staging: speakup: flush tty buffers and ensure hardware flow control

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This patch fixes the issue where TTY-migrated synths would take a while
to shut up after hitting numpad enter key. When calling synth_flush,
even though XOFF character is sent as high priority, data buffered in
TTY layer is still sent to the synth. This patch flushes that buffered
data when synth_flush is called.

It also tries to ensure that hardware flow control is enabled, by
setting CRTSCTS using tty's termios.

Reported-by: John Covici <covici@ccs.covici.com>
Signed-off-by: Okash Khawaja <okash.khawaja@gmail.com>
Reviewed-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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This commit is contained in:

Okash Khawaja 2017-05-15 18:45:37 +01:00 • committed by Greg Kroah-Hartman

parent 470790eefe

commit 1c5973675c

8 changed files with 42 additions and 0 deletions

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7

drivers/staging/speakup/serialio.c

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1

drivers/staging/speakup/speakup_audptr.c

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1

drivers/staging/speakup/speakup_decext.c

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1

drivers/staging/speakup/speakup_dectlk.c

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1

drivers/staging/speakup/speakup_spkout.c

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29

drivers/staging/speakup/spk_ttyio.c

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1

drivers/staging/speakup/spk_types.h

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1

drivers/staging/speakup/synth.c

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