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cda3d64772
The tcpm tx timeout cause a deadlock among these mutex locks. - rport->mutex in drivers/phy/rockchip/phy-rockchip-inno-usb2.c - phy->mutex in drivers/phy/phy-core.c - port->lock in drivers/usb/typec/tcpm/tcpm.c The kernel report the following hung_task messages: [ 4393.667144][ T69] Workqueue: events_freezable __dwc3_set_mode [ 4393.667175][ T69] Call trace: [ 4393.667187][ T69] __switch_to+0xf8/0x134 [ 4393.667209][ T69] __schedule+0x5e8/0x96c [ 4393.667226][ T69] schedule+0x7c/0xe4 [ 4393.667244][ T69] schedule_preempt_disabled+0x24/0x40 [ 4393.667263][ T69] __mutex_lock+0x3a4/0x950 [ 4393.667282][ T69] __mutex_lock_slowpath+0x14/0x20 [ 4393.667300][ T69] mutex_lock+0x38/0x70 [ 4393.667317][ T69] rockchip_usb2phy_power_on+0x60/0x1e0 [ 4393.667339][ T69] phy_power_on+0x8c/0x108 [ 4393.667357][ T69] dwc3_core_init+0xbbc/0x17ac [ 4393.667377][ T69] dwc3_resume_common+0x5c/0x4b8 [ 4393.667396][ T69] dwc3_runtime_resume+0x28/0x64 [ 4393.667416][ T69] pm_generic_runtime_resume+0x28/0x3c [ 4393.667437][ T69] genpd_runtime_resume+0x1fc/0x384 [ 4393.667456][ T69] __rpm_callback+0x7c/0x3c4 [ 4393.667477][ T69] rpm_resume+0x43c/0x678 [ 4393.667496][ T69] __pm_runtime_resume+0x4c/0x90 [ 4393.667515][ T69] __dwc3_set_mode+0x5c/0x910 [ 4393.667534][ T69] process_one_work+0x1a8/0x3b8 [ 4393.667557][ T69] worker_thread+0x25c/0x430 [ 4393.667577][ T69] kthread+0xec/0x1b8 [ 4393.667597][ T69] ret_from_fork+0x10/0x20 [ 4393.667713][ T69] Call trace: [ 4393.667725][ T69] __switch_to+0xf8/0x134 [ 4393.667744][ T69] __schedule+0x5e8/0x96c [ 4393.667761][ T69] schedule+0x7c/0xe4 [ 4393.667778][ T69] schedule_preempt_disabled+0x24/0x40 [ 4393.667796][ T69] __mutex_lock+0x3a4/0x950 [ 4393.667814][ T69] __mutex_lock_slowpath+0x14/0x20 [ 4393.667833][ T69] mutex_lock+0x38/0x70 [ 4393.667850][ T69] phy_set_mode_ext+0x3c/0x88 [ 4393.667868][ T69] dwc3_usb_role_switch_set+0x30/0x70 [ 4393.667887][ T69] usb_role_switch_set_role+0x48/0x80 [ 4393.667907][ T69] tcpm_set_roles+0xc0/0x128 [ 4393.667925][ T69] run_state_machine+0x8d8/0x1964 [ 4393.667942][ T69] tcpm_state_machine_work+0x84/0xcc [ 4393.667963][ T69] kthread_worker_fn+0xf4/0x228 [ 4393.667982][ T69] kthread+0xec/0x1b8 [ 4393.668001][ T69] ret_from_fork+0x10/0x20 [ 4393.668641][ T69] Workqueue: events rockchip_chg_detect_work [ 4393.668664][ T69] Call trace: [ 4393.668675][ T69] __switch_to+0xf8/0x134 [ 4393.668694][ T69] __schedule+0x5e8/0x96c [ 4393.668711][ T69] schedule+0x7c/0xe4 [ 4393.668729][ T69] schedule_preempt_disabled+0x24/0x40 [ 4393.668747][ T69] __mutex_lock+0x3a4/0x950 [ 4393.668765][ T69] __mutex_lock_slowpath+0x14/0x20 [ 4393.668784][ T69] mutex_lock+0x38/0x70 [ 4393.668801][ T69] tcpm_psy_set_prop+0x1ec/0x334 [ 4393.668819][ T69] power_supply_set_property+0x28/0x3c [ 4393.668840][ T69] charger_extcon_notifier+0x46c/0x6e4 [ 4393.668858][ T69] raw_notifier_call_chain+0x44/0x70 [ 4393.668876][ T69] extcon_sync+0x124/0x2e4 [ 4393.668895][ T69] extcon_set_state_sync+0x2c/0x3c [ 4393.668913][ T69] rockchip_usb2phy_otg_sm_work+0x2b8/0x48c [ 4393.668934][ T69] rockchip_chg_detect_work+0x460/0x68c [ 4393.668954][ T69] process_one_work+0x1a8/0x3b8 [ 4393.668975][ T69] worker_thread+0x25c/0x430 [ 4393.668995][ T69] kthread+0xec/0x1b8 [ 4393.669014][ T69] ret_from_fork+0x10/0x20 Signed-off-by: Frank Wang <frank.wang@rock-chips.com> Change-Id: I002878b1e2ac23b6c4e9e2daf6d1bd7cd8f86d0a
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.