These patches add wait_until_sent-support to usb-serial, which removes the need to check hardware buffers in chars_in_buffer. This fixes a problem in ftdi_sio (since 3.7) where select or TIOCMOUTQ would take much longer than before due the hardware buffers being queried. Hardware buffers are also currently checked in chars_in_buffer in io_ti (since 3.8) and ti_usb_3410_5052 (in 3.10). Note that simply removing the hardware-buffer checks (e.g. for the stable trees) would break tty_wait_until_sent, which is used, for instance, by tcdrain, tcsendbreak, and close. Johan Johan Hovold (7): USB: serial: add wait_until_sent operation USB: serial: add generic wait_until_sent implementation USB: ftdi_sio: clean up get_modem_status USB: ftdi_sio: fix chars_in_buffer overhead USB: io_ti: fix chars_in_buffer overhead USB: ti_usb_3410_5052: fix chars_in_buffer overhead USB: serial: clean up chars_in_buffer drivers/usb/serial/ftdi_sio.c | 28 +++++++++------------------- drivers/usb/serial/generic.c | 29 +++++++++++++++++++++++++++++ drivers/usb/serial/io_ti.c | 22 ++++++++++++++-------- drivers/usb/serial/ti_usb_3410_5052.c | 23 +++++++++++++++-------- drivers/usb/serial/usb-serial.c | 30 +++++++++++++++++++++--------- include/linux/usb/serial.h | 4 ++++ 6 files changed, 92 insertions(+), 44 deletions(-) -- 1.8.2.1 -- 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
