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[2620:137:e000::1:20]) by mx.google.com with ESMTP id cr15-20020a170906d54f00b007982c5e6ec8si11949493ejc.89.2022.10.24.01.02.52; Mon, 24 Oct 2022 01:03:19 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@linaro.org header.s=google header.b=CMfk1o4O; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linaro.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229802AbiJXHyS (ORCPT + 99 others); Mon, 24 Oct 2022 03:54:18 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40842 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229587AbiJXHyQ (ORCPT ); Mon, 24 Oct 2022 03:54:16 -0400 Received: from mail-ed1-x533.google.com (mail-ed1-x533.google.com [IPv6:2a00:1450:4864:20::533]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 09658558C4 for ; Mon, 24 Oct 2022 00:54:12 -0700 (PDT) Received: by mail-ed1-x533.google.com with SMTP id x2so816157edd.2 for ; Mon, 24 Oct 2022 00:54:11 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:from:to:cc:subject:date:message-id:reply-to; bh=np2MboBXPdpCjk4yE/v8jv8Cr7DEE4vCXR9aVi6NMuQ=; b=CMfk1o4OzpbnoEvbhSyBTJsc/lrFji4JSwldqbnj0/xw470NWf7R+wmCYUepa+ANkJ 5CeKo+mBrV14/fFMP8oBwYEsPOFmx0WtYZpdB4J3MFuHO2oyRtloK7Z7tkh/cC1UdlpZ c7a6zfTprLyLbJmyuI5W0tu6AGhJtfxkY6J3ihr1hhZq4NUoHfG0jKZPbqLU2/mFLCog c8nfgJncBPWcxcmDo0iowNsBIaBfTau0X7FrfJ/uM8g0rNHwu5NxkETe2Hj/euYNdwaU t7iXge1x2pLZqxc29oeANjgRIAa7iPWvIBDoRUqShLblruOgKxIodgqvYcacLKeIg/hN 0wmg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=np2MboBXPdpCjk4yE/v8jv8Cr7DEE4vCXR9aVi6NMuQ=; b=NmwoKIwP4xH1cs+t2jymv/jtpighyiJII8Lz5bpdHE+FeHsmO6VyegjLAvJyC3K653 dVj/QzL0kP0sz26rbIPvlzxvUwLlq99ZCMRjnjr15/ap+/caYgeiJNGOuuljAWh4InEv dZCv1/a7VhL8xsUKqLDQl6N/osvrJqTrKgAl268r2Cj5j5zvlW8QyEP6bcT0lD50VG1q nE5rfsfyspmKpYMLN4dEZKjUWAZoHNwI9abRyrv3MCk9XWGHji0vkoH8XVtmTjSroNAa DXusEUdMfLPFYDEG3uc3orKJNOH5K0mA4UC+5toPk7GMGghPGokgNTZykWK1zzuin0AB QC8A== X-Gm-Message-State: ACrzQf2jLM2wWC7ZTgmbUD03DZZFCiYatPt/Q67vsxDTYDbdOORdQv5x 1qvyaw4Km4Iro7TT2A9TPVTQgQiTB9vc4uwgu22CUQ== X-Received: by 2002:aa7:c792:0:b0:453:98b7:213c with SMTP id n18-20020aa7c792000000b0045398b7213cmr29135252eds.159.1666598050510; Mon, 24 Oct 2022 00:54:10 -0700 (PDT) MIME-Version: 1.0 References: <20221013110411.1674359-1-treapking@chromium.org> <20221013110411.1674359-2-treapking@chromium.org> In-Reply-To: <20221013110411.1674359-2-treapking@chromium.org> From: Robert Foss Date: Mon, 24 Oct 2022 09:53:59 +0200 Message-ID: Subject: Re: [PATCH v2 1/3] drm/bridge: it6505: Initialize AUX channel in it6505_i2c_probe To: Pin-yen Lin Cc: Andrzej Hajda , Neil Armstrong , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , David Airlie , Daniel Vetter , Allen Chen , AngeloGioacchino Del Regno , Hermes Wu , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org Content-Type: text/plain; charset="UTF-8" X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, 13 Oct 2022 at 13:04, Pin-yen Lin wrote: > > During device boot, the HPD interrupt could be triggered before the DRM > subsystem registers it6505 as a DRM bridge. In such cases, the driver > tries to access AUX channel and causes NULL pointer dereference. > Initializing the AUX channel earlier to prevent such error. > > Fixes: b5c84a9edcd4 ("drm/bridge: add it6505 driver") > Signed-off-by: Pin-yen Lin > --- > > (no changes since v1) > > drivers/gpu/drm/bridge/ite-it6505.c | 8 +++++--- > 1 file changed, 5 insertions(+), 3 deletions(-) > > diff --git a/drivers/gpu/drm/bridge/ite-it6505.c b/drivers/gpu/drm/bridge/ite-it6505.c > index a4302492cf8d..f7f6c3e20fae 100644 > --- a/drivers/gpu/drm/bridge/ite-it6505.c > +++ b/drivers/gpu/drm/bridge/ite-it6505.c > @@ -2871,10 +2871,7 @@ static int it6505_bridge_attach(struct drm_bridge *bridge, > } > > /* Register aux channel */ > - it6505->aux.name = "DP-AUX"; > - it6505->aux.dev = dev; > it6505->aux.drm_dev = bridge->dev; > - it6505->aux.transfer = it6505_aux_transfer; > > ret = drm_dp_aux_register(&it6505->aux); > > @@ -3354,6 +3351,11 @@ static int it6505_i2c_probe(struct i2c_client *client, > debugfs_init(it6505); > pm_runtime_enable(dev); > > + it6505->aux.name = "DP-AUX"; > + it6505->aux.dev = dev; > + it6505->aux.transfer = it6505_aux_transfer; > + drm_dp_aux_init(&it6505->aux); > + > it6505->bridge.funcs = &it6505_bridge_funcs; > it6505->bridge.type = DRM_MODE_CONNECTOR_DisplayPort; > it6505->bridge.ops = DRM_BRIDGE_OP_DETECT | DRM_BRIDGE_OP_EDID | > -- > 2.38.0.rc1.362.ged0d419d3c-goog > Reviewed-by: Robert Foss