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

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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>

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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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drivers/staging/speakup/spk_ttyio.c

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