From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stanislav Meduna Subject: w1-gpio: sleeping function called from invalid context Date: Wed, 16 Apr 2014 16:46:32 +0200 Message-ID: <534E97C8.5090407@meduna.org> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit To: zbr@ioremap.net, "linux-kernel@vger.kernel.org" , "linux-rt-users@vger.kernel.org" Return-path: Received: from www.meduna.org ([92.240.244.38]:46810 "EHLO meduna.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1161422AbaDPOql (ORCPT ); Wed, 16 Apr 2014 10:46:41 -0400 Sender: linux-rt-users-owner@vger.kernel.org List-ID: Hi, trying 1-wire with rt-patched Linux 3.12.15-rt25+ and lock debugging: [ 12.055550] BUG: sleeping function called from invalid context at /home/stano/Kernels/linux-3.12-rt/kernel/rtmutex.c:673 [ 12.055573] in_atomic(): 0, irqs_disabled(): 128, pid: 92, name: w1_bus_master1 [ 12.055588] 2 locks held by w1_bus_master1/92: [ 12.055675] #0: (&dev->mutex){+.+...}, at: [] w1_process+0xbc/0xe0 [ 12.055729] #1: (&dev->bus_mutex){+.+...}, at: [] w1_search+0x78/0x1e8 [ 12.055741] irq event stamp: 374 [ 12.055787] hardirqs last enabled at (373): [] _raw_spin_unlock_irqrestore+0x6c/0x74 [ 12.055815] hardirqs last disabled at (374): [] w1_touch_bit+0x50/0xc4 [ 12.055860] softirqs last enabled at (0): [] copy_process+0x37c/0x1178 [ 12.055876] softirqs last disabled at (0): [< (null)>] (null) [ 12.055899] CPU: 0 PID: 92 Comm: w1_bus_master1 Not tainted 3.12.15-rt25+ #66 [ 12.055973] [] (unwind_backtrace+0x0/0xf4) from [] (show_stack+0x10/0x14) [ 12.056020] [] (show_stack+0x10/0x14) from [] (rt_spin_lock+0x20/0x60) [ 12.056080] [] (rt_spin_lock+0x20/0x60) from [] (gpiod_direction_output+0x50/0x2fc) [ 12.056122] [] (gpiod_direction_output+0x50/0x2fc) from [] (w1_touch_bit+0x64/0xc4) [ 12.056156] [] (w1_touch_bit+0x64/0xc4) from [] (w1_write_8+0x54/0x7c) [ 12.056196] [] (w1_write_8+0x54/0x7c) from [] (w1_search+0xa0/0x1e8) [ 12.056239] [] (w1_search+0xa0/0x1e8) from [] (w1_search_process_cb+0x50/0xe0) [ 12.056280] [] (w1_search_process_cb+0x50/0xe0) from [] (w1_process+0xcc/0xe0) [ 12.056334] [] (w1_process+0xcc/0xe0) from [] (kthread+0xa0/0xa8) [ 12.056379] [] (kthread+0xa0/0xa8) from [] (ret_from_fork+0x14/0x34) This happens reproducibly on any access. Please Cc: me when replying Thanks -- Stano