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 -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
