Commit 2458adb8f92a
("SoC: simple-card-utils: set 0Hz to sysclk when shutdown")
added a call to snd_soc_dai_set_sysclk() with 0 Hz frequency. Being
propagated further it causes a division by zero in clk-ep93xx driver:
Division by zero in kernel.
CPU: 0 PID: 52 Comm: aplay Tainted: G W 6.2.0-rc4-... #1
Hardware name: Generic DT based system
unwind_backtrace from show_stack+0x10/0x18
show_stack from dump_stack_lvl+0x28/0x34
dump_stack_lvl from __div0+0x10/0x1c
__div0 from Ldiv0+0x8/0x1c
Ldiv0 from ep93xx_mux_determine_rate+0x78/0x1d0
ep93xx_mux_determine_rate from clk_core_round_rate_nolock+0x48/0xc8
clk_core_round_rate_nolock from clk_core_set_rate_nolock+0x48/0x160
clk_core_set_rate_nolock from clk_set_rate+0x30/0x8c
clk_set_rate from ep93xx_i2s_set_sysclk+0x30/0x6c
ep93xx_i2s_set_sysclk from snd_soc_dai_set_sysclk+0x3c/0xa4
snd_soc_dai_set_sysclk from asoc_simple_shutdown+0xb8/0x164
asoc_simple_shutdown from snd_soc_link_shutdown+0x44/0x54
snd_soc_link_shutdown from soc_pcm_clean+0x78/0x180
soc_pcm_clean from soc_pcm_close+0x28/0x40
soc_pcm_close from snd_pcm_release_substream.part.0+0x3c/0x84
snd_pcm_release_substream.part.0 from snd_pcm_release+0x40/0x88
snd_pcm_release from __fput+0x74/0x278
There has been commit f1879d7b98dc ("ASoC: rockchip: ignore 0Hz sysclk"),
but it prepared by far not all drivers.
Signed-off-by: Alexander Sverdlin <alexander.sverdlin@xxxxxxxxx>
---
sound/soc/cirrus/ep93xx-i2s.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/sound/soc/cirrus/ep93xx-i2s.c b/sound/soc/cirrus/ep93xx-i2s.c
index 982151330c89..f41712df7994 100644
--- a/sound/soc/cirrus/ep93xx-i2s.c
+++ b/sound/soc/cirrus/ep93xx-i2s.c
@@ -359,6 +359,8 @@ static int ep93xx_i2s_set_sysclk(struct snd_soc_dai *cpu_dai, int clk_id,
if (dir == SND_SOC_CLOCK_IN || clk_id != 0)
return -EINVAL;
+ if (!freq)
+ return 0;
return clk_set_rate(info->mclk, freq);
}
--
2.39.1
