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greybus: audio-pcm: fix use of variable unitialized

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Compiling with clang shows that period_elapsed will be used as a branch
conditional unitialized whenever snd_dev->transfer_done <
runtime->period_size. Since stack can grow up/down as we proceed though
the call stack this should be fixed. This patch fixes by explicitly
initalizing period_elapsed to zero.

Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Reviewed-by: Alex Elder <elder@linaro.org>
Reviewed-by: Mark Greer <mgreer@animalcreek.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
This commit is contained in:
Bryan O'Donoghue 2015-10-29 16:58:29 +00:00 • committed by Greg Kroah-Hartman
commit 8417f5e56c
1 changed files with 1 additions and 0 deletions
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1
drivers/staging/greybus/audio-pcm.c
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@ -91,6 +91,7 @@ static void gb_pcm_work(struct work_struct *work)
frames = (len + (oldptr % stride)) / stride;
period_elapsed = 0;
snd_dev->transfer_done += frames;
if (snd_dev->transfer_done >= runtime->period_size) {
snd_dev->transfer_done -= runtime->period_size;