On Wed, Jul 12, 2017 at 07:05:06PM -0300, Fabio Estevam wrote: > From: Peter Senna Tschudin <peter.senna@xxxxxxxxxxxxx> > > commit 4dec2f119e86f9c91e60cdd8f0cc057452e331a9 upstream. > > 18a4208 introduced a change to reduce the RX DMA latency on the first reception > when the serial port was opened for reading. However it was claiming a hardirq > unsafe lock after a hardirq safe lock which is not allowed and causes lockdep > to complain verbosely. > > This patch changes the code to always start RX DMA earlier, instead of > relying on the flags used to open the serial port removing the code that > was looking for the serial file flags. > > Cc: <stable@xxxxxxxxxxxxxxx> #4.12.x > Signed-off-by: Peter Senna Tschudin <peter.senna@xxxxxxxxxxxxx> > Tested-by: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx> > Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> > Signed-off-by: Fabio Estevam <festevam@xxxxxxxxx> > --- > drivers/tty/serial/imx.c | 26 +++++--------------------- > 1 file changed, 5 insertions(+), 21 deletions(-) What are you asking for here, for this to be added to the 4.12-stable tree? Or something else? Please always be explicit... thanks, greg k-h