ASoC: sgtl5000: avoid division by zero if lo_vag is zero

[ Upstream commit 9ab708aef61f5620113269a9d1bdb1543d1207d0 ]

In the case where lo_vag <= SGTL5000_LINE_OUT_GND_BASE, lo_vag
is set to zero and later vol_quot is computed by dividing by
lo_vag causing a division by zero error.  Fix this by avoiding
a zero division and set vol_quot to zero in this specific case
so that the lowest setting for i is correctly set.

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/sound/soc/codecs/sgtl5000.c b/sound/soc/codecs/sgtl5000.c
index 4808b70..a3dd703 100644 (file)
--- a/sound/soc/codecs/sgtl5000.c
+++ b/sound/soc/codecs/sgtl5000.c
@@ -1415,7 +1415,7 @@ static int sgtl5000_set_power_regs(struct snd_soc_codec *codec)
         * Searching for a suitable index solving this formula:
         * idx = 40 * log10(vag_val / lo_cagcntrl) + 15
         */
-       vol_quot = (vag * 100) / lo_vag;
+       vol_quot = lo_vag ? (vag * 100) / lo_vag : 0;
        lo_vol = 0;
        for (i = 0; i < ARRAY_SIZE(vol_quot_table); i++) {
                if (vol_quot >= vol_quot_table[i])