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staging: speakup: check for null before calling TTY's flush_buffer 

We should check the flush_buffer method of a tty for null before
invoking it. Some drivers such as usbserial don't implement
flush_buffer. This will be required for upcoming patches where we expand
spk_ttyio to support more than just ttyS*.

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>
This commit is contained in:
Okash Khawaja 2017-05-31 20:50:12 +01:00 committed by Greg Kroah-Hartman
parent d0b112ac2a
commit 011cca558b
1 changed files with 2 additions and 1 deletions
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3
drivers/staging/speakup/spk_ttyio.c
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@ -227,7 +227,8 @@ static unsigned char spk_ttyio_in_nowait(void)
static void spk_ttyio_flush_buffer(void) static void spk_ttyio_flush_buffer(void)
{ {
speakup_tty->ops->flush_buffer(speakup_tty); if (speakup_tty->ops->flush_buffer)
speakup_tty->ops->flush_buffer(speakup_tty);
} }
int spk_ttyio_synth_probe(struct spk_synth *synth) int spk_ttyio_synth_probe(struct spk_synth *synth)