Hello.
I have a SCL3711 USB NFC adapter alongside a Broadcom Bluetooth USB
dongle. When I don't have the Bluetooth adapter connected everything
works fine while reading and writing to the SCL3711 USB device. As
soon as I connect the Bluetooth dongle and the HCI device is brought
up (by bluetoothd) I get strange results accessing the other USB
device (the SCL3711). Namely, writes only succeed half the time.
The writes that fail look like this:
ioctl(3, USBDEVFS_REAPURBNDELAY or USBDEVFS_REAPURBNDELAY32,
0xbfdddb8c) = -1 EAGAIN (Resource temporarily unavailable)
select(4, NULL, [3], NULL, {0, 1000}) = 0 (Timeout)
gettimeofday({1308174525, 865478}, NULL) = 0
ioctl(3, USBDEVFS_REAPURBNDELAY or USBDEVFS_REAPURBNDELAY32,
0xbfdddb8c) = -1 EAGAIN (Resource temporarily unavailable)
select(4, NULL, [3], NULL, {0, 1000}) = 0 (Timeout)
gettimeofday({1308174525, 866808}, NULL) = 0
ioctl(3, USBDEVFS_REAPURBNDELAY or USBDEVFS_REAPURBNDELAY32,
0xbfdddb8c) = -1 EAGAIN (Resource temporarily unavailable)
select(4, NULL, [3], NULL, {0, 1000}) = 0 (Timeout)
gettimeofday({1308174525, 868073}, NULL) = 0
ioctl(3, USBDEVFS_REAPURBNDELAY or USBDEVFS_REAPURBNDELAY32,
0xbfdddb8c) = -1 EAGAIN (Resource temporarily unavailable)
select(4, NULL, [3], NULL, {0, 1000}) = 0 (Timeout)
...
Even with 10s timeouts it fails. The strange thing is that if I
execute two bulkWrite()s in a row, with the same params, half of them
succeed:
gettimeofday({1308174626, 976740}, NULL) = 0
ioctl(3, USBDEVFS_REAPURBNDELAY or USBDEVFS_REAPURBNDELAY32,
0xbff3ce7c) = -1 EAGAIN (Resource temporarily unavailable)
select(4, NULL, [3], NULL, {0, 1000}) = 0 (Timeout)
gettimeofday({1308174626, 978439}, NULL) = 0
ioctl(3, USBDEVFS_REAPURBNDELAY or USBDEVFS_REAPURBNDELAY32,
0xbff3ce7c) = -1 EAGAIN (Resource temporarily unavailable)
select(4, NULL, [3], NULL, {0, 1000}) = 1 (out [3], left {0, 0})
gettimeofday({1308174626, 979862}, NULL) = 0
ioctl(3, USBDEVFS_REAPURBNDELAY or USBDEVFS_REAPURBNDELAY32, 0xbff3ce7c) = 0
If I bring down the hci0 interface, with a hciconfig hci0 down, as soon as the
ioctl(ctl, HCIDEVDOWN, hdev)
is executed, everything starts working correctly again...
I don't even know where to start with this. Is this bluez related? Any
help would be appreciated. I can provide further info if requested.
Best regards,
André
--
To unsubscribe from this list: send the line "unsubscribe linux-bluetooth" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
