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=-19.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham 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 C5E69C28CDA for ; Thu, 9 Sep 2021 13:10:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B1B24611C3 for ; Thu, 9 Sep 2021 13:10:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1358884AbhIINJx (ORCPT ); Thu, 9 Sep 2021 09:09:53 -0400 Received: from mail.kernel.org ([198.145.29.99]:42450 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1357488AbhIINBD (ORCPT ); Thu, 9 Sep 2021 09:01:03 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 635286140D; Thu, 9 Sep 2021 11:59:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1631188758; bh=j7fEjZeqNGG1BVw4z7+o9ebWYMqAA1V0g2vnqTRhNPw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=TstgKyBnJDRO41897CqYx+jcTjBbsm4xamMxOgF0aKZGfOn8ygM046iyjWeOi3Pqh BXsRBOsAyCP4sXsyWSQF2f4A2d2yPW9i6xD5b9KcP4uilglW50bPzurjDqVgU5DZkF dnqu8Zbr//lMTOLCKa5G63CxZ4aWmtduDcVtNipzpotmgAPSuRcthVeK7aaOtOj/BW IWB/oClIyp5uSiMKkBx8TgYXV/nFy7YOaVIY9tRz0nOAFZK9xYTMn1vlDyEbYzLC4X hVucA1lhLt3JYKk53KVcQ9RvBtJzVCXvrALjWWwlwJ1Y4NvwA0TLIlZMNKt3kWiOzd nDR6rKrxYwm5g== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Geert Uytterhoeven , Greg Kroah-Hartman , Sasha Levin , linux-staging@lists.linux.dev Subject: [PATCH AUTOSEL 4.14 13/59] staging: board: Fix uninitialized spinlock when attaching genpd Date: Thu, 9 Sep 2021 07:58:14 -0400 Message-Id: <20210909115900.149795-13-sashal@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210909115900.149795-1-sashal@kernel.org> References: <20210909115900.149795-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Geert Uytterhoeven [ Upstream commit df00609821bf17f50a75a446266d19adb8339d84 ] On Armadillo-800-EVA with CONFIG_DEBUG_SPINLOCK=y: BUG: spinlock bad magic on CPU#0, swapper/1 lock: lcdc0_device+0x10c/0x308, .magic: 00000000, .owner: /-1, .owner_cpu: 0 CPU: 0 PID: 1 Comm: swapper Not tainted 5.11.0-rc5-armadillo-00036-gbbca04be7a80-dirty #287 Hardware name: Generic R8A7740 (Flattened Device Tree) [] (unwind_backtrace) from [] (show_stack+0x10/0x14) [] (show_stack) from [] (do_raw_spin_lock+0x20/0x94) [] (do_raw_spin_lock) from [] (dev_pm_get_subsys_data+0x8c/0x11c) [] (dev_pm_get_subsys_data) from [] (genpd_add_device+0x78/0x2b8) [] (genpd_add_device) from [] (of_genpd_add_device+0x34/0x4c) [] (of_genpd_add_device) from [] (board_staging_register_device+0x11c/0x148) [] (board_staging_register_device) from [] (board_staging_register_devices+0x24/0x28) of_genpd_add_device() is called before platform_device_register(), as it needs to attach the genpd before the device is probed. But the spinlock is only initialized when the device is registered. Fix this by open-coding the spinlock initialization, cfr. device_pm_init_common() in the internal drivers/base code, and in the SuperH early platform code. Signed-off-by: Geert Uytterhoeven Link: https://lore.kernel.org/r/57783ece7ddae55f2bda2f59f452180bff744ea0.1626257398.git.geert+renesas@glider.be Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- drivers/staging/board/board.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/staging/board/board.c b/drivers/staging/board/board.c index 86dc41101610..1e2b33912a8a 100644 --- a/drivers/staging/board/board.c +++ b/drivers/staging/board/board.c @@ -139,6 +139,7 @@ int __init board_staging_register_clock(const struct board_staging_clk *bsc) static int board_staging_add_dev_domain(struct platform_device *pdev, const char *domain) { + struct device *dev = &pdev->dev; struct of_phandle_args pd_args; struct device_node *np; @@ -151,7 +152,11 @@ static int board_staging_add_dev_domain(struct platform_device *pdev, pd_args.np = np; pd_args.args_count = 0; - return of_genpd_add_device(&pd_args, &pdev->dev); + /* Initialization similar to device_pm_init_common() */ + spin_lock_init(&dev->power.lock); + dev->power.early_init = true; + + return of_genpd_add_device(&pd_args, dev); } #else static inline int board_staging_add_dev_domain(struct platform_device *pdev, -- 2.30.2