From patchwork Tue Apr 26 06:02:11 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vinod Polimera X-Patchwork-Id: 12826497 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 gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id C03E3C433EF for ; Tue, 26 Apr 2022 06:02:32 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id CE4C0112553; Tue, 26 Apr 2022 06:02:31 +0000 (UTC) Received: from alexa-out.qualcomm.com (alexa-out.qualcomm.com [129.46.98.28]) by gabe.freedesktop.org (Postfix) with ESMTPS id 89064112551; Tue, 26 Apr 2022 06:02:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; i=@quicinc.com; q=dns/txt; s=qcdkim; t=1650952949; x=1682488949; h=from:to:cc:subject:date:message-id; bh=amARuMpJBWtf7g90334aANQiHnLqYqTFsIkho2bxSdw=; b=ioNcbpmRGRUNDAvs9QZfABCwuyc8w1ufrDkn520rt8TCCb9Ve9LwOSwY v5fbpzADPwyQ4kRIB/C620CVco56GgVX5VyyBOyxtDb4PKC5Ol0vygph9 vjJa8DJvdzplmNExcEv7p3TGlVcO+Mn2nR3UW1Tjd2d31qbdXuhCkI5OC I=; Received: from ironmsg09-lv.qualcomm.com ([10.47.202.153]) by alexa-out.qualcomm.com with ESMTP; 25 Apr 2022 23:02:29 -0700 X-QCInternal: smtphost Received: from ironmsg01-blr.qualcomm.com ([10.86.208.130]) by ironmsg09-lv.qualcomm.com with ESMTP/TLS/AES256-SHA; 25 Apr 2022 23:02:28 -0700 X-QCInternal: smtphost Received: from vpolimer-linux.qualcomm.com ([10.204.67.235]) by ironmsg01-blr.qualcomm.com with ESMTP; 26 Apr 2022 11:32:14 +0530 Received: by vpolimer-linux.qualcomm.com (Postfix, from userid 463814) id 91B9D55F7; Tue, 26 Apr 2022 11:32:13 +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 Subject: [PATCH] drm/msm/disp/dpu1: avoid clearing hw interrupts if hw_intr is null during drm uninit Date: Tue, 26 Apr 2022 11:32:11 +0530 Message-Id: <1650952931-31988-1-git-send-email-quic_vpolimer@quicinc.com> X-Mailer: git-send-email 2.7.4 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: quic_kalyant@quicinc.com, dianders@chromium.org, linux-kernel@vger.kernel.org, dmitry.baryshkov@linaro.org, Vinod Polimera Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Avoid clearing irqs and derefernce hw_intr when hw_intr is null. BUG: Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000 Call trace: dpu_core_irq_uninstall+0x50/0xb0 dpu_irq_uninstall+0x18/0x24 msm_drm_uninit+0xd8/0x16c msm_drm_bind+0x580/0x5fc try_to_bring_up_master+0x168/0x1c0 __component_add+0xb4/0x178 component_add+0x1c/0x28 dp_display_probe+0x38c/0x400 platform_probe+0xb0/0xd0 really_probe+0xcc/0x2c8 __driver_probe_device+0xbc/0xe8 driver_probe_device+0x48/0xf0 __device_attach_driver+0xa0/0xc8 bus_for_each_drv+0x8c/0xd8 __device_attach+0xc4/0x150 device_initial_probe+0x1c/0x28 Fixes: a73033619ea ("drm/msm/dpu: squash dpu_core_irq into dpu_hw_interrupts") Signed-off-by: Vinod Polimera --- drivers/gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.c index c515b7c..ab28577 100644 --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.c +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.c @@ -599,6 +599,9 @@ void dpu_core_irq_uninstall(struct dpu_kms *dpu_kms) { int i; + if (!dpu_kms->hw_intr) + return; + pm_runtime_get_sync(&dpu_kms->pdev->dev); for (i = 0; i < dpu_kms->hw_intr->total_irqs; i++) if (!list_empty(&dpu_kms->hw_intr->irq_cb_tbl[i]))