From patchwork Tue Sep 19 13:37:28 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "H. Nikolaus Schaller" X-Patchwork-Id: 13391471 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 gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id C8B57CD5BC0 for ; Tue, 19 Sep 2023 13:38:17 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 4179110E266; Tue, 19 Sep 2023 13:38:17 +0000 (UTC) Received: from mo4-p01-ob.smtp.rzone.de (mo4-p01-ob.smtp.rzone.de [85.215.255.54]) by gabe.freedesktop.org (Postfix) with ESMTPS id BF3FE10E266 for ; Tue, 19 Sep 2023 13:38:14 +0000 (UTC) ARC-Seal: i=1; a=rsa-sha256; t=1695130657; cv=none; d=strato.com; s=strato-dkim-0002; b=fmNCdrliKmKlDo9QFTbljpsJthBV+utp8y7CMMjQS2cI7k4YGcLSaoOZ/gNUBE9sF7 bUIQMKzJLh30qi/eZxLqTpEK7Gz44KiS9SXW/ePRMxca7wFe+uOcBfXxsuchE1QXNXd6 66qKlGTAz+xlK5ynlDjvPCGmXzsLam9mxWTHm5Ss9sJoUR3NUj4M38xUgkQjwqh7xuHD y3nJ7JgPTG13aiYXb+rfDB4RUWoNbkQLA3b9XLqvBt0DCcHrsTkZKGzCRhlFMk0TaJtv R6nzuexHMXYZZb1FRSWE/SKc/GN6SImfH5ma52vsC/znrLlOD4keN+aQHhsWqezs8/jr h/+Q== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; t=1695130657; s=strato-dkim-0002; d=strato.com; h=Message-ID:Date:Subject:Cc:To:From:Cc:Date:From:Subject:Sender; bh=C+Lkr4ss6MZINaRjRWZbodjkKT7ulOoKXpAu4jeNUT0=; b=qAK5LNPrtWq9JY4GDjefVmvqwUJ2sEwqglqxTPy3dLaDT+pIYRaezv/8uokyl0ZVk5 IVc51zFv1yb541MSm0zm4jRf2djdJ6q8V9QJr81y+l/+BTtqMoDqFiq1Nk4FVdqpw8RG 3YXyenqF1KRadAVnCoy30I1Yh9wXfEdbuzrIHSCGfKj6LHywzH0HzCknZzEEWsuobqfy uS5aoojhsGVwYf/YG3rvDq9KixgxxOp5UHEnRRptsFkf63eo+zgVp71f1b2QS0/i7dVb eCiEMRFOMh7riFMtu2IcQhBzhmFsb8HM3DEF8a7bq3EykafzSTldAJGwdakHyPVGiimY 6Ujg== ARC-Authentication-Results: i=1; strato.com; arc=none; dkim=none X-RZG-CLASS-ID: mo01 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; t=1695130657; s=strato-dkim-0002; d=goldelico.com; h=Message-ID:Date:Subject:Cc:To:From:Cc:Date:From:Subject:Sender; bh=C+Lkr4ss6MZINaRjRWZbodjkKT7ulOoKXpAu4jeNUT0=; b=ZMdtX+2xP1lj3TfciIVF5fsah7wY+MfWwpbvVQttJWfya/seJu5lk4WsgZi/JOO+jC E92uty4UKec96v8dATYwSAjSVH2SE1KsgoT0MzXExJild6lYv7xie7jyMU+mEx9K+a4+ wsLqDT13loVkRwIzRCL5N2yKewPT0Wk1ihmmKC2FwhJenM9b+50ORsh+zgY0SRmOUE6K tbXf9f4N3Z3n03VyJNyaMdhxyR314FWO9iIMFlWT540BOuM8qg/TXctKK0Hm1LNvirKU rZbyeR+3h7JOpBUbZ0fu2fFSMuHI95OMBZL+gRkEQBNlhHlfNC5iyc+x2OHkjfEwhRIS TpIw== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; t=1695130657; s=strato-dkim-0003; d=goldelico.com; h=Message-ID:Date:Subject:Cc:To:From:Cc:Date:From:Subject:Sender; bh=C+Lkr4ss6MZINaRjRWZbodjkKT7ulOoKXpAu4jeNUT0=; b=ifLmEvTKOnMXlMzR3QBCX0YGjjxz8aTIuO14dJRB3MjzPCwotBsh4xxAE0dXltYj8h 14bzI3TlgCCkbFK7ASCA== X-RZG-AUTH: ":JGIXVUS7cutRB/49FwqZ7WcJeFKiMhflhwDubTJ9o1iTDUhfN4hi3qVZrWLJ" Received: from localhost.localdomain by smtp.strato.de (RZmta 49.8.2 DYNA|AUTH) with ESMTPSA id Y04dd7z8JDbYhZC (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256 bits)) (Client did not present a certificate); Tue, 19 Sep 2023 15:37:34 +0200 (CEST) From: "H. Nikolaus Schaller" To: Tomi Valkeinen , tony@atomide.com, David Airlie , Daniel Vetter , Douglas Anderson , =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= , sre@kernel.org, "H. Nikolaus Schaller" , Laurent Pinchart , Arnd Bergmann Subject: [PATCH] omap: dsi: do not WARN on detach if dsidev was never attached Date: Tue, 19 Sep 2023 15:37:28 +0200 Message-ID: <929c46beecf77f2ebfa9f8c9b1c09f6ec610c31a.1695130648.git.hns@goldelico.com> X-Mailer: git-send-email 2.42.0 MIME-Version: 1.0 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: letux-kernel@openphoenux.org, linux-omap@vger.kernel.