| From 3b6947dd9359eb39d7c76045a8f1383cf0e7ddd2 Mon Sep 17 00:00:00 2001 |
| From: Sasha Levin <sashal@kernel.org> |
| Date: Thu, 6 Sep 2018 11:41:52 +0100 |
| Subject: ASoC: sgtl5000: avoid division by zero if lo_vag is zero |
| |
| From: Colin Ian King <colin.king@canonical.com> |
| |
| [ 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> |
| --- |
| sound/soc/codecs/sgtl5000.c | 2 +- |
| 1 file changed, 1 insertion(+), 1 deletion(-) |
| |
| diff --git a/sound/soc/codecs/sgtl5000.c b/sound/soc/codecs/sgtl5000.c |
| index 64a52d495b1f5..896412d11a31c 100644 |
| --- a/sound/soc/codecs/sgtl5000.c |
| +++ b/sound/soc/codecs/sgtl5000.c |
| @@ -1387,7 +1387,7 @@ static int sgtl5000_set_power_regs(struct snd_soc_component *component) |
| * 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]) |
| -- |
| 2.20.1 |
| |
