Commit a1bf9584 authored by Committed by Greg Kroah-Hartman
tty: Add driver unthrottle in ioctl(...,TCFLSH,..).
Regression 'tty: fix "IRQ45: nobody cared"' Regression commit 7b292b4b Function reset_buffer_flags() also invoked during the ioctl(...,TCFLSH,..). At the time of request we can have full buffers and throttled driver too. If we don't unthrottle driver, we can get forever throttled driver, because, after request, we will have empty buffers and throttled driver and there is no place to unthrottle driver. It simple reproduce with "pty" pair then one side sleep on tty->write_wait, and other side do ioctl(...,TCFLSH,..). Then there is no place to do writers wake up. Signed-off-by: Ilya Zykov <firstname.lastname@example.org> Cc: Alan Cox <email@example.com> Signed-off-by: Greg Kroah-Hartman <firstname.lastname@example.org>
Showing with 6 additions and 2 deletions