![Peter Chen](/assets/img/avatar_default.png)
If we use USB ID pin as wakeup source, and there is a USB block device on this USB OTG (ID) cable, the system will be deadlock after system resume. The root cause for this problem is: the workqueue ci_otg may try to remove hcd before the driver resume has finished, and hcd will disconnect the device on it, then, it will call device_release_driver, and holds the device lock "dev->mutex", but it is never unlocked since it waits workqueue writeback to run to flush the block information, but the workqueue writeback is freezable, it is not thawed before driver resume has finished. When the driver (device: sd 0:0:0:0:) resume goes to dpm_complete, it tries to get its device lock "dev->mutex", but it can't get it forever, then the deadlock occurs. Below call stacks show the situation. So, in order to fix this problem, we need to change workqueue ci_otg as freezable, then the work item in this workqueue will be run after driver's resume, this workqueue will not be blocked forever like above case since the workqueue writeback has been thawed too. Tested at: i.mx6qdl-sabresd and i.mx6sx-sdb. [ 555.178869] kworker/u2:13 D c07de74c 0 826 2 0x00000000 [ 555.185310] Workqueue: ci_otg ci_otg_work [ 555.189353] Backtrace: [ 555.191849] [<c07de4fc>] (__schedule) from [<c07dec6c>] (schedule+0x48/0xa0) [ 555.198912] r10:ee471ba0 r9:00000000 r8:00000000 r7:00000002 r6:ee470000 r5:ee471ba4 [ 555.206867] r4:ee470000 [ 555.209453] [<c07dec24>] (schedule) from [<c07e2fc4>] (schedule_timeout+0x15c/0x1e0) [ 555.217212] r4:7fffffff r3:edc2b000 [ 555.220862] [<c07e2e68>] (schedule_timeout) from [<c07df6c8>] (wait_for_common+0x94/0x144) [ 555.229140] r8:00000000 r7:00000002 r6:ee470000 r5:ee471ba4 r4:7fffffff [ 555.235980] [<c07df634>] (wait_for_common) from [<c07df790>] (wait_for_completion+0x18/0x1c) [ 555.244430] r10:00000001 r9:c0b5563c r8:c0042e48 r7:ef086000 r6:eea4372c r5:ef131b00 [ 555.252383] r4:00000000 [ 555.254970] [<c07df778>] (wait_for_completion) from [<c0043cb8>] (flush_work+0x19c/0x234) [ 555.263177] [<c0043b1c>] (flush_work) from [<c0043fac>] (flush_delayed_work+0x48/0x4c) [ 555.271106] r8:ed5b5000 r7:c0b38a3c r6:eea439cc r5:eea4372c r4:eea4372c [ 555.277958] [<c0043f64>] (flush_delayed_work) from [<c00eae18>] (bdi_unregister+0x84/0xec) [ 555.286236] r4:eea43520 r3:20000153 [ 555.289885] [<c00ead94>] (bdi_unregister) from [<c02c2154>] (blk_cleanup_queue+0x180/0x29c) [ 555.298250] r5:eea43808 r4:eea43400 [ 555.301909] [<c02c1fd4>] (blk_cleanup_queue) from [<c0417914>] (__scsi_remove_device+0x48/0xb8) [ 555.310623] r7:00000000 r6:20000153 r5:ededa950 r4:ededa800 [ 555.316403] [<c04178cc>] (__scsi_remove_device) from [<c0415e90>] (scsi_forget_host+0x64/0x68) [ 555.325028] r5:ededa800 r4:ed5b5000 [ 555.328689] [<c0415e2c>] (scsi_forget_host) from [<c0409828>] (scsi_remove_host+0x78/0x104) [ 555.337054] r5:ed5b5068 r4:ed5b5000 [ 555.340709] [<c04097b0>] (scsi_remove_host) from [<c04cdfcc>] (usb_stor_disconnect+0x50/0xb4) [ 555.349247] r6:ed5b56e4 r5:ed5b5818 r4:ed5b5690 r3:00000008 [ 555.355025] [<c04cdf7c>] (usb_stor_disconnect) from [<c04b3bc8>] (usb_unbind_interface+0x78/0x25c) [ 555.363997] r8:c13919b4 r7:edd3c000 r6:edd3c020 r5:ee551c68 r4:ee551c00 r3:c04cdf7c [ 555.371892] [<c04b3b50>] (usb_unbind_interface) from [<c03dc248>] (__device_release_driver+0x8c/0x118) [ 555.381213] r10:00000001 r9:edd90c00 r8:c13919b4 r7:ee551c68 r6:c0b546e0 r5:c0b5563c [ 555.389167] r4:edd3c020 [ 555.391752] [<c03dc1bc>] (__device_release_driver) from [<c03dc2fc>] (device_release_driver+0x28/0x34) [ 555.401071] r5:edd3c020 r4:edd3c054 [ 555.404721] [<c03dc2d4>] (device_release_driver) from [<c03db304>] (bus_remove_device+0xe0/0x110) [ 555.413607] r5:edd3c020 r4:ef17f04c [ 555.417253] [<c03db224>] (bus_remove_device) from [<c03d8128>] (device_del+0x114/0x21c) [ 555.425270] r6:edd3c028 r5:edd3c020 r4:ee551c00 r3:00000000 [ 555.431045] [<c03d8014>] (device_del) from [<c04b1560>] (usb_disable_device+0xa4/0x1e8) [ 