From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 79B241C701E; Wed, 19 Feb 2025 08:56:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1739955409; cv=none; b=Z/hZwHiqygNXhp33Wde1bnNvoVr+FjJoE//x4aITOjfjnhzNfRy2SdN1nmrrmROI0474zSrHsGu9jhoV0WIrOKNJ0trIo19fF09BxBklT1RT0ImGoSr4w0Xg+WWHvqPN8GALGMrZ33znpFidmfmgMLqWYWCtcljmlsE4Ae9rEHQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1739955409; c=relaxed/simple; bh=i/8Ej01UNuCu+4YD3PP3jR2UGVc/qmYlFnwS/lYXULU=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=O5dnfFNe8kT0MMtmWISq89cyGsw5aYikY6/vD+YJgQEsYY2rQhesRDk5MPBLskmMFps/xmZUSW/TlBFb/qcYwNjE4x0tJB/1sqVONLRw6dqJOx8Jn3PD4zZ1D20MuHgl8It1LJ1UM1G550KSevFcK5i7YbVRnxhQbATxfa2+VhE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=DdU3YA8H; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="DdU3YA8H" Received: by smtp.kernel.org (Postfix) with ESMTPSA id ECF03C4CED1; Wed, 19 Feb 2025 08:56:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1739955409; bh=i/8Ej01UNuCu+4YD3PP3jR2UGVc/qmYlFnwS/lYXULU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=DdU3YA8HKa4gFcSKNEFY+GwDh1I2r3T1NEMd9bN9uMKsUnSksH9H+2Pu6XOqBttBZ 6fN1eSXErmMug0nO8KA+j04TWrG7fOw3iVDYZtA+4Ej0iLm4jyVxrGdq8oK1btV+3D mcMuOHJG/jK7gbdr3c0vAPxO7sYK40yDQ4dopWsI= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Dmitry Baryshkov , Geert Uytterhoeven , Avri Altman , Bean Huo , Bart Van Assche , "Martin K. Petersen" Subject: [PATCH 6.12 226/230] scsi: ufs: core: Ensure clk_gating.lock is used only after initialization Date: Wed, 19 Feb 2025 09:29:03 +0100 Message-ID: <20250219082610.526209305@linuxfoundation.org> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20250219082601.683263930@linuxfoundation.org> References: <20250219082601.683263930@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Avri Altman commit 3d4114a1d34413dfffa0094c2eb7b95e61087abd upstream. Address a lockdep warning triggered by the use of the clk_gating.lock before it is properly initialized. The warning is as follows: [ 4.388838] INFO: trying to register non-static key. [ 4.395673] The code is fine but needs lockdep annotation, or maybe [ 4.402118] you didn't initialize this object before use? [ 4.407673] turning off the locking correctness validator. [ 4.413334] CPU: 5 UID: 0 PID: 58 Comm: kworker/u32:1 Not tainted 6.12-rc1 #185 [ 4.413343] Hardware name: Qualcomm Technologies, Inc. Robotics RB5 (DT) [ 4.413362] Call trace: [ 4.413364] show_stack+0x18/0x24 (C) [ 4.413374] dump_stack_lvl+0x90/0xd0 [ 4.413384] dump_stack+0x18/0x24 [ 4.413392] register_lock_class+0x498/0x4a8 [ 4.413400] __lock_acquire+0xb4/0x1b90 [ 4.413406] lock_acquire+0x114/0x310 [ 4.413413] _raw_spin_lock_irqsave+0x60/0x88 [ 4.413423] ufshcd_setup_clocks+0x2c0/0x490 [ 4.413433] ufshcd_init+0x198/0x10ec [ 4.413437] ufshcd_pltfrm_init+0x600/0x7c0 [ 4.413444] ufs_qcom_probe+0x20/0x58 [ 4.413449] platform_probe+0x68/0xd8 [ 4.413459] really_probe+0xbc/0x268 [ 4.413466] __driver_probe_device+0x78/0x12c [ 4.413473] driver_probe_device+0x40/0x11c [ 4.413481] __device_attach_driver+0xb8/0xf8 [ 4.413489] bus_for_each_drv+0x84/0xe4 [ 4.413495] __device_attach+0xfc/0x18c [ 4.413502] device_initial_probe+0x14/0x20 [ 4.413510] bus_probe_device+0xb0/0xb4 [ 4.413517] deferred_probe_work_func+0x8c/0xc8 [ 4.413524] process_scheduled_works+0x250/0x658 [ 4.413534] worker_thread+0x15c/0x2c8 [ 4.413542] kthread+0x134/0x200 [ 4.413550] ret_from_fork+0x10/0x20 To fix this issue, ensure that the spinlock is only used after it has been properly initialized before using it in ufshcd_setup_clocks(). Do that unconditionally as initializing a spinlock is a fast operation. Fixes: 209f4e43b806 ("scsi: ufs: core: Introduce a new clock_gating lock") Reported-by: Dmitry Baryshkov Tested-by: Geert Uytterhoeven Signed-off-by: Avri Altman Link: https://lore.kernel.org/r/20250128071207.75494-2-avri.altman@wdc.com Reviewed-by: Bean Huo Reviewed-by: Bart Van Assche Signed-off-by: Martin K. Petersen Signed-off-by: Greg Kroah-Hartman --- drivers/ufs/core/ufshcd.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) --- a/drivers/ufs/core/ufshcd.c +++ b/drivers/ufs/core/ufshcd.c @@ -2150,8 +2150,6 @@ static void ufshcd_init_clk_gating(struc INIT_DELAYED_WORK(&hba->clk_gating.gate_work, ufshcd_gate_work); INIT_WORK(&hba->clk_gating.ungate_work, ufshcd_ungate_work); - spin_lock_init(&hba->clk_gating.lock); - hba->clk_gating.clk_gating_workq = alloc_ordered_workqueue( "ufs_clk_gating_%d", WQ_MEM_RECLAIM | WQ_HIGHPRI, hba->host->host_no); @@ -10453,6 +10451,12 @@ int ufshcd_init(struct ufs_hba *hba, voi hba->irq = irq; hba->vps = &ufs_hba_vps; + /* + * Initialize clk_gating.lock early since it is being used in + * ufshcd_setup_clocks() + */ + spin_lock_init(&hba->clk_gating.lock); + err = ufshcd_hba_init(hba); if (err) goto out_error;