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Staging: speakup: don't die if accessing sysfs without synth 

Setting a 'silent' parameter without a synth would crash the kernel.

Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sasha Levin 2014-05-27 19:08:36 -04:00 committed by Greg Kroah-Hartman
parent 6371f2105a
commit 8b9c012a42
1 changed files with 3 additions and 0 deletions
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3
drivers/staging/speakup/synth.c
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@ -212,6 +212,9 @@ void synth_start(void)
void spk_do_flush(void) void spk_do_flush(void)
{ {
if (!synth)
return;
speakup_info.flushing = 1; speakup_info.flushing = 1;
synth_buffer_clear(); synth_buffer_clear();
if (synth->alive) { if (synth->alive) {