[lkml]   [2014]   [Mar]   [20]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: Possible software flow problem in serial_core
On 03/20/2014 07:34 PM, Bollinger, Seth wrote:
> Do you have a driver that would be a good example of this? From looking
> at serial_core.c:uart_start(), is seems that start_tx() is only called if
> the serial_core ring buffer is not empty. If we don¹t stop the
> transmitter, we slew too many characters.

Yeah, you're right; thanks for catching this.
(I was busy looking at the ll driver and completely missed the bug in
the serial core).

uart_start() should not be conditioning the call to start_tx() on
the ring buffer being empty; ll drivers should already be able to handle
that because CTS flow control change will start_tx regardless of the ring
buffer count.

Will you send a patch?

Peter Hurley
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2014-03-21 03:01    [W:0.129 / U:0.592 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site