1. 28 8月, 2020 1 次提交
    • K
      ASoC: soc-core: add snd_soc_find_dai_with_mutex() · 20d9fdee
      Kuninori Morimoto 提交于
      commit 25612477 ("ASoC: soc-dai: set dai_link dpcm_ flags with a helper")
      added snd_soc_dai_link_set_capabilities().
      But it is using snd_soc_find_dai() (A) which is required client_mutex (B).
      And client_mutex is soc-core.c local.
      
      	struct snd_soc_dai *snd_soc_find_dai(xxx)
      	{
      		...
      (B)		lockdep_assert_held(&client_mutex);
      		...
      	}
      
      	void snd_soc_dai_link_set_capabilities(xxx)
      	{
      		...
      		for_each_pcm_streams(direction) {
      			...
      			for_each_link_cpus(dai_link, i, cpu) {
      (A)				dai = snd_soc_find_dai(cpu);
      				...
      			}
      			...
      			for_each_link_codecs(dai_link, i, codec) {
      (A)				dai = snd_soc_find_dai(codec);
      				...
      			}
      		}
      		...
      	}
      
      Because of these background, we will get WARNING if .config has CONFIG_LOCKDEP.
      
      	WARNING: CPU: 2 PID: 53 at sound/soc/soc-core.c:814 snd_soc_find_dai+0xf8/0x100
      	CPU: 2 PID: 53 Comm: kworker/2:1 Not tainted 5.7.0-rc1+ #328
      	Hardware name: Renesas H3ULCB Kingfisher board based on r8a77951 (DT)
      	Workqueue: events deferred_probe_work_func
      	pstate: 60000005 (nZCv daif -PAN -UAO)
      	pc : snd_soc_find_dai+0xf8/0x100
      	lr : snd_soc_find_dai+0xf4/0x100
      	...
      	Call trace:
      	 snd_soc_find_dai+0xf8/0x100
      	 snd_soc_dai_link_set_capabilities+0xa0/0x16c
      	 graph_dai_link_of_dpcm+0x390/0x3c0
      	 graph_for_each_link+0x134/0x200
      	 graph_probe+0x144/0x230
      	 platform_drv_probe+0x5c/0xb0
      	 really_probe+0xe4/0x430
      	 driver_probe_device+0x60/0xf4
      
      snd_soc_find_dai() will be used from (X) CPU/Codec/Platform driver with
      mutex lock, and (Y) Card driver without mutex lock.
      This snd_soc_dai_link_set_capabilities() is for Card driver,
      this means called without mutex.
      This patch adds snd_soc_find_dai_with_mutex() to solve it.
      
      Fixes: 25612477 ("ASoC: soc-dai: set dai_link dpcm_ flags with a helper")
      Signed-off-by: NKuninori Morimoto <kuninori.morimoto.gx@renesas.com>
      Link: https://lore.kernel.org/r/87blixvuab.wl-kuninori.morimoto.gx@renesas.comSigned-off-by: NMark Brown <broonie@kernel.org>
      20d9fdee
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