555.439061] r8:edd3c000 r7:eded8000 r6:00000000 r5:00000001 r4:ee551c00 [ 555.445906] [<c04b14bc>] (usb_disable_device) from [<c04a8e54>] (usb_disconnect+0x74/0x224) [ 555.454271] r9:edd90c00 r8:ee551000 r7:ee551c68 r6:ee551c9c r5:ee551c00 r4:00000001 [ 555.462156] [<c04a8de0>] (usb_disconnect) from [<c04a8fb8>] (usb_disconnect+0x1d8/0x224) [ 555.470259] r10:00000001 r9:edd90000 r8:ee471e2c r7:ee551468 r6:ee55149c r5:ee551400 [ 555.478213] r4:00000001 [ 555.480797] [<c04a8de0>] (usb_disconnect) from [<c04ae5ec>] (usb_remove_hcd+0xa0/0x1ac) [ 555.488813] r10:00000001 r9:ee471eb0 r8:00000000 r7:ef3d9500 r6:eded810c r5:eded80b0 [ 555.496765] r4:eded8000 [ 555.499351] [<c04ae54c>] (usb_remove_hcd) from [<c04d4158>] (host_stop+0x28/0x64) [ 555.506847] r6:eeb50010 r5:eded8000 r4:eeb51010 [ 555.511563] [<c04d4130>] (host_stop) from [<c04d09b8>] (ci_otg_work+0xc4/0x124) [ 555.518885] r6:00000001 r5:eeb50010 r4:eeb502a0 r3:c04d4130 [ 555.524665] [<c04d08f4>] (ci_otg_work) from [<c00454f0>] (process_one_work+0x194/0x420) [ 555.532682] r6:ef086000 r5:eeb502a0 r4:edc44480 [ 555.537393] [<c004535c>] (process_one_work) from [<c00457b0>] (worker_thread+0x34/0x514) [ 555.545496] r10:edc44480 r9:ef086000 r8:c0b1a100 r7:ef086034 r6:00000088 r5:edc44498 [ 555.553450] r4:ef086000 [ 555.556032] [<c004577c>] (worker_thread) from [<c004bab4>] (kthread+0xdc/0xf8) [ 555.563268] r10:00000000 r9:00000000 r8:00000000 r7:c004577c r6:edc44480 r5:eddc15c0 [ 555.571221] r4:00000000 [ 555.573804] [<c004b9d8>] (kthread) from [<c000fef0>] (ret_from_fork+0x14/0x24) [ 555.581040] r7:00000000 r6:00000000 r5:c004b9d8 r4:eddc15c0 [ 553.429383] sh D c07de74c 0 694 691 0x00000000 [ 553.435801] Backtrace: [ 553.438295] [<c07de4fc>] (__schedule) from [<c07dec6c>] (schedule+0x48/0xa0) [ 553.445358] r10:edd3c054 r9:edd3c078 r8:edddbd50 r7:edcbbc00 r6:c1377c34 r5:60000153 [ 553.453313] r4:eddda000 [ 553.455896] [<c07dec24>] (schedule) from [<c07deff8>] (schedule_preempt_disabled+0x10/0x14) [ 553.464261] r4:edd3c058 r3:0000000a [ 553.467910] [<c07defe8>] (schedule_preempt_disabled) from [<c07e0bbc>] (mutex_lock_nested+0x1a0/0x3e8) [ 553.477254] [<c07e0a1c>] (mutex_lock_nested) from [<c03e927c>] (dpm_complete+0xc0/0x1b0) [ 553.485358] r10:00561408 r9:edd3c054 r8:c0b4863c r7:edddbd90 r6:c0b485d8 r5:edd3c020 [ 553.493313] r4:edd3c0d0 [ 553.495896] [<c03e91bc>] (dpm_complete) from [<c03e9388>] (dpm_resume_end+0x1c/0x20) [ 553.503652] r9:00000000 r8:c0b1a9d0 r7:c1334ec0 r6:c1334edc r5:00000003 r4:00000010 [ 553.511544] [<c03e936c>] (dpm_resume_end) from [<c0079894>] (suspend_devices_and_enter+0x158/0x504) [ 553.520604] r4:00000000 r3:c1334efc [ 553.524250] [<c007973c>] (suspend_devices_and_enter) from [<c0079e74>] (pm_suspend+0x234/0x2cc) [ 553.532961] r10:00561408 r9:ed6b7300 r8:00000004 r7:c1334eec r6:00000000 r5:c1334ee8 [ 553.540914] r4:00000003 [ 553.543493] [<c0079c40>] (pm_suspend) from [<c0078a6c>] (state_store+0x6c/0xc0) [ 555.703684] 7 locks held by kworker/u2:13/826: [ 555.708140] #0: ("%s""ci_otg"){++++.+}, at: [<c0045484>] process_one_work+0x128/0x420 [ 555.716277] #1: ((&ci->work)){+.+.+.}, at: [<c0045484>] process_one_work+0x128/0x420 [ 555.724317] #2: (usb_bus_list_lock){+.+.+.}, at: [<c04ae5e4>] usb_remove_hcd+0x98/0x1ac [ 555.732626] #3: (&dev->mutex){......}, at: [<c04a8e28>] usb_disconnect+0x48/0x224 [ 555.740403] #4: (&dev->mutex){......}, at: [<c04a8e28>] usb_disconnect+0x48/0x224 [ 555.748179] #5: (&dev->mutex){......}, at: [<c03dc2f4>] device_release_driver+0x20/0x34 [ 555.756487] #6: (&shost->scan_mutex){+.+.+.}, at: [<c04097d0>] scsi_remove_host+0x20/0x104 Cc: <stable@vger.kernel.org> #v3.14+ Cc: Jun Li <jun.li@nxp.com> Signed-off-by: Peter Chen <peter.chen@nxp.com>
189 lines
3.8 KiB
C
189 lines
3.8 KiB
C
/*
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* otg.c - ChipIdea USB IP core OTG driver
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*
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* Copyright (C) 2013 Freescale Semiconductor, Inc.
