> > I'm glad to hear that the Bluetooth uart interface is getting
> > some use; that means someone will soon be fixing the hard lockup
> > in hci_uart_tx_wakeup() reported here:
>
> I'm not very familiar with the BT devices on our platforms, but most
> of them are not using the in-kernel BT driver
Hi Peter,
2014-02-26 23:40 GMT+08:00 Peter Hurley :
> [ +cc linux-bluetooth ]
>>>
>>> Historically, low_latency was used to force wake-up the reading
>>> process rather than wait for the next scheduler tick. The
>>> effect was to trim multiple milliseconds of latency from
>>> when the process wou
[ +cc linux-bluetooth ]
Hi Feng,
On 02/26/2014 12:11 AM, Feng Tang wrote:
Hi Peter,
2014-02-22 20:31 GMT+08:00 Peter Hurley :
The user-settable knob, low_latency, has been the source of
several BUG reports which stem from flush_to_ldisc() running
in interrupt context. Since 3.12, which added
Hi Peter,
2014-02-22 20:31 GMT+08:00 Peter Hurley :
> The user-settable knob, low_latency, has been the source of
> several BUG reports which stem from flush_to_ldisc() running
> in interrupt context. Since 3.12, which added several sleeping
> locks (termios_rwsem and buf->lock) to the input proce
On Sat, Feb 22, 2014 at 07:31:21AM -0500, Peter Hurley wrote:
> --- a/drivers/tty/ipwireless/tty.c
> +++ b/drivers/tty/ipwireless/tty.c
> @@ -176,9 +176,6 @@ void ipwireless_tty_received(struct ipw_tty *tty,
> unsigned char *data,
> ": %d chars not inserted to flip bu
> Remove the low_latency rx steering from tty_flip_buffer_push();
> however, leave the knob as an optional hint to drivers that can
> tune their rx fifos and such like. Cleanup stale code comments
> regarding low_latency.
>
> [1] https://lkml.org/lkml/2014/2/20/434
>
> Reported-by: Beat Bolli
>
The user-settable knob, low_latency, has been the source of
several BUG reports which stem from flush_to_ldisc() running
in interrupt context. Since 3.12, which added several sleeping
locks (termios_rwsem and buf->lock) to the input processing path,
the frequency of these BUG reports has increased.
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