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, kernel@pyra-handheld.com Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" dsi_init_output() called by dsi_probe() may fail. In that case mipi_dsi_host_unregister() is called which may call omap_dsi_host_detach() with uninitialized dsi->dsidev because omap_dsi_host_attach() was never called before. This happens if the panel driver asks for an EPROBE_DEFER. So let's suppress the WARN() in this special case. [ 7.416759] WARNING: CPU: 0 PID: 32 at drivers/gpu/drm/omapdrm/dss/dsi.c:4419 omap_dsi_host_detach+0x3c/0xbc [omapdrm] [ 7.436053] Modules linked in: ina2xx_adc snd_soc_ts3a227e bq2429x_charger bq27xxx_battery_i2c(+) bq27xxx_battery ina2xx tca8418_keypad as5013(+) omapdrm hci_uart cec palmas_pwrbutton btbcm bmp280_spi palmas_gpadc bluetooth usb3503 ecdh_generic bmc150_accel_i2c bmg160_i2c ecc bmc150_accel_core bmg160_core bmc150_magn_i2c bmp280_i2c bmc150_magn bno055 industrialio_triggered_buffer bmp280 kfifo_buf snd_soc_omap_aess display_connector drm_kms_helper syscopyarea snd_soc_omap_mcbsp snd_soc_ti_sdma sysfillrect ti_tpd12s015 sysimgblt fb_sys_fops wwan_on_off snd_soc_gtm601 generic_adc_battery drm snd_soc_w2cbw003_bt industrialio drm_panel_orientation_quirks pwm_bl pwm_omap_dmtimer ip_tables x_tables ipv6 autofs4 [ 7.507068] CPU: 0 PID: 32 Comm: kworker/u4:2 Tainted: G W 6.1.0-rc3-letux-lpae+ #11107 [ 7.516964] Hardware name: Generic OMAP5 (Flattened Device Tree) [ 7.523284] Workqueue: events_unbound deferred_probe_work_func [ 7.529456] unwind_backtrace from show_stack+0x10/0x14 [ 7.534972] show_stack from dump_stack_lvl+0x40/0x4c [ 7.540315] dump_stack_lvl from __warn+0xb0/0x164 [ 7.545379] __warn from warn_slowpath_fmt+0x70/0x9c [ 7.550625] warn_slowpath_fmt from omap_dsi_host_detach+0x3c/0xbc [omapdrm] [ 7.558137] omap_dsi_host_detach [omapdrm] from mipi_dsi_remove_device_fn+0x10/0x20 [ 7.566376] mipi_dsi_remove_device_fn from device_for_each_child+0x60/0x94 [ 7.573729] device_for_each_child from mipi_dsi_host_unregister+0x20/0x54 [ 7.580992] mipi_dsi_host_unregister from dsi_probe+0x5d8/0x744 [omapdrm] [ 7.588315] dsi_probe [omapdrm] from platform_probe+0x58/0xa8 [ 7.594542] platform_probe from really_probe+0x144/0x2ac [ 7.600249] really_probe from __driver_probe_device+0xc4/0xd8 [ 7.606411] __driver_probe_device from driver_probe_device+0x3c/0xb8 [ 7.613216] driver_probe_device from __device_attach_driver+0x58/0xbc [ 7.620115] __device_attach_driver from bus_for_each_drv+0xa0/0xb4 [ 7.626737] bus_for_each_drv from __device_attach+0xdc/0x150 [ 7.632808] __device_attach from bus_probe_device+0x28/0x80 [ 7.638792] bus_probe_device from deferred_probe_work_func+0x84/0xa0 [ 7.645595] deferred_probe_work_func from process_one_work+0x1a4/0x2d8 [ 7.652587] process_one_work from worker_thread+0x214/0x2b8 [ 7.658567] worker_thread from kthread+0xe4/0xf0 [ 7.663542] kthread from ret_from_fork+0x14/0x1c [ 7.668515] Exception stack(0xf01b5fb0 to 0xf01b5ff8) [ 7.673827] 5fa0: 00000000 00000000 00000000 00000000 [ 7.682435] 5fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 [ 7.691038] 5fe0: 00000000 00000000 00000000 00000000 00000013 00000000 Signed-off-by: H. Nikolaus Schaller Reviewed-by: Tony Lindgren Reviewed-by: Sebastian Reichel --- drivers/gpu/drm/omapdrm/dss/dsi.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/omapdrm/dss/dsi.c b/drivers/gpu/drm/omapdrm/dss/dsi.c index ea63c64d3a1ab..c37eb6b1b9a39 100644 --- a/drivers/gpu/drm/omapdrm/dss/dsi.c +++ b/drivers/gpu/drm/omapdrm/dss/dsi.c @@ -4411,7 +4411,7 @@ static int omap_dsi_host_detach(struct mipi_dsi_host *host, { struct dsi_data *dsi = host_to_omap(host); - if (WARN_ON(dsi->dsidev != client)) + if (!dsi->dsidev || WARN_ON(dsi->dsidev != client)) return -EINVAL; cancel_delayed_work_sync(&dsi->dsi_disable_work);