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=-9.8 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS autolearn=unavailable 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 121B5C433E5 for ; Mon, 20 Jul 2020 13:02:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E11D1207FC for ; Mon, 20 Jul 2020 13:02:36 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=mg.codeaurora.org header.i=@mg.codeaurora.org header.b="j7zb1wkI" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728272AbgGTNCf (ORCPT ); Mon, 20 Jul 2020 09:02:35 -0400 Received: from m43-7.mailgun.net ([69.72.43.7]:16962 "EHLO m43-7.mailgun.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728001AbgGTNCe (ORCPT ); Mon, 20 Jul 2020 09:02:34 -0400 DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1595250154; h=Message-ID: References: In-Reply-To: Subject: Cc: To: From: Date: Content-Transfer-Encoding: Content-Type: MIME-Version: Sender; bh=+8B2VUGhaduI3uJTC0qKLOS8vpqrG5yTlP23NYTVMv4=; b=j7zb1wkI+3HWozG03MfGbLeeojpaAffmjJg8rF+Riyu3L/YTOOAAIw3VikBgfVpuuq/wdDps MYHyx2aoOsZGtpqzuZKNFxQDfEM+t8raowU23Xl03uIy9OIwKJqBLZsdypoIpn9Iqn52Ywzw 9s0ttZ1cRNXmDQeVHUe3vKzwKVo= X-Mailgun-Sending-Ip: 69.72.43.7 X-Mailgun-Sid: WyI0MWYwYSIsICJsaW51eC1rZXJuZWxAdmdlci5rZXJuZWwub3JnIiwgImJlOWU0YSJd Received: from smtp.codeaurora.org (ec2-35-166-182-171.us-west-2.compute.amazonaws.com [35.166.182.171]) by smtp-out-n12.prod.us-west-2.postgun.com with SMTP id 5f1594d00cb8533c3bcf5b0a (version=TLS1.2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256); Mon, 20 Jul 2020 12:57:52 GMT Received: by smtp.codeaurora.org (Postfix, from userid 1001) id E6F32C433CB; Mon, 20 Jul 2020 12:57:51 +0000 (UTC) Received: from mail.codeaurora.org (localhost.localdomain [127.0.0.1]) (using TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) (Authenticated sender: saiprakash.ranjan) by smtp.codeaurora.org (Postfix) with ESMTPSA id 01AF3C433C6; Mon, 20 Jul 2020 12:57:50 +0000 (UTC) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII; format=flowed Content-Transfer-Encoding: 7bit Date: Mon, 20 Jul 2020 18:27:50 +0530 From: Sai Prakash Ranjan To: Rajendra Nayak Cc: robdclark@gmail.com, sean@poorly.run, linux-arm-msm@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, linux-arm-msm-owner@vger.kernel.org Subject: Re: [PATCH] drm/msm/dpu: dev_pm_opp_put_clkname() only when an opp_table exists In-Reply-To: <1595247476-12968-1-git-send-email-rnayak@codeaurora.org> References: <1595247476-12968-1-git-send-email-rnayak@codeaurora.org> Message-ID: X-Sender: saiprakash.ranjan@codeaurora.org User-Agent: Roundcube Webmail/1.3.9 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2020-07-20 17:47, Rajendra Nayak wrote: > Its possible that dpu_bind() fails early enough before > dev_pm_opp_set_clkname() is called. In such cases, unconditionally > calling dev_pm_opp_put_clkname() in dpu_unbind() can result in > a crash. Put an additional check so that dev_pm_opp_put_clkname() > is called only when an opp_table exists. > > Fixes: aa3950767d05 ("drm/msm/dpu: Use OPP API to set clk/perf state") > Signed-off-by: Rajendra Nayak > --- > drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c > b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c > index f2bbce4..843a1c1 100644 > --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c > +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c > @@ -1079,7 +1079,8 @@ static void dpu_unbind(struct device *dev, > struct device *master, void *data) > > if (dpu_kms->has_opp_table) > dev_pm_opp_of_remove_table(dev); > - dev_pm_opp_put_clkname(dpu_kms->opp_table); > + if (dpu_kms->opp_table) > + dev_pm_opp_put_clkname(dpu_kms->opp_table); > } > > static const struct component_ops dpu_ops = { Tested-by: Sai Prakash Ranjan -- QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation