ASoC: Fix Blackfin I2S _pointer() implementation return in bounds values

commit e999dc50404d401150a5429b6459473a691fd1a0 upstream.

The Blackfin DMA controller can report one frame beyond the end of the
buffer in the wraparound case but ALSA requires that the pointer always
be in the buffer. Do the wraparound to handle this. A similar bug is
likely to apply to the other Blackfin PCM drivers but the code is less
obvious to inspection and I don't have a user to test.

Reported-by: Kieran O'Leary <Kieran.O'Leary@wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@ti.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/sound/soc/blackfin/bf5xx-i2s-pcm.c b/sound/soc/blackfin/bf5xx-i2s-pcm.c
index 890a0dccf902a4fc14922cd11565406df86ec0b7..bd11e3375bee0a6e4fe1f4855ef8c718c54f7cc8 100644 (file)
--- a/sound/soc/blackfin/bf5xx-i2s-pcm.c
+++ b/sound/soc/blackfin/bf5xx-i2s-pcm.c
@@ -138,11 +138,20 @@ static snd_pcm_uframes_t bf5xx_pcm_pointer(struct snd_pcm_substream *substream)
        pr_debug("%s enter\n", __func__);
        if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
                diff = sport_curr_offset_tx(sport);
-               frames = bytes_to_frames(substream->runtime, diff);
        } else {
                diff = sport_curr_offset_rx(sport);
-               frames = bytes_to_frames(substream->runtime, diff);
        }
+
+       /*
+        * TX at least can report one frame beyond the end of the
+        * buffer if we hit the wraparound case - clamp to within the
+        * buffer as the ALSA APIs require.
+        */
+       if (diff == snd_pcm_lib_buffer_bytes(substream))
+               diff = 0;
+
+       frames = bytes_to_frames(substream->runtime, diff);
+
        return frames;
 }