[PATCH] ASoC: rt5677-spi: Handle over reading when flipping bytes

[Curtis Malainey <cujomalainey@chromium.org>]

There is a case when a we want to read a large number of bytes that
require a burst but is not a multiple of the word size (8). When this
happens rt5677_spi_reverse will run off the end of the buffer. The
solution is to tell spi_reverse the actual size of the destination and
stop if we reach it even if we have data left that we read.

Cc: Ben Zhang <benzh@chromium.org>
Signed-off-by: Curtis Malainey <cujomalainey@chromium.org>
---
 sound/soc/codecs/rt5677-spi.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/sound/soc/codecs/rt5677-spi.c b/sound/soc/codecs/rt5677-spi.c
index 84b6bd8b50e1..a4dfa0345c6e 100644
--- a/sound/soc/codecs/rt5677-spi.c
+++ b/sound/soc/codecs/rt5677-spi.c
@@ -101,7 +101,7 @@ static void rt5677_spi_reverse(u8 *dst, u32 dstlen, const u8 *src, u32 srclen)
 	u32 word_size = min_t(u32, dstlen, 8);
 
 	for (w = 0; w < dstlen; w += word_size) {
-		for (i = 0; i < word_size; i++) {
+		for (i = 0; i < word_size && i + w < dstlen; i++) {
 			si = w + word_size - i - 1;
 			dst[w + i] = si < srclen ? src[si] : 0;
 		}
@@ -152,8 +152,9 @@ int rt5677_spi_read(u32 addr, void *rxbuf, size_t len)
 		status |= spi_sync(g_spi, &m);
 		mutex_unlock(&spi_mutex);
 
+
 		/* Copy data back to caller buffer */
-		rt5677_spi_reverse(cb + offset, t[1].len, body, t[1].len);
+		rt5677_spi_reverse(cb + offset, len - offset, body, t[1].len);
 	}
 	return status;
 }
-- 
2.21.0.1020.gf2820cf01a-goog