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*
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* Author: Peter Chen
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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/*
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* This file mainly handles otgsc register, OTG fsm operations for HNP and SRP
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* are also included.
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*/
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#include <linux/usb/otg.h>
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#include <linux/usb/gadget.h>
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#include <linux/usb/chipidea.h>
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#include "ci.h"
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#include "bits.h"
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#include "otg.h"
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#include "otg_fsm.h"
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/**
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* hw_read_otgsc returns otgsc register bits value.
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* @mask: bitfield mask
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*/
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u32 hw_read_otgsc(struct ci_hdrc *ci, u32 mask)
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{
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struct ci_hdrc_cable *cable;
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u32 val = hw_read(ci, OP_OTGSC, mask);
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/*
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* If using extcon framework for VBUS and/or ID signal
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* detection overwrite OTGSC register value
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*/
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cable = &ci->platdata->vbus_extcon;
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if (!IS_ERR(cable->edev)) {
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if (cable->changed)
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val |= OTGSC_BSVIS;
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else
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val &= ~OTGSC_BSVIS;
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cable->changed = false;
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if (cable->state)
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val |= OTGSC_BSV;
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else
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val &= ~OTGSC_BSV;
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}
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cable = &ci->platdata->id_extcon;
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if (!IS_ERR(cable->edev)) {
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if (cable->changed)
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val |= OTGSC_IDIS;
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else
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val &= ~OTGSC_IDIS;
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cable->changed = false;
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if (cable->state)
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val |= OTGSC_ID;
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else
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val &= ~OTGSC_ID;
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}
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return val;
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}
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/**
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* hw_write_otgsc updates target bits of OTGSC register.
