From: Okash Khawaja <okash.khawaja@gmail.com>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Jiri Slaby <jslaby@suse.com>,
Samuel Thibault <samuel.thibault@ens-lyon.org>,
linux-kernel@vger.kernel.org
Cc: William Hubbs <w.d.hubbs@gmail.com>,
Chris Brannon <chris@the-brannons.com>,
Kirk Reiser <kirk@reisers.ca>,
speakup@linux-speakup.org, devel@driverdev.osuosl.org
Subject: [patch] staging: speakup: check for null before calling TTY's flush_buffer
Date: Wed, 31 May 2017 20:50:12 +0100 [thread overview]
Message-ID: <20170531195012.GA967@sanghar> (raw)
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>
---
drivers/staging/speakup/spk_ttyio.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- 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
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)
reply other threads:[~2017-05-31 19:50 UTC|newest]
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