ASoC: ep93xx: ignore 0 Hz sysclk
Commit2458adb8f9
("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 commitf1879d7b98
("ASoC: rockchip: ignore 0Hz sysclk"), but it prepared by far not all drivers. Signed-off-by: Alexander Sverdlin <alexander.sverdlin@gmail.com> Link: https://lore.kernel.org/r/20230212220923.258414-1-alexander.sverdlin@gmail.com Signed-off-by: Mark Brown <broonie@kernel.org>
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@ -359,6 +359,8 @@ static int ep93xx_i2s_set_sysclk(struct snd_soc_dai *cpu_dai, int clk_id,
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if (dir == SND_SOC_CLOCK_IN || clk_id != 0)
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return -EINVAL;
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if (!freq)
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return 0;
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return clk_set_rate(info->mclk, freq);
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}
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