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* @mask: bitfield mask
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* @data: to be written
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*/
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void hw_write_otgsc(struct ci_hdrc *ci, u32 mask, u32 data)
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{
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hw_write(ci, OP_OTGSC, mask | OTGSC_INT_STATUS_BITS, data);
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}
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/**
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* ci_otg_role - pick role based on ID pin state
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* @ci: the controller
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*/
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enum ci_role ci_otg_role(struct ci_hdrc *ci)
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{
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enum ci_role role = hw_read_otgsc(ci, OTGSC_ID)
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? CI_ROLE_GADGET
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: CI_ROLE_HOST;
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return role;
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}
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void ci_handle_vbus_change(struct ci_hdrc *ci)
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{
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if (!ci->is_otg)
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return;
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if (hw_read_otgsc(ci, OTGSC_BSV))
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usb_gadget_vbus_connect(&ci->gadget);
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else
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usb_gadget_vbus_disconnect(&ci->gadget);
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}
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#define CI_VBUS_STABLE_TIMEOUT_MS 5000
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static void ci_handle_id_switch(struct ci_hdrc *ci)
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{
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enum ci_role role = ci_otg_role(ci);
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if (role != ci->role) {
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dev_dbg(ci->dev, "switching from %s to %s\n",
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ci_role(ci)->name, ci->roles[role]->name);
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ci_role_stop(ci);
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if (role == CI_ROLE_GADGET)
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/* wait vbus lower than OTGSC_BSV */
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hw_wait_reg(ci, OP_OTGSC, OTGSC_BSV, 0,
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CI_VBUS_STABLE_TIMEOUT_MS);
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ci_role_start(ci, role);
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}
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}
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/**
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* ci_otg_work - perform otg (vbus/id) event handle
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* @work: work struct
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*/
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static void ci_otg_work(struct work_struct *work)
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{
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struct ci_hdrc *ci = container_of(work, struct ci_hdrc, work);
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if (ci_otg_is_fsm_mode(ci) && !ci_otg_fsm_work(ci)) {
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enable_irq(ci->irq);
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return;
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}
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pm_runtime_get_sync(ci->dev);
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if (ci->id_event) {
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ci->id_event = false;
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ci_handle_id_switch(ci);
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} else if (ci->b_sess_valid_event) {
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ci->b_sess_valid_event = false;
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ci_handle_vbus_change(ci);
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} else
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dev_err(ci->dev, "unexpected event occurs at %s\n", __func__);
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pm_runtime_put_sync(ci->dev);
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enable_irq(ci->irq);
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}
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/**
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* ci_hdrc_otg_init - initialize otg struct
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* ci: the controller
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*/
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int ci_hdrc_otg_init(struct ci_hdrc *ci)
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{
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INIT_WORK(&ci->work, ci_otg_work);
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ci->wq = create_freezable_workqueue("ci_otg");
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if (!ci->wq) {
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dev_err(ci->dev, "can't create workqueue\n");
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return -ENODEV;
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}
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if (ci_otg_is_fsm_mode(ci))
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return ci_hdrc_otg_fsm_init(ci);
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return 0;
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}
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/**
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* ci_hdrc_otg_destroy - destroy otg struct
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* ci: the controller
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*/
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void ci_hdrc_otg_destroy(struct ci_hdrc *ci)
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{
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if (ci->wq) {
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flush_workqueue(ci->wq);
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destroy_workqueue(ci->wq);
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}
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/* Disable all OTG irq and clear status */
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hw_write_otgsc(ci, OTGSC_INT_EN_BITS | OTGSC_INT_STATUS_BITS,
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OTGSC_INT_STATUS_BITS);
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if (ci_otg_is_fsm_mode(ci))
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ci_hdrc_otg_fsm_remove(ci);
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}
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