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authorOkash Khawaja <okash.khawaja@gmail.com>2017-05-31 20:50:12 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-06-03 17:38:25 +0900
commit011cca558b6256ff14464e61c111707415a0484f (patch)
tree39ab7695404e4ad40653b348426c0f939c470bc2 /drivers/staging/speakup
parentd0b112ac2ae3738a9f1a86f97dc5fbd23be7e123 (diff)
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>
Diffstat (limited to 'drivers/staging/speakup')
-rw-r--r--drivers/staging/speakup/spk_ttyio.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/staging/speakup/spk_ttyio.c b/drivers/staging/speakup/spk_ttyio.c
index ed36240cf382..7b1eaf976f52 100644
--- a/drivers/staging/speakup/spk_ttyio.c
+++ b/drivers/staging/speakup/spk_ttyio.c
@@ -227,7 +227,8 @@ static unsigned char spk_ttyio_in_nowait(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)