From patchwork Mon Sep 1 17:07:33 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Russell King X-Patchwork-Id: 4822411 Return-Path: X-Original-To: patchwork-dri-devel@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id B1FC6C0338 for ; Tue, 2 Sep 2014 01:00:11 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id CA45F20170 for ; Tue, 2 Sep 2014 01:00:10 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) by mail.kernel.org (Postfix) with ESMTP id 6EFDC2017E for ; Tue, 2 Sep 2014 01:00:09 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id F2F506E3F7; Mon, 1 Sep 2014 18:00:03 -0700 (PDT) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org Received: from pandora.arm.linux.org.uk (gw-1.arm.linux.org.uk [78.32.30.217]) by gabe.freedesktop.org (Postfix) with ESMTP id 55A986E049 for ; Mon, 1 Sep 2014 10:07:36 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=arm.linux.org.uk; s=pandora-2014; h=Date:Sender:Message-Id:Content-Type:Content-Transfer-Encoding:MIME-Version:Subject:Cc:To:From:References:In-Reply-To; bh=WsgaJqGVt8C8D/WjLrJxIijI7e4cGN2/I0uqDVeOl8s=; b=YormVuvGUNirjEigWrtVY64iyKq0EcL6anVkAjPekELQfjXSlCwdFYt0n6OwFHjg3jYOKb0IIC/D+adb0xDX+36fAlQ0CEk3kJUyyQCxWB76p611W6UHaNYbe0fGVj9URB6N1Eybx7EwuFEClkhVD3oA7KOlzAK7kbj/7Zu50ow=; Received: from e0022681537dd.dyn.arm.linux.org.uk ([2001:4d48:ad52:3201:222:68ff:fe15:37dd]:52792 helo=rmk-PC.arm.linux.org.uk) by pandora.arm.linux.org.uk with esmtpsa (TLSv1:DHE-RSA-AES256-SHA:256) (Exim 4.82_1-5b7a7c0-XX) (envelope-from ) id 1XOV4o-0004JO-Na; Mon, 01 Sep 2014 18:07:34 +0100 Received: from rmk by rmk-PC.arm.linux.org.uk with local (Exim 4.76) (envelope-from ) id 1XOV4n-0004fb-By; Mon, 01 Sep 2014 18:07:33 +0100 In-Reply-To: <20140901170712.GJ30401@n2100.arm.linux.org.uk> References: <20140901170712.GJ30401@n2100.arm.linux.org.uk> From: Russell King To: Greg Kroah-Hartman Subject: [PATCH 1/2] imx-drm: ipuv3-plane: fix ipu_plane_dpms() MIME-Version: 1.0 Content-Disposition: inline Message-Id: Date: Mon, 01 Sep 2014 18:07:33 +0100 X-Mailman-Approved-At: Mon, 01 Sep 2014 18:00:03 -0700 Cc: linux-arm-kernel@lists.infradead.org, devel@driverdev.osuosl.org, dri-devel@lists.freedesktop.org, Shawn Guo X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" X-Spam-Status: No, score=-5.7 required=5.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_MED,RP_MATCHES_RCVD,T_DKIM_INVALID,UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP When unbinding imx-drm, the following oops was observed: Unable to handle kernel NULL pointer dereference at virtual address 00000004 pgd = e995c000 [00000004] *pgd=4fea5831 Internal error: Oops: 817 [#1] SMP ARM Modules linked in: bnep rfcomm bluetooth nfsd exportfs hid_cypress brcmfmac brcmutil snd_soc_fsl_ssi snd_soc_fsl_spdif imx_pcm_fiq imx_pcm_dma snd_soc_sgtl5000 imx_sdma imx2_wdt imx_ldb(C) imx_thermal snd_soc_imx_sgtl5000 snd_soc_imx_spdif snd_soc_imx_audmux CPU: 1 PID: 779 Comm: bash Tainted: G C 3.16.0-rc2+ #1230 task: ea9eb180 ti: ea378000 task.ti: ea378000 PC is at ipu_dp_put+0x10/0x18 LR is at ipu_plane_dpms+0x60/0x8c pc : [] lr : [] psr: 200f0013 sp : ea379d80 ip : ea379d90 fp : ea379d8c r10: 00100100 r9 : 00000000 r8 : 00200200 r7 : e9ba0264 r6 : e9ba01f8 r5 : 00000000 r4 : ea34b800 r3 : 00000000 r2 : 00000000 r1 : 0000009b r0 : 00000000 Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 10c53c7d Table: 3995c04a DAC: 00000015 Process bash (pid: 779, stack limit = 0xea378240) Stack: (0xea379d80 to 0xea37a000) ... Backtrace: [] (ipu_dp_put) from [] (ipu_plane_dpms+0x60/0x8c) [] (ipu_plane_dpms) from [] (ipu_disable_plane+0x2c/0x60) [] (ipu_disable_plane) from [] (ipu_plane_destroy+0x28/0x60) [] (ipu_plane_destroy) from [] (drm_mode_config_cleanup+0x1b8/0x250) [] (drm_mode_config_cleanup) from [] (imx_drm_driver_unload+0x44/0x4c) [] (imx_drm_driver_unload) from [] (drm_dev_unregister+0x2c/0xa0) [] (drm_dev_unregister) from [] (drm_put_dev+0x30/0x6c) [] (drm_put_dev) from [] (imx_drm_unbind+0x14/0x18) [] (imx_drm_unbind) from [] (component_master_del+0xbc/0xd8) ... Code: e1a0c00d e92dd800 e24cb004 e3a03000 (e5c03004) This is caused by a missing check in ipu_plane_dpms for a NULL pointer. Fixes: b8d181e408af ("staging: drm/imx: add drm plane support") Cc: Signed-off-by: Russell King --- drivers/staging/imx-drm/ipuv3-plane.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/staging/imx-drm/ipuv3-plane.c b/drivers/staging/imx-drm/ipuv3-plane.c index 6f393a11f44d..50de10a550e9 100644 --- a/drivers/staging/imx-drm/ipuv3-plane.c +++ b/drivers/staging/imx-drm/ipuv3-plane.c @@ -281,7 +281,8 @@ static void ipu_plane_dpms(struct ipu_plane *ipu_plane, int mode) ipu_idmac_put(ipu_plane->ipu_ch); ipu_dmfc_put(ipu_plane->dmfc); - ipu_dp_put(ipu_plane->dp); + if (ipu_plane->dp) + ipu_dp_put(ipu_plane->dp); } }