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=-7.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS 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 A5682C3A5A9 for ; Sat, 2 May 2020 12:32:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 833B924961 for ; Sat, 2 May 2020 12:32:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1588422774; bh=CaJB6DBVyGlr/9xAlH4HqYuo52o/ACr5ode7VcyTKvA=; h=Date:From:To:Cc:Subject:References:In-Reply-To:List-ID:From; b=2g1rIjS9vL+i81a4ToUprtb7rhq126wpl38iWmIfqWKbv00/4ps5snnj+9DEJUG3Z zy7Uwp2t+9j7IWH67lB8pQNlVjl7u5MeYgs1BMLPpLJOjG9KJngPtRB/gDJ+IZByL8 2Y/fP+2Rz9hoSaJrw5mFZsPxfmkp6Pc9eFDTau9Y= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727778AbgEBMcy (ORCPT ); Sat, 2 May 2020 08:32:54 -0400 Received: from mail.kernel.org ([198.145.29.99]:56612 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727029AbgEBMcx (ORCPT ); Sat, 2 May 2020 08:32:53 -0400 Received: from localhost (unknown [117.99.89.89]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 662812495F; Sat, 2 May 2020 12:32:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1588422772; bh=CaJB6DBVyGlr/9xAlH4HqYuo52o/ACr5ode7VcyTKvA=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=vXixllMtmdY2HFmni4yV9QnTKpN/QdjFc8YBFFPdwu3QXeTPz41oui3x5Za14SI/G wjFqi+uF7fjVKA5IBd/B1xW9PA/rD0NrrLsNkYinqE7HQZftDJmjA6e3eUWV8dITpB 7s50WwTV8A9dh7aHcZDOD5JQPD6EpnhKX/451/fA= Date: Sat, 2 May 2020 18:02:42 +0530 From: Vinod Koul To: =?utf-8?B?UmFmYcWC?= Hibner Cc: Appana Durga Kedareswara rao , Radhey Shyam Pandey , Harini Katakam , Dan Williams , Michal Simek , "open list:DMA GENERIC OFFLOAD ENGINE SUBSYSTEM" , "moderated list:ARM/ZYNQ ARCHITECTURE" , open list Subject: Re: [PATCH] dma: zynqmp_dma: Initialize descriptor list after freeing during reset Message-ID: <20200502123242.GB1375924@vkoul-mobl> References: <20200428143225.3357-1-rafal.hibner@secom.com.pl> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20200428143225.3357-1-rafal.hibner@secom.com.pl> Sender: dmaengine-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: dmaengine@vger.kernel.org Hello Rafał, On 28-04-20, 16:32, Rafał Hibner wrote: > List elements are not formally removed from list therefore > list head is not initialized during zynqmp_dma_reset. > > Signed-off-by: Rafal Hibner > > This BUG causes kernel panic when transaction is unsuccessful: > ------------[ cut here ]------------ > [ 62.710730] list_add corruption. prev->next should be next (ffffffc07d308040), but was dead000000000100. (prev=ffffffc0540b40b8). > [ 62.727960] WARNING: CPU: 0 PID: 1845 at /home/rafalh11/zynq_proj/zynq_platform/KERNEL/linux-xlnx/lib/list_debug.c:28 __list_add_valid+0x74/0xa0 > [ 62.746374] Modules linked in: secom_mx_rpmsg(O) rpmsg_char secom_mx_retune(O) ad9680(O) ad5686_spi(O) ad5686(O) ad7298(O) ltc5594(O) lmx2594(O) ad8366(O) secom_mx(O) axi_jesd204_rx(O) axi_adxcvr(O) xilinx_transceiver(O) cf_axi_adc_core(O) hmc7044(O) > [ 62.768546] CPU: 0 PID: 1845 Comm: mx Tainted: G O 4.19.0 #10 > [ 62.775582] Hardware name: xlnx,zynqmp (DT) > [ 62.779750] pstate: 60000005 (nZCv daif -PAN -UAO) > [ 62.784524] pc : __list_add_valid+0x74/0xa0 > [ 62.788690] lr : __list_add_valid+0x74/0xa0 > [ 62.792855] sp : ffffff8008003da0 > [ 62.796154] x29: ffffff8008003da0 x28: 0000000000000020 > [ 62.801457] x27: 0000000000000000 x26: dead000000000100 > [ 62.806760] x25: ffffffc07d308040 x24: ffffffc0540b40a0 > [ 62.812064] x23: ffffffc07d308018 x22: 0000000000000000 > [ 62.817359] x21: ffffffc07d308018 x20: ffffffc0540b40b8 > [ 62.822654] x19: ffffffc0540b40b8 