Commit 011cca55 authored May 31, 2017 by Okash Khawaja Committed by Greg Kroah-Hartman Jun 03, 2017

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>

parent d0b112ac

drivers/staging/speakup/spk_ttyio.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -227,6 +227,7 @@ static unsigned char spk_ttyio_in_nowait(void)

		static void spk_ttyio_flush_buffer(void)
		{
		if (speakup_tty->ops->flush_buffer)
		speakup_tty->ops->flush_buffer(speakup_tty);
		}

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