From patchwork Tue Aug 28 21:23:04 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jordan Crouse X-Patchwork-Id: 10579201 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id EAFCA920 for ; Tue, 28 Aug 2018 21:23:17 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id CA2522849D for ; Tue, 28 Aug 2018 21:23:12 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id BCBDA2854F; Tue, 28 Aug 2018 21:23:12 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 6DF4C2849D for ; Tue, 28 Aug 2018 21:23:12 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id C9E356E41A; Tue, 28 Aug 2018 21:23:09 +0000 (UTC) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org Received: from smtp.codeaurora.org (smtp.codeaurora.org [198.145.29.96]) by gabe.freedesktop.org (Postfix) with ESMTPS id 7D3E56E41A; Tue, 28 Aug 2018 21:23:09 +0000 (UTC) Received: by smtp.codeaurora.org (Postfix, from userid 1000) id 4415760385; Tue, 28 Aug 2018 21:23:09 +0000 (UTC) Received: from jcrouse-lnx.qualcomm.com (i-global254.qualcomm.com [199.106.103.254]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: jcrouse@smtp.codeaurora.org) by smtp.codeaurora.org (Postfix) with ESMTPSA id 20F8F60159; Tue, 28 Aug 2018 21:23:08 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 20F8F60159 From: Jordan Crouse To: freedreno@lists.freedesktop.org Subject: [PATCH] drm/msm/dpu: Remove dpu_mdss_isr when dpu_mdss_destroy is called Date: Tue, 28 Aug 2018 15:23:04 -0600 Message-Id: <20180828212304.13193-1-jcrouse@codeaurora.org> X-Mailer: git-send-email 2.18.0 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-arm-msm@vger.kernel.org, seanpaul@chromium.org, dri-devel@lists.freedesktop.org MIME-Version: 1.0 Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" X-Virus-Scanned: ClamAV using ClamSMTP The MDSS device is created before the MSM driver attempts to bind the sub components. If any of the components return -EPROBE_DEFER the MDSS device is destroyed and tried again later. If this happens the "dpu_mdss_isr" interrupt created from the DPU MDSS is not freed when the MDSS device is destroyed and has a risk of triggering later and hitting a fault by accessing a mmio region that no longer exists. Even if the interrupt isn't triggered by accident when the device attempts to reprobe it would error out when it tries to re-register the interrupt so unconditionally removing it in the destroy is the right move. Switch the device managed "dpu_mdss_isr" to be unmanaged and add a free_irq() in the mdss destroy function. Signed-off-by: Jordan Crouse Reviewed-by: Sean Paul --- drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c index 9e533b86682c..2235ef8129f4 100644 --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c @@ -158,6 +158,8 @@ static void dpu_mdss_destroy(struct drm_device *dev) _dpu_mdss_irq_domain_fini(dpu_mdss); + free_irq(platform_get_irq(pdev, 0), dpu_mdss); + msm_dss_put_clk(mp->clk_config, mp->num_clk); devm_kfree(&pdev->dev, mp->clk_config); @@ -215,7 +217,7 @@ int dpu_mdss_init(struct drm_device *dev) if (ret) goto irq_domain_error; - ret = devm_request_irq(dev->dev, platform_get_irq(pdev, 0), + ret = request_irq(platform_get_irq(pdev, 0), dpu_mdss_irq, 0, "dpu_mdss_isr", dpu_mdss); if (ret) { DPU_ERROR("failed to init irq: %d\n", ret);