RX Stress tests of unidirectional bulk traffic with
bitrates of up to 220Mbit/s have revealed that the
fatal-event recovery logic [which was solely triggered
by an out-of-rx-buffer situation] is too aggressive.

The new method now "pings" the device and then
decides - based on the response - whenever
a restart is needed or not.
Signed-off-by: NChristian Lamparter <chunkeey@googlemail.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

If __carl9170_exec_cmd fails to upload an asynchronous
command to the device, the functions: carl9170_reboot
and carl9170_powersave will leak the temporary command
assembly buffer.
Signed-off-by: NChristian Lamparter <chunkeey@googlemail.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

This patch fixes a bug in the driver which was
exposed by CONFIG_USB_DEBUG:
	"usb 1-1.6.3: BOGUS urb flags, 40 --> 0"

The transfer flag "URB_ZERO_PACKET" is only valid
for bulk urbs.

Reported-by: André Erdmann
Signed-off-by: NChristian Lamparter <chunkeey@googlemail.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

Don't mark the device as completely dead just yet.
If all goes to plan and carl9170_reboot succeeds
then we can skip the expensive userspace-driven
reinitialization anyway.

And if it doesn't and carl9170_reboot fails,
then carl9170_usb_cancel_urbs will do the
necessary steps.
Signed-off-by: NChristian Lamparter <chunkeey@googlemail.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

This patch prevents the tasklet code from
interfering while the firmware is down for
an unscheduled maintenance.
Signed-off-by: NChristian Lamparter <chunkeey@googlemail.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

Signed-off-by: NChristian Lamparter <chunkeey@googlemail.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>