ignored" and return 0 to suppress the core's warning. This patch is (also) a preparation for making i2c remove callbacks return void. Fixes: 3ba76256fc4e ("usb: typec: tcpci: mask event interrupts when remove driver") Signed-off-by: Uwe Kleine-König Cc: stable Acked-by: Heikki Krogerus Reviewed-by: Guenter Roeck Link: https://lore.kernel.org/r/20220502080456.21568-1-u.kleine-koenig@pengutronix.de Signed-off-by: Greg Kroah-Hartman --- drivers/usb/typec/tcpci.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/usb/typec/tcpci.c +++ b/drivers/usb/typec/tcpci.c @@ -601,7 +601,7 @@ static int tcpci_remove(struct i2c_clien /* Disable chip interrupts before unregistering port */ err = tcpci_write16(chip->tcpci, TCPC_ALERT_MASK, 0); if (err < 0) - return err; + dev_warn(&client->dev, "Failed to disable irqs (%pe)\n", ERR_PTR(err)); tcpci_unregister_port(chip->tcpci);