linux-kernel - [PATCH 0/4] tty/serial: atmel: rework tasklets and shutdown sequence

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Date:	Fri, 17 Jun 2016 12:05:45 +0200
From:	Nicolas Ferre <nicolas.ferre@...el.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
	<linux-serial@...r.kernel.org>
CC:	<linux-kernel@...r.kernel.org>,
	Boris BREZILLON <boris.brezillon@...e-electrons.com>,
	Ludovic Desroches <ludovic.desroches@...el.com>,
	Nicolas Ferre <nicolas.ferre@...el.com>
Subject: [PATCH 0/4] tty/serial: atmel: rework tasklets and shutdown sequence

We experienced some issues with how the atmel_serial driver was dealing with
tasklets.
First, a single tasklet was used for both RX and TX paths which was leading to
calling DMA residue checking routines frequently without reason. So I split the
RX and TX paths with one tasklet for each.
Secondly, as we experienced some deadlocks, I reinforced the shutdown function
of this driver by following the recommended sequence that is described
here:
https://lwn.net/Articles/588457/

The first 3 patches have already been posted on May 12th. The 4th patch is
built on top of them, this is why make a series with them...

Bye,

Ludovic Desroches (1):
  tty/serial: atmel: add comment for the ring buffer size macro

Nicolas Ferre (3):
  tty/serial: atmel: re-integrate status check in irq handler
  tty/serial: atmel: split tx and rx paths
  tty/serial: atmel: enforce tasklet init and termination sequences

 drivers/tty/serial/atmel_serial.c | 129 +++++++++++++++++++++++---------------
 1 file changed, 78 insertions(+), 51 deletions(-)

-- 
2.9.0