Re: [PATCH] HID: hid-sensor-hub: do not process feature reports in raw_event

[Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>]

Thanks Daniel.

I don't know if this should be fixed in client drivers since other 
drivers may have this issue.

I interpret the return value of hdrv->raw_event as :
"<0"     : Error. The driver has parsed the message and found issue
"==0"  :    No error and driver has consumed report
">0" : Not an error and driver has not parsed or consumed the event

In this case hid-sensor-hub didn't parse message to return any error or 
to say consumed.

May be hid-core.c

        if (hdrv && hdrv->raw_event && hid_match_report(hid, report)) {
                 ret = hdrv->raw_event(hid, report, data, size);
                 if (ret < 0) {
                         goto unlock;
                 }
         }


I think Jiri can have better idea.

Thanks,
Srinivas


On 04/09/2013 04:55 PM, Daniel Leung wrote:
>>> On Mon, 25 Mar 2013, Srinivas Pandruvada wrote:
>>>
>>>> Daniel,
>>>>
>>>> I am looking at 3.9.rc1.
>>>> The only place I see the raw_event callback is called from
>>>> hid/hid_input_report(). hid_input_report is called with type
>>>> HID_INPUT_REPORT
>>>> in all cases, except hid_ctrl(), where it can be different depending on
>>>> xx.report->type. But here, the return value is not checked.
>>>>
>>>> Do you know the call chain for HID_FETURE_REPORT, where this is
>>>> creating
>>>> problem?
>>> This was exactly what I was wondering about when I have seen the initial
>>> patch a few weeks ago.
>>>
>>> Daniel, could you please elaborate? Is there a out-of-tree driver for
>>> Acer
>>> Iconia W700?
>> Sorry for the late reply. I was out of town and was having difficulties
>> accessing the mail server.
>>
>> For the call path, here is what I got (using WARN_ON()):
>>
>> <4>[  150.943775] ------------[ cut here ]------------
>> <4>[  150.943861] WARNING: at
>> ../../../../../../../../../../home/dleung/android/ia/private/jb-mr1-internal/kernel/intel/drivers/hid/hid-sensor-hub.c:418
>> sensor_hub_raw_event+0x2d0/0x3b0 [hid_sensor_hub]()
>> <4>[  150.944028] Hardware name: ICONIA W700
>> <7>[  150.944071] Modules linked in: hid_sensor_als hid_sensor_gyro_3d
>> hid_sensor_accel_3d uvcvideo videobuf2_vmalloc videobuf2_memops
>> videobuf2_core btusb bluetooth hid_multitouch ath9k ath9k_common ath9k_hw
>> ath snd_hda_codec_hdmi snd_hda_codec_realtek ip6table_raw snd_hda_intel
>> iptable_raw snd_hda_codec snd_hwdep snd_pcm snd_page_alloc snd_timer snd
>> soundcore hid_sensor_trigger hid_sensor_iio_common hid_sensor_hub
>> industrialio_triggered_buffer kfifo_buf industrialio coretemp
>> <7>[  150.944132] Pid: 0, comm: swapper/1 Not tainted
>> 3.8.0-aia1-00043-gd7fd780-dirty #2
>> <7>[  150.944136] Call Trace:
>> <7>[  150.944141]  <IRQ>  [<ffffffff8105b5bf>]
>> warn_slowpath_common+0x7f/0xc0
>> <7>[  150.944163]  [<ffffffff8105b61a>] warn_slowpath_null+0x1a/0x20
>> <7>[  150.944173]  [<ffffffffa00315e0>] sensor_hub_raw_event+0x2d0/0x3b0
>> [hid_sensor_hub]
>> <7>[  150.944184]  [<ffffffff819021e7>] ?
>> _raw_spin_unlock_irqrestore+0x57/0x70
>> <7>[  150.944195]  [<ffffffff816ccce3>] hid_input_report+0x283/0x2d0
>> <7>[  150.944203]  [<ffffffff816d9faf>] hid_ctrl+0x9f/0x180
>> <7>[  150.944212]  [<ffffffff815b2087>] usb_hcd_giveback_urb+0x77/0x110
>> <7>[  150.944222]  [<ffffffff8160073f>] xhci_irq+0x60f/0x1530
>> <7>[  150.944230]  [<ffffffff810df0fe>] ? handle_edge_irq+0x1e/0x130
>> <7>[  150.944239]  [<ffffffff810af04f>] ?
>> __lock_acquire.isra.31+0x28f/0xa70
>> <7>[  150.944247]  [<ffffffff81601671>] xhci_msi_irq+0x11/0x20
>> <7>[  150.944258]  [<ffffffff810dc395>] handle_irq_event_percpu+0x55/0x210
>> <7>[  150.944267]  [<ffffffff810dc598>] handle_irq_event+0x48/0x70
>> <7>[  150.944273]  [<ffffffff810df157>] handle_edge_irq+0x77/0x130
>> <7>[  150.944283]  [<ffffffff81004180>] handle_irq+0x60/0x150
>> <7>[  150.944293]  [<ffffffff81906406>] ?
>> atomic_notifier_call_chain+0x16/0x20
>> <7>[  150.944302]  [<ffffffff8190c38a>] do_IRQ+0x5a/0xe0
>> <7>[  150.944309]  [<ffffffff8190266f>] common_interrupt+0x6f/0x6f
>> <7>[  150.944313]  <EOI>  [<ffffffff816a97f5>] ?
>> cpuidle_wrap_enter+0x55/0xa0
>> <7>[  150.944327]  [<ffffffff816a97f1>] ? cpuidle_wrap_enter+0x51/0xa0
>> <7>[  150.944334]  [<ffffffff816a9850>] cpuidle_enter_tk+0x10/0x20
>> <7>[  150.944341]  [<ffffffff816a940f>] cpuidle_idle_call+0xaf/0x2b0
>> <7>[  150.944350]  [<ffffffff8100b3aa>] cpu_idle+0xda/0x130
>> <7>[  150.944360]  [<ffffffff818f081d>] start_secondary+0x266/0x268
>> <4>[  150.944365] ---[ end trace 32319d39ebee5616 ]---
>>
>>
>> You can see that it went through hid_ctrl().
>>
>>  From what I can gather using usbmon, the sensor hub sends the feature
>> report correctly. However, the in-kernel struct is not updated when the
>> report comes in. Therefore, the report from sensor_hub_report() is always
>> zero-filled. When calling sensor_hub_set_feature(), those zeros are being
>> sent back to the device. The feature report contains fields for power
>> state and reporting state. If they are set to zero, the firmware does not
>> know what to do as zero means undefined state. Both power and reporting
>> states have to be set for sensor to report values. Given the zero-filled
>> report, and we can only deal with one field in sensor_hub_set_feature(),
>> setting power state to non-zero also sends zero (i.e. undefined state) to
>> the reporting state field, and vice versa.
>>
>> The sensor hub on Acer Iconia W700 is using drivers/hid/hid-sensor-hub.c.
>> I also played with Sony Vaio Duo 11 a while back (before having this
>> patch), and was having trouble turning on gyroscope. I suspect it is
>> caused by the same issue. The sensor hub on Acer is from STMicro, while
>> the one in Vaio Duo is from Freescale.
> Just to clarify a little bit on the issue.
>
> Although hid_ctrl() does not care the return value of hid_input_report(),
> the issue is within hid_input_report(). In drivers/hid/hid-core.c:1317
> where raw_event() is called, if return is non-zero, the following call of
> hid_report_raw_event() is skipped. This call is needed to have the
> in-kernel struct updated with the actual feature report from device.
>
>
> Daniel
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