From 96fbf771d86a90ff006bc62ca4d4de6474b3de31 Mon Sep 17 00:00:00 2001 From: Devin Heitmueller Date: Thu, 15 Oct 2009 01:14:34 -0300 Subject: V4L/DVB (13190): em28xx: fix panic that can occur when starting audio streaming Because the counters were not reset when starting up streaming, they would be reused from the previous run. This can result in cases such that when the second instance of streaming starts up, the "cnt" variable in em28xx_audio_isocirq() can end up being negative, resulting in attempting to write to memory before the start of runtime->dma_area (as well as having a negative number of bytes to copy). Signed-off-by: Devin Heitmueller CC: stable@kernel.org Signed-off-by: Mauro Carvalho Chehab --- drivers/media/video/em28xx/em28xx-audio.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/media/video/em28xx/em28xx-audio.c b/drivers/media/video/em28xx/em28xx-audio.c index 7bd8a70..ac947ae 100644 --- a/drivers/media/video/em28xx/em28xx-audio.c +++ b/drivers/media/video/em28xx/em28xx-audio.c @@ -383,6 +383,11 @@ static int snd_em28xx_hw_capture_free(struct snd_pcm_substream *substream) static int snd_em28xx_prepare(struct snd_pcm_substream *substream) { + struct em28xx *dev = snd_pcm_substream_chip(substream); + + dev->adev.hwptr_done_capture = 0; + dev->adev.capture_transfer_done = 0; + return 0; } -- cgit v1.1