From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6A9C9C32751 for ; Wed, 31 Jul 2019 20:55:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 4B1B42067D for ; Wed, 31 Jul 2019 20:55:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730680AbfGaUzn (ORCPT ); Wed, 31 Jul 2019 16:55:43 -0400 Received: from inva021.nxp.com ([92.121.34.21]:36584 "EHLO inva021.nxp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728932AbfGaUzn (ORCPT ); Wed, 31 Jul 2019 16:55:43 -0400 Received: from inva021.nxp.com (localhost [127.0.0.1]) by inva021.eu-rdc02.nxp.com (Postfix) with ESMTP id DE40B200AD1; Wed, 31 Jul 2019 22:55:41 +0200 (CEST) Received: from inva024.eu-rdc02.nxp.com (inva024.eu-rdc02.nxp.com [134.27.226.22]) by inva021.eu-rdc02.nxp.com (Postfix) with ESMTP id D1020200065; Wed, 31 Jul 2019 22:55:41 +0200 (CEST) Received: from fsr-ub1864-103.ea.freescale.net (fsr-ub1864-103.ea.freescale.net [10.171.82.17]) by inva024.eu-rdc02.nxp.com (Postfix) with ESMTP id 60B13205F3; Wed, 31 Jul 2019 22:55:41 +0200 (CEST) From: Daniel Baluta To: shawnguo@kernel.org, jassisinghbrar@gmail.com Cc: s.hauer@pengutronix.de, kernel@pengutronix.de, festevam@gmail.com, linux-imx@nxp.com, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, o.rempel@pengutronix.de, Daniel Baluta Subject: [PATCH] mailbox: imx: Fix Tx doorbell shutdown path Date: Wed, 31 Jul 2019 23:55:39 +0300 Message-Id: <20190731205539.13997-1-daniel.baluta@nxp.com> X-Mailer: git-send-email 2.17.1 X-Virus-Scanned: ClamAV using ClamSMTP Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Tx doorbell is handled by txdb_tasklet and doesn't have an associated IRQ. Anyhow, imx_mu_shutdown ignores this and tries to free an IRQ that wasn't requested for Tx DB resulting in the following warning: [ 1.967644] Trying to free already-free IRQ 26 [ 1.972108] WARNING: CPU: 2 PID: 157 at kernel/irq/manage.c:1708 __free_irq+0xc0/0x358 [ 1.980024] Modules linked in: [ 1.983088] CPU: 2 PID: 157 Comm: kworker/2:1 Tainted: G [ 1.993524] Hardware name: Freescale i.MX8QXP MEK (DT) [ 1.998668] Workqueue: events deferred_probe_work_func [ 2.003812] pstate: 60000085 (nZCv daIf -PAN -UAO) [ 2.008607] pc : __free_irq+0xc0/0x358 [ 2.012364] lr : __free_irq+0xc0/0x358 [ 2.016111] sp : ffff00001179b7e0 [ 2.019422] x29: ffff00001179b7e0 x28: 0000000000000018 [ 2.024736] x27: ffff000011233000 x26: 0000000000000004 [ 2.030053] x25: 000000000000001a x24: ffff80083bec74d4 [ 2.035369] x23: 0000000000000000 x22: ffff80083bec7588 [ 2.040686] x21: ffff80083b1fe8d8 x20: ffff80083bec7400 [ 2.046003] x19: 0000000000000000 x18: ffffffffffffffff [ 2.051320] x17: 0000000000000000 x16: 0000000000000000 [ 2.056637] x15: ffff0000111296c8 x14: ffff00009179b517 [ 2.061953] x13: ffff00001179b525 x12: ffff000011142000 [ 2.067270] x11: ffff000011129f20 x10: ffff0000105da970 [ 2.072587] x9 : 00000000ffffffd0 x8 : 0000000000000194 [ 2.077903] x7 : 612065657266206f x6 : ffff0000111e7b09 [ 2.083220] x5 : 0000000000000003 x4 : 0000000000000000 [ 2.088537] x3 : 0000000000000000 x2 : 00000000ffffffff [ 2.093854] x1 : 28b70f0a2b60a500 x0 : 0000000000000000 [ 2.099173] Call trace: [ 2.101618] __free_irq+0xc0/0x358 [ 2.105021] free_irq+0x38/0x98 [ 2.108170] imx_mu_shutdown+0x90/0xb0 [ 2.111921] mbox_free_channel.part.2+0x24/0xb8 [ 2.116453] mbox_free_channel+0x18/0x28 This bug is present from the beginning of times. Cc: Oleksij Rempel Fixes: 2bb7005696e2246 ("mailbox: Add support for i.MX messaging unit") Signed-off-by: Daniel Baluta --- drivers/mailbox/imx-mailbox.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/mailbox/imx-mailbox.c b/drivers/mailbox/imx-mailbox.c index 9f74dee1a58c..957c10c4e674 100644 --- a/drivers/mailbox/imx-mailbox.c +++ b/drivers/mailbox/imx-mailbox.c @@ -214,8 +214,10 @@ static void imx_mu_shutdown(struct mbox_chan *chan) struct imx_mu_priv *priv = to_imx_mu_priv(chan->mbox); struct imx_mu_con_priv *cp = chan->con_priv; - if (cp->type == IMX_MU_TYPE_TXDB) + if (cp->type == IMX_MU_TYPE_TXDB) { tasklet_kill(&cp->txdb_tasklet); + return; + } imx_mu_xcr_rmw(priv, 0, IMX_MU_xCR_TIEn(cp->idx) | IMX_MU_xCR_RIEn(cp->idx) | IMX_MU_xCR_GIEn(cp->idx)); -- 2.17.1