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 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4FD92C433F5 for ; Thu, 21 Oct 2021 21:44:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3BC6B6135E for ; Thu, 21 Oct 2021 21:44:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232277AbhJUVqa (ORCPT ); Thu, 21 Oct 2021 17:46:30 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55192 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232213AbhJUVq1 (ORCPT ); Thu, 21 Oct 2021 17:46:27 -0400 Received: from mail-wr1-x42d.google.com (mail-wr1-x42d.google.com [IPv6:2a00:1450:4864:20::42d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 659DAC061764 for ; Thu, 21 Oct 2021 14:44:11 -0700 (PDT) Received: by mail-wr1-x42d.google.com with SMTP id k7so1572264wrd.13 for ; Thu, 21 Oct 2021 14:44:11 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=eYXk6mu1t2LWygmapm0MdeihIPOCQMZuJBpibJeSFrg=; b=pipLd9DaH9X9ot+mnSW7A9glsVMiXNt8jyPO6ryvQPeufIgoWxUTYpO5pxiziBFTiw /wfs81v1wfp5uuD964VhdPODilAzmvCRV/hvVnKdcV+oyYSYbKDeN6VgYEsVeo6fV516 zayL5cnKNaw3D/H1Vvtr7J1vallwZTvTuE7uBUTuERitc6IGcm5etPkAMVbp9UOK10hr bPKZP+BmkXhVI9ypnjyCSMGFlFDG8Lq+yB+FIcwdgRuuMihAWuwVHiBy/KpbRui/iSij tuTdZoOnGDFCddH8+2WpV7XXlq09e+BE9ACwihiJonKhGBkhuqVdxbNkimJQV5O4jY9k 6AlA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=eYXk6mu1t2LWygmapm0MdeihIPOCQMZuJBpibJeSFrg=; b=3B8Gcrs7G+/fsig076X1flLuxWTDQZ89KAT5/KyTDSqwr49xZST4OGu/rpM0KuW4LD gwElWJSjT+kfmdnaXYfaey6SosMkWmM1kV73Cg0p5wdBrSB+qY5DfYQ0H2/h2Hrr8J2t UhMVMj1XgHtsgOGoRmu2Wkhx881eKFgHLRiUiuNaP8GlTIfnr12mHIHCj2GtDcXxXzBY RP/kZ1ZehlZA4EvRZdE/2IAxL+uPy85S/sg14sCF8fBYZs9A+QvB2QVZS5DE9z4NJQZU y7ohVLQRc4ZemAGqTwczgOAweMC7ty/m04fw5Gzlg/q1SPxLLOtTdhulOcJ7yLS5GBb4 UB2g== X-Gm-Message-State: AOAM5312X8v/X9t6+3wBxHI9EaGSQeTSE/m6BgrulAW74mzEcwLFprB8 RVvjm28WrhpS+0PMINdLC7xWKSb/GAA= X-Google-Smtp-Source: ABdhPJwgPGAP5hFSP4iGuCwPIy0Br+h5i0piF24KZGoZ418Y4BJRsZaQgpqSb/QkgoOMR0hSjqK5tw== X-Received: by 2002:adf:b350:: with SMTP id k16mr10436592wrd.368.1634852650001; Thu, 21 Oct 2021 14:44:10 -0700 (PDT) Received: from localhost.localdomain (cpc141996-chfd3-2-0-cust928.12-3.cable.virginm.net. [86.13.91.161]) by smtp.gmail.com with ESMTPSA id r205sm6378507wma.3.2021.10.21.14.44.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 21 Oct 2021 14:44:09 -0700 (PDT) From: Daniel Scally To: linux-media@vger.kernel.org, paul.kocialkowski@bootlin.com Cc: Yong Zhi , Sakari Ailus , Bingbu Cao , Dan Scally , Tianshu Qiu , Andy Shevchenko , hdegoede@redhat.com, laurent.pinchart@ideasonboard.com, kieran.bingham@ideasonboard.com Subject: [PATCH v3 16/16] media: i2c: ov8865: Fix lockdep error Date: Thu, 21 Oct 2021 22:43:31 +0100 Message-Id: <20211021214331.1188787-17-djrscally@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20211021214331.1188787-1-djrscally@gmail.com> References: <20211021214331.1188787-1-djrscally@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org From: Hans de Goede ov8865_state_init() calls ov8865_state_mipi_configure() which uses __v4l2_ctrl_s_ctrl[_int64](). This means that sensor->mutex (which is also sensor->ctrls.handler.lock) must be locked before calling ov8865_state_init(). Note ov8865_state_mipi_configure() is also used in other places where the lock is already held so it cannot be changed itself. This fixes the following lockdep kernel WARN: [ 13.233413] ------------[ cut here ]------------ [ 13.233421] WARNING: CPU: 0 PID: 8 at drivers/media/v4l2-core/v4l2-ctrls-api.c:833 __v4l2_ctrl_s_ctrl+0x4d/0x60 [videodev] ... [ 13.234063] Call Trace: [ 13.234074] ov8865_state_configure+0x98b/0xc00 [ov8865] [ 13.234095] ov8865_probe+0x4b1/0x54c [ov8865] [ 13.234117] i2c_device_probe+0x13c/0x2d0 Signed-off-by: Hans de Goede --- Changes in v3: - New patch fixing a problem Hans noticed - thank you! drivers/media/i2c/ov8865.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/media/i2c/ov8865.c b/drivers/media/i2c/ov8865.c index 685539744041..27179f1d5cb8 100644 --- a/drivers/media/i2c/ov8865.c +++ b/drivers/media/i2c/ov8865.c @@ -3073,7 +3073,9 @@ static int ov8865_probe(struct i2c_client *client) if (ret) goto error_mutex; + mutex_lock(&sensor->mutex); ret = ov8865_state_init(sensor); + mutex_unlock(&sensor->mutex); if (ret) goto error_ctrls; -- 2.25.1