From patchwork Fri Jun 3 09:22:47 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vinod Polimera X-Patchwork-Id: 578540 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 1DD86C43334 for ; Fri, 3 Jun 2022 09:23:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239309AbiFCJXJ (ORCPT ); Fri, 3 Jun 2022 05:23:09 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35440 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S243003AbiFCJXG (ORCPT ); Fri, 3 Jun 2022 05:23:06 -0400 Received: from alexa-out.qualcomm.com (alexa-out.qualcomm.com [129.46.98.28]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 35FB42715B; Fri, 3 Jun 2022 02:23:05 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; i=@quicinc.com; q=dns/txt; s=qcdkim; t=1654248185; x=1685784185; h=from:to:cc:subject:date:message-id; bh=V2lKivc9M3T8itEYOlhL4nuspF06rOXNkuFJ8fsnkqw=; b=dVINiMNdBylF+G5YX0Sc2ZU4c/oHSVgGVW04BXhsC8fgEPQfz76KvnWl VWWft3xds0Mi1ru9U7XpzwkQFTq+D39afbaUzNUZFxlTCAC+8ulYuyin0 YKG8FUJXGeAQftAHoxk1uQWxZjiRvWIbkYinynh/0+jgGu8XaUzOfVawS k=; Received: from ironmsg09-lv.qualcomm.com ([10.47.202.153]) by alexa-out.qualcomm.com with ESMTP; 03 Jun 2022 02:23:05 -0700 X-QCInternal: smtphost Received: from ironmsg02-blr.qualcomm.com ([10.86.208.131]) by ironmsg09-lv.qualcomm.com with ESMTP/TLS/AES256-SHA; 03 Jun 2022 02:23:03 -0700 X-QCInternal: smtphost Received: from vpolimer-linux.qualcomm.com ([10.204.67.235]) by ironmsg02-blr.qualcomm.com with ESMTP; 03 Jun 2022 14:52:50 +0530 Received: by vpolimer-linux.qualcomm.com (Postfix, from userid 463814) id 680753A0D; Fri, 3 Jun 2022 14:52:49 +0530 (IST) From: Vinod Polimera To: dri-devel@lists.freedesktop.org, linux-arm-msm@vger.kernel.org, freedreno@lists.freedesktop.org, devicetree@vger.kernel.org Cc: Vinod Polimera , linux-kernel@vger.kernel.org, robdclark@gmail.com, dianders@chromium.org, vpolimer@quicinc.com, swboyd@chromium.org, kalyant@quicinc.com, dmitry.baryshkov@linaro.org Subject: [v1] drm/msm: add null checks for drm device to avoid crash during probe defer Date: Fri, 3 Jun 2022 14:52:47 +0530 Message-Id: <1654248167-10594-1-git-send-email-quic_vpolimer@quicinc.com> X-Mailer: git-send-email 2.7.4 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org During probe defer, drm device is not initialized and an external trigger to shutdown is trying to clean up drm device leading to crash. Add checks to avoid drm device cleanup in such cases. BUG: unable to handle kernel NULL pointer dereference at virtual address 00000000000000b8 Call trace: drm_atomic_helper_shutdown+0x44/0x144 msm_pdev_shutdown+0x2c/0x38 platform_shutdown+0x2c/0x38 device_shutdown+0x158/0x210 kernel_restart_prepare+0x40/0x4c kernel_restart+0x20/0x6c __arm64_sys_reboot+0x194/0x23c invoke_syscall+0x50/0x13c el0_svc_common+0xa0/0x17c do_el0_svc_compat+0x28/0x34 el0_svc_compat+0x20/0x70 el0t_32_sync_handler+0xa8/0xcc el0t_32_sync+0x1a8/0x1ac Signed-off-by: Vinod Polimera --- drivers/gpu/drm/msm/msm_drv.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c index 4448536..d62ac66 100644 --- a/drivers/gpu/drm/msm/msm_drv.c +++ b/drivers/gpu/drm/msm/msm_drv.c @@ -142,6 +142,9 @@ static void msm_irq_uninstall(struct drm_device *dev) struct msm_drm_private *priv = dev->dev_private; struct msm_kms *kms = priv->kms; + if (!irq_has_action(kms->irq)) + return; + kms->funcs->irq_uninstall(kms); if (kms->irq_requested) free_irq(kms->irq, dev); @@ -259,6 +262,7 @@ static int msm_drm_uninit(struct device *dev) ddev->dev_private = NULL; drm_dev_put(ddev); + priv->dev = NULL; destroy_workqueue(priv->wq); @@ -1167,7 +1171,7 @@ void msm_drv_shutdown(struct platform_device *pdev) struct msm_drm_private *priv = platform_get_drvdata(pdev); struct drm_device *drm = priv ? priv->dev : NULL; - if (!priv || !priv->kms) + if (!priv || !priv->kms || !drm) return; drm_atomic_helper_shutdown(drm);