From 4d230d12710646788af581ba0155d83ab48b955c Mon Sep 17 00:00:00 2001 From: Jiada Wang Date: Mon, 3 Sep 2018 07:08:58 +0000 Subject: ASoC: rsnd: fixup not to call clk_get/set under non-atomic Clocking operations clk_get/set_rate, are non-atomic, they shouldn't be called in soc_pcm_trigger() which is atomic. Following issue was found due to execution of clk_get_rate() causes sleep in soc_pcm_trigger(), which shouldn't be blocked. We can reproduce this issue by following > enable CONFIG_DEBUG_ATOMIC_SLEEP=y > compile, and boot > mount -t debugfs none /sys/kernel/debug > while true; do cat /sys/kernel/debug/clk/clk_summary > /dev/null; done & > while true; do aplay xxx; done This patch adds support to .prepare callback, and moves non-atomic clocking operations to it. As .prepare is non-atomic, it is always called before trigger_start/trigger_stop. BUG: sleeping function called from invalid context at kernel/locking/mutex.c:620 in_atomic(): 1, irqs_disabled(): 128, pid: 2242, name: aplay INFO: lockdep is turned off. irq event stamp: 5964 hardirqs last enabled at (5963): [] mutex_lock_nested+0x6e8/0x6f0 hardirqs last disabled at (5964): [] _raw_spin_lock_irqsave+0x24/0x68 softirqs last enabled at (5502): [] __do_softirq+0x560/0x10c0 softirqs last disabled at (5495): [] irq_exit+0x160/0x25c Preemption disabled at:[ 62.904063] [] snd_pcm_stream_lock+0xb4/0xc0 CPU: 2 PID: 2242 Comm: aplay Tainted: G B C 4.9.54+ #186 Hardware name: Renesas Salvator-X board based on r8a7795 (DT) Call trace: [] dump_backtrace+0x0/0x37c [] show_stack+0x14/0x1c [] dump_stack+0xfc/0x154 [] ___might_sleep+0x57c/0x58c [] __might_sleep+0x208/0x21c [] mutex_lock_nested+0xb4/0x6f0 [] clk_prepare_lock+0xb0/0x184 [] clk_core_get_rate+0x14/0x54 [] clk_get_rate+0x20/0x34 [] rsnd_adg_ssi_clk_try_start+0x158/0x4f8 [snd_soc_rcar] [] rsnd_ssi_init+0x668/0x7a0 [snd_soc_rcar] [] rsnd_soc_dai_trigger+0x4bc/0xcf8 [snd_soc_rcar] [] soc_pcm_trigger+0x2a4/0x2d4 Fixes: e7d850dd10f4 ("ASoC: rsnd: use mod base common method on SSI-parent") Signed-off-by: Jiada Wang Signed-off-by: Timo Wischer [Kuninori: tidyup for upstream] Signed-off-by: Kuninori Morimoto Tested-by: Hiroyuki Yokoyama Signed-off-by: Mark Brown Cc: stable@vger.kernel.org --- sound/soc/sh/rcar/rsnd.h | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'sound/soc/sh/rcar/rsnd.h') diff --git a/sound/soc/sh/rcar/rsnd.h b/sound/soc/sh/rcar/rsnd.h index 96d93330b1e1..8f7a0abfa751 100644 --- a/sound/soc/sh/rcar/rsnd.h +++ b/sound/soc/sh/rcar/rsnd.h @@ -280,6 +280,9 @@ struct rsnd_mod_ops { int (*nolock_stop)(struct rsnd_mod *mod, struct rsnd_dai_stream *io, struct rsnd_priv *priv); + int (*prepare)(struct rsnd_mod *mod, + struct rsnd_dai_stream *io, + struct rsnd_priv *priv); }; struct rsnd_dai_stream; @@ -309,6 +312,7 @@ struct rsnd_mod { * H 0: fallback * H 0: hw_params * H 0: pointer + * H 0: prepare */ #define __rsnd_mod_shift_nolock_start 0 #define __rsnd_mod_shift_nolock_stop 0 @@ -323,6 +327,7 @@ struct rsnd_mod { #define __rsnd_mod_shift_fallback 28 /* always called */ #define __rsnd_mod_shift_hw_params 28 /* always called */ #define __rsnd_mod_shift_pointer 28 /* always called */ +#define __rsnd_mod_shift_prepare 28 /* always called */ #define __rsnd_mod_add_probe 0 #define __rsnd_mod_add_remove 0 @@ -337,6 +342,7 @@ struct rsnd_mod { #define __rsnd_mod_add_fallback 0 #define __rsnd_mod_add_hw_params 0 #define __rsnd_mod_add_pointer 0 +#define __rsnd_mod_add_prepare 0 #define __rsnd_mod_call_probe 0 #define __rsnd_mod_call_remove 0 @@ -351,6 +357,7 @@ struct rsnd_mod { #define __rsnd_mod_call_pointer 0 #define __rsnd_mod_call_nolock_start 0 #define __rsnd_mod_call_nolock_stop 1 +#define __rsnd_mod_call_prepare 0 #define rsnd_mod_to_priv(mod) ((mod)->priv) #define rsnd_mod_name(mod) ((mod)->ops->name) -- cgit v1.2.1