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/openbmc/linux/drivers/tty/serial/ |
H A D | imx.c | 4dec2f11 Sun May 14 07:35:15 CDT 2017 Peter Senna Tschudin <peter.senna@collabora.com> imx-serial: RX DMA startup latency
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.
Signed-off-by: Peter Senna Tschudin <peter.senna@collabora.com> Tested-by: Sascha Hauer <s.hauer@pengutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 4dec2f11 Sun May 14 07:35:15 CDT 2017 Peter Senna Tschudin <peter.senna@collabora.com> imx-serial: RX DMA startup latency 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. Signed-off-by: Peter Senna Tschudin <peter.senna@collabora.com> Tested-by: Sascha Hauer <s.hauer@pengutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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