From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.1 (2015-04-28) on sa.local.altlinux.org X-Spam-Level: X-Spam-Status: No, score=-3.4 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,RP_MATCHES_RCVD autolearn=ham autolearn_force=no version=3.4.1 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=basealt.ru; s=dkim; t=1772188376; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=Mce67PZhpOAoiSh7yXbU5sQT0mPhR/MbUgpivHmNWKw=; b=S4BFmW/Rr9uU7MUio1pN0icpm+HGtLny8Kft0jS5xrJSoufSq6xl4K3k2L4NHDE7wCzVIv +E7FcMRX2arH7qn04S+MC02zG+dt62wLgHTUBGDnkjPsTJxjwyioEBrziMvsLkNfjGG8kV xxKzUtu9tsYcQdLvvbFAvxRdmGAtH7YWNAzltAB3KmqtleygVdVMTNj6FGDaZuKoIhjI1L N0+r/ID0ebGx9YAirR/Fkrkw34ah6vXpb13u5wn8t1PVhZYppsx28v0KrIk0PsZkoBuw2j U77yQ8DPZSis0mJz92e1PeOavUpTFwp2T+dgd3WfJX4nFwnQVS8mTQBjpfbitg== From: Daniil Gnusarev To: gnusarevda@basealt.ru, devel-kernel@lists.altlinux.org Date: Fri, 27 Feb 2026 14:32:17 +0400 Message-ID: <20260227103236.785736-17-gnusarevda@basealt.ru> X-Mailer: git-send-email 2.42.2 In-Reply-To: <20260227103236.785736-1-gnusarevda@basealt.ru> References: <20260227103236.785736-1-gnusarevda@basealt.ru> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Subject: [d-kernel] [PATCH 16/35] drm: baikal-vdu: disable backlight driver loading X-BeenThere: devel-kernel@lists.altlinux.org X-Mailman-Version: 2.1.12 Precedence: list Reply-To: ALT Linux kernel packages development List-Id: ALT Linux kernel packages development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 27 Feb 2026 10:33:09 -0000 Archived-At: List-Archive: List-Post: When starting the driver with lvds an error occurs: [ 14.310460] BUG: scheduling while atomic: swapper/3/0/0x00000103 [ 14.322780] Modules linked in: ..... [ 14.395894] CPU: 3 PID: 0 Comm: swapper/3 Tainted: G W 6.6.41+ #87 [ 14.411147] Hardware name: Edelweiss TF307-MB-S-D/BM1BM1-D, BIOS 5.3 01/10/2022 [ 14.418471] Call trace: [ 14.420925] dump_backtrace+0xa4/0x130 [ 14.424693] show_stack+0x20/0x38 [ 14.428018] dump_stack_lvl+0x48/0x60 [ 14.431696] dump_stack+0x18/0x28 [ 14.435022] __schedule_bug+0x58/0x78 [ 14.438698] __schedule+0x1094/0x17d0 [ 14.442373] schedule+0x64/0x108 [ 14.445611] schedule_preempt_disabled+0x2c/0x50 [ 14.450241] rwsem_down_read_slowpath+0x1e0/0x538 [ 14.454958] down_read+0xb8/0xc8 [ 14.458198] kernfs_find_and_get_ns+0x44/0x88 [ 14.462570] sysfs_notify+0xa4/0xc0 [ 14.466068] backlight_force_update+0xb4/0x118 [ 14.470528] baikal_vdu_input_event+0x7c/0x160 [baikal_vdu_drm] Presumably the error occurs when calling sysfs_notify in the event handler. The called function tries to sleep when executed, which is undesirable. Disable the backlight driver until the problem is solved Signed-off-by: Daniil Gnusarev Do-not-upstream: this is a feature of Baikal-M --- drivers/gpu/drm/baikal/baikal_vdu_drv.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/gpu/drm/baikal/baikal_vdu_drv.c b/drivers/gpu/drm/baikal/baikal_vdu_drv.c index db7ef4c2027c6c..2494bc9d364c00 100644 --- a/drivers/gpu/drm/baikal/baikal_vdu_drv.c +++ b/drivers/gpu/drm/baikal/baikal_vdu_drv.c @@ -459,9 +459,11 @@ static int baikal_vdu_drm_probe(struct platform_device *pdev) dev_info(dev, "No 'lvds-lanes' property found\n"); } if (lvds->ready) { +#if 0 ret = baikal_vdu_backlight_create(drm); if (ret) dev_err(dev, "LVDS: failed to create backlight\n"); +#endif if (bridge_is_baikal_lvds_bridge(lvds->bridge)) { panel_bridge = bridge_to_baikal_lvds_bridge(lvds->bridge); panel_bridge->vdu = lvds; -- 2.42.2