x18: ffffffffffffffff > [ 62.827957] x17: 0000000000000000 x16: 0000000000000000 > [ 62.833252] x15: ffffff8008f88648 x14: 3034303830336437 > [ 62.838546] x13: ffffff8008f88670 x12: ffffff80085d0ec0 > [ 62.843841] x11: ffffff8008f65018 x10: 0000000000000006 > [ 62.849136] x9 : 657270202e6e6f69 x8 : 3462303435306366 > [ 62.854431] x7 : 66666666663d7665 x6 : 00000000000001a2 > [ 62.859726] x5 : 0000000000000064 x4 : 0000000000000000 > [ 62.865020] x3 : 0000000000000000 x2 : ffffffffffffffff > [ 62.870315] x1 : 0cbee765ba0ec900 x0 : 0000000000000000 > [ 62.875611] Call trace: > [ 62.878042] __list_add_valid+0x74/0xa0 > [ 62.881864] zynqmp_dma_free_descriptor+0x48/0x100 > [ 62.886644] zynqmp_dma_chan_desc_cleanup+0xb4/0xf8 > [ 62.891505] zynqmp_dma_do_tasklet+0x68/0x110 > [ 62.895847] tasklet_action_common.isra.3+0x7c/0x168 > [ 62.900801] tasklet_action+0x24/0x30 > [ 62.904447] __do_softirq+0x10c/0x200 > [ 62.908092] irq_exit+0xac/0xc0 > [ 62.911219] __handle_domain_irq+0x60/0xb0 > [ 62.915305] gic_handle_irq+0x64/0xc0 > [ 62.918951] el1_irq+0xb0/0x140 > [ 62.922078] schedule_timeout+0x218/0x3a0 > [ 62.926077] wait_for_common+0x170/0x268 > [ 62.929983] wait_for_completion_timeout+0x10/0x18 > [ 62.934761] ioctl+0x64/0x270 [secom_mx_retune] > [ 62.939281] do_vfs_ioctl+0xb8/0x900 > [ 62.942838] ksys_ioctl+0x44/0x90 > [ 62.946137] __arm64_sys_ioctl+0x1c/0x28 > [ 62.950044] el0_svc_common+0x60/0xe8 > [ 62.953689] el0_svc_handler+0x6c/0x88 > [ 62.957421] el0_svc+0x8/0xc > [ 62.960284] ---[ end trace 91b4fdfe685446c4 ]--- > [ 62.964934] ------------[ cut here ]------------ > > --- > drivers/dma/xilinx/zynqmp_dma.c | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/drivers/dma/xilinx/zynqmp_dma.c b/drivers/dma/xilinx/zynqmp_dma.c > index 931e41a72..a2b0be07e 100644 > --- a/drivers/dma/xilinx/zynqmp_dma.c > +++ b/drivers/dma/xilinx/zynqmp_dma.c > @@ -453,6 +453,7 @@ static void zynqmp_dma_free_desc_list(struct zynqmp_dma_chan *chan, > > list_for_each_entry_safe(desc, next, list, node) > zynqmp_dma_free_descriptor(chan, desc); > + INIT_LIST_HEAD(list); Would it not be better to use list_del_init() where we delete it rather than do the init here? Thanks -- ~Vinod 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=-7.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED 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 D6635C3A5A9 for ; Sat, 2 May 2020 12:32:58 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id A73D324965 for ; Sat, 2 May 2020 12:32:58 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org 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DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1588422772; bh=CaJB6DBVyGlr/9xAlH4HqYuo52o/ACr5ode7VcyTKvA=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=vXixllMtmdY2HFmni4yV9QnTKpN/QdjFc8YBFFPdwu3QXeTPz41oui3x5Za14SI/G wjFqi+uF7fjVKA5IBd/B1xW9PA/rD0NrrLsNkYinqE7HQZftDJmjA6e3eUWV8dITpB 7s50WwTV8A9dh7aHcZDOD5JQPD6EpnhKX/451/fA= Date: Sat, 2 May 2020 18:02:42 +0530 From: Vinod Koul To: =?utf-8?B?UmFmYcWC?= Hibner Subject: Re: [PATCH] dma: zynqmp_dma: Initialize descriptor list after freeing during reset Message-ID: <20200502123242.GB1375924@vkoul-mobl> References: <20200428143225.3357-1-rafal.hibner@secom.com.pl> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200428143225.3357-1-rafal.hibner@secom.com.pl> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200502_053255_028225_C353DE87 X-CRM114-Status: GOOD ( 14.88 ) X-BeenThere: linux-arm-kernel@lists.infradead.org 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