2014-10-06 11:35:06

by Naveen Kumar Parna

Subject: btusb_intr_complete returns -EPIPE

Hi,

I am using “3.1.0-7.fc16.x86_64” kernel and testing eight USB
Bluetooth dongles using btusb.ko module.


Once I power-on the system and loading the btusb.ko driver immediately
results the below mentioned errors:

[ 1389.410907] hci3 urb ffff88012954dd80 status -32 count 0

[ 1389.411367] hci4 urb ffff88012954d3c0 status -32 count 0

[ 1389.411845] hci1 urb ffff88012b4b6b40 status -32 count 0

[ 1389.412238] hci2 urb ffff8801347ee0c0 status -32 count 0

[ 1518.647255] hci3 urb ffff88012954dd80 status -32 count 0

[ 1518.647722] hci4 urb ffff88012954d3c0 status -32 count 0

[ 1518.648120] hci1 urb ffff88012b4b6b40 status -32 count 0

[ 1518.648514] hci2 urb ffff8801347ee0c0 status -32 count 0

[ 1518.722033] hci2 urb ffff8801347ee0c0 status -32 count 0

[ 2191.964545] hci4 urb ffff88012954d3c0 status -32 count 0

[ 2191.965001] hci1 urb ffff88012b4b6b40 status -32 count 0

[ 2191.965396] hci2 urb ffff8801347ee0c0 status -32 count 0

[ 2191.966530] hci2 urb ffff8801347ee0c0 status -32 count 0

[ 2191.975514] hci4 urb ffff88012954d3c0 status -32 count 0

[ 2191.975936] hci1 urb ffff88012b4b6b40 status -32 count 0

[ 2191.976330] hci2 urb ffff8801347ee0c0 status -32 count 0

[ 2191.977503] hci4 urb ffff88012954d3c0 status -32 count 0

[ 2191.977929] hci1 urb ffff88012b4b6b40 status -32 count 0

[ 2191.978325] hci2 urb ffff8801347ee0c0 status -32 count 0

[ 2560.132682] hci2 urb ffff8801347ee0c0 status -32 count 0

[ 2569.160895] hci4 urb ffff88012954d3c0 status -32 count 0

[ 2569.161367] hci1 urb ffff88012b4b6b40 status -32 count 0

[ 2569.161827] hci2 urb ffff8801347ee0c0 status -32 count 0

[ 3022.252541] hci2 urb ffff8801347ee0c0 status -32 count 0

[ 3022.254504] hci2 urb ffff8801347ee0c0 status -32 count 0


These errors will repeat until sending a proper HCI command on the USB
bus. Again after some time duration same error will repeats.

The error -32(-EPIPE) says , Endpoint stalled. For non-control
endpoints, reset this status with usb_clear_halt().

But I don’t see the error(-EPIPE) handling code in btusb module. Does
anyone has the patch for this scenario?

Thanks,
Naveen

2014-10-06 12:24:28

by Oliver Neukum

Subject: Re: btusb_intr_complete returns -EPIPE

On Mon, 2014-10-06 at 17:05 +0530, Naveen Kumar Parna wrote:
> These errors will repeat until sending a proper HCI command on the USB
> bus. Again after some time duration same error will repeats.
>
> The error -32(-EPIPE) says , Endpoint stalled. For non-control
> endpoints, reset this status with usb_clear_halt().
>
> But I don’t see the error(-EPIPE) handling code in btusb module. Does
> anyone has the patch for this scenario?

It really shouldn't stall without reason. We need to know which
transfers stall. A usbmon trace would show you.

Regards
Oliver