Re: [PATCH] drivers/base/power: reset transition_started at dpm_resume_noirq

["Rafael J. Wysocki" <rjw@sisk.pl>]

On Monday 17 August 2009, Xiaotian Feng wrote:
> transition_started should be set once the preparation of devices for
> a PM has started, reset before starting to resume devices. When resuming
> devices, kernel calls dpm_resume_noirq then dpm_resume_end(dpm_resume).
> Thus we should reset transition_started at dpm_resume_noirq.
> 
> This patch fixes acpi warning when resuming from suspend/hibernate:
> 
> ACPI: \_SB_.PCI0.IDE1.PRI1.MAS1 - docking
> ------------[ cut here ]------------
> WARNING: at drivers/base/power/main.c:87 device_pm_add+0x8b/0xcc()
> Hardware name: OptiPlex 760
> Device: acpi
> Parentless device registered during a PM transaction
> Modules linked in: fuse sco bridge stp llc bnep l2cap bluetooth sunrpc ip6t_REJECT nf_conntrack_ipv6 ip6table_filter ip6_tables ipv6 dm_multipath uinput snd_hda_codec_analog radeon ppdev parport_pc snd_hda_intel ttm snd_hda_codec serio_raw snd_hwdep iTCO_wdt drm i2c_i801 parport iTCO_vendor_support pcspkr snd_pcm snd_timer i2c_algo_bit i2c_core snd dcdbas wmi e1000e soundcore snd_page_alloc ata_generic pata_acpi [last unloaded: speedstep_lib]
> Pid: 33, comm: kacpi_hotplug Not tainted 2.6.31-rc5 #51
> Call Trace:
>  [<ffffffff8104ece1>] warn_slowpath_common+0x7c/0x94
>  [<ffffffff8104ed50>] warn_slowpath_fmt+0x41/0x43
>  [<ffffffff812ae827>] device_pm_add+0x8b/0xcc
>  [<ffffffff812a820b>] device_add+0x36f/0x519
>  [<ffffffff812a83d3>] device_register+0x1e/0x22
>  [<ffffffff81245c86>] acpi_add_single_object+0xb48/0xd68
>  [<ffffffff810750d6>] ? trace_hardirqs_on_caller+0x1f/0x159
>  [<ffffffff8107521d>] ? trace_hardirqs_on+0xd/0xf
>  [<ffffffff812461cb>] acpi_bus_add+0x2a/0x40
>  [<ffffffff81244128>] ? acpi_bus_get_device+0x47/0x66
>  [<ffffffff81247c52>] hotplug_dock_devices+0x109/0x133
>  [<ffffffff812423b1>] ? acpi_os_execute_hp_deferred+0x0/0x43
>  [<ffffffff81248013>] acpi_dock_deferred_cb+0xbf/0x192
>  [<ffffffff812423e7>] acpi_os_execute_hp_deferred+0x36/0x43
>  [<ffffffff8106099a>] worker_thread+0x215/0x31d
>  [<ffffffff81060945>] ? worker_thread+0x1c0/0x31d
>  [<ffffffff81415f34>] ? thread_return+0x3e/0xaf
>  [<ffffffff810739bb>] ? lock_release_holdtime+0x2c/0x11d
>  [<ffffffff8106549e>] ? autoremove_wake_function+0x0/0x39
>  [<ffffffff81060785>] ? worker_thread+0x0/0x31d
>  [<ffffffff8106513c>] kthread+0x8a/0x92
>  [<ffffffff81012d4a>] child_rip+0xa/0x20
>  [<ffffffff810126d0>] ? restore_args+0x0/0x30
>  [<ffffffff810650b2>] ? kthread+0x0/0x92
>  [<ffffffff81012d40>] ? child_rip+0x0/0x20
> ---[ end trace 6f4892372e7d9f1a ]---
> 
> Signed-off-by: Xiaotian Feng <dfeng@redhat.com>

OK, we can do this IMO.

Alan, what do you think?

Rafael


> ---
>  drivers/base/power/main.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c
> index 58a3e57..808fb14 100644
> --- a/drivers/base/power/main.c
> +++ b/drivers/base/power/main.c
> @@ -355,6 +355,7 @@ void dpm_resume_noirq(pm_message_t state)
>  	struct device *dev;
>  
>  	mutex_lock(&dpm_list_mtx);
> +	transition_started = false;
>  	list_for_each_entry(dev, &dpm_list, power.entry)
>  		if (dev->power.status > DPM_OFF) {
>  			int error;
> @@ -433,7 +434,6 @@ static void dpm_resume(pm_message_t state)
>  
>  	INIT_LIST_HEAD(&list);
>  	mutex_lock(&dpm_list_mtx);
> -	transition_started = false;
>  	while (!list_empty(&dpm_list)) {
>  		struct device *dev = to_device(dpm_list.next);