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Wed, 8 Jan 2020 11:50:27 +0000 (GMT) From: Marek Szyprowski To: alsa-devel@alsa-project.org, linux-kernel@vger.kernel.org, linux-samsung-soc@vger.kernel.org Date: Wed, 8 Jan 2020 12:50:07 +0100 Message-Id: <20200108115007.31095-2-m.szyprowski@samsung.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200108115007.31095-1-m.szyprowski@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFupjleLIzCtJLcpLzFFi42LZduznOV3mQ6JxBltvW1hcuXiIyWLjjPWs FlMfPmGzOHG4kdmifWYHo8X58xvYLS7vmsNmMeP8PiaLtUfuslscftPOarHn4it2B26PDZ+b 2DwWbCr12LSqk82jb8sqRo/Pm+QCWKO4bFJSczLLUov07RK4Mt7+vcBaMFuvYsO2IywNjFPU uhg5OSQETCQudM5h7GLk4hASWMEocezwdRYI5wujxOGn19ghnM+MEkdevWaFafn64xorRGI5 o8TmDYtY4Vo237zOBlLFJmAo0fW2C8wWEUiSOL/gNjNIEbPAZSaJ1Y39zCAJYQELiWffvwPZ HBwsAqoS9xurQMK8ArYSB2a8YYbYJi+xesMBsBJOATuJR0ug7m5nlzixIQzCdpG4daUZqlxY 4tXxLewQtozE/53zmUDWSgg0M0o8PLeWHcLpYZS43DSDEaLKWuLOuV9sIAuYBTQl1u/Shwg7 Smza/J4dJCwhwCdx460gSJgZyJy0bTozRJhXoqNNCKJaTWLW8XVwaw9euAR1jofE87MzoME7 kVFi7ZPnrBMY5WchLFvAyLiKUTy1tDg3PbXYKC+1XK84Mbe4NC9dLzk/dxMjMJWc/nf8yw7G XX+SDjEKcDAq8fD+WCwSJ8SaWFZcmXuIUYKDWUmEV0sHKMSbklhZlVqUH19UmpNafIhRmoNF SZzXeNHLWCGB9MSS1OzU1ILUIpgsEwenVAOj0Zq7R3M5ZbfVl1c2F3ZVtP+Rctpg97Rnwfzc p6uTJC73xa+SsG6J6O7W8mMM+XhBq/HD1n/n1T60Vh/gP27gM92XS+Lm59tdj5/KTdVV2d+Q GvS89JdZruy8BaaPn5oUy+8pXR+uUt3qsHH+lsDSP+6Gsb/mnJoVEG7qXJnYacCwZJrP8g9K LMUZiYZazEXFiQCSPfbeIQMAAA== X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFnrHLMWRmVeSWpSXmKPExsVy+t/xu7rMh0TjDJbdULa4cvEQk8XGGetZ LaY+fMJmceJwI7NF+8wORovz5zewW1zeNYfNYsb5fUwWa4/cZbc4/Kad1WLPxVfsDtweGz43 sXks2FTqsWlVJ5tH35ZVjB6fN8kFsEbp2RTll5akKmTkF5fYKkUbWhjpGVpa6BmZWOoZGpvH WhmZKunb2aSk5mSWpRbp2yXoZbz9e4G1YLZexYZtR1gaGKeodTFyckgImEh8/XGNFcQWEljK KLF7HhdEXEbi5LQGVghbWOLPtS62LkYuoJpPjBJ/ln4AS7AJGEp0vQVJcHKICKRI/JyxjhGk iFngJpPEj8XLmUESwgIWEs++fweyOThYBFQl7jdWgYR5BWwlDsx4wwyxQF5i9YYDYCWcAnYS j5aoQdxjK7H76ATmCYx8CxgZVjGKpJYW56bnFhvqFSfmFpfmpesl5+duYgSG9bZjPzfvYLy0 MfgQowAHoxIP74/FInFCrIllxZW5hxglOJiVRHi1dIBCvCmJlVWpRfnxRaU5qcWHGE2BTprI LCWanA+MubySeENTQ3MLS0NzY3NjMwslcd4OgYMxQgLpiSWp2ampBalFMH1MHJxSDYxCk0x2 Vi8o2OReIHbsw1rf3dYhOWmd6cI501Pj2247hcQvuHA6QqYzad1GkVde2Q0xvAqr6zqvN7ye liC4sf3M4zfml9c8qolbHTYvrapukdCvk/VtgZIVTxbdyTx5VVxN69D1X70zmWxt7bJYA+1y 5wgKHU9W/vabM5+Z55RHdl5MrKPpcSWW4oxEQy3mouJEAM1aaCyBAgAA X-CMS-MailID: 20200108115027eucas1p1d3645ba53703780679c662921efbca78 X-Msg-Generator: CA X-RootMTR: 20200108115027eucas1p1d3645ba53703780679c662921efbca78 X-EPHeader: CA CMS-TYPE: 201P X-CMS-RootMailID: 20200108115027eucas1p1d3645ba53703780679c662921efbca78 References: <20200108115007.31095-1-m.szyprowski@samsung.com> Cc: Jimmy Cheng-Yi Chiang , Bartlomiej Zolnierkiewicz , Krzysztof Kozlowski , Tzung-Bi Shih , Mark Brown , Sylwester Nawrocki , Dylan Reid , Marek Szyprowski Subject: [alsa-devel] [PATCH 2/2] ASoC: max98090: fix lockdep warning X-BeenThere: alsa-devel@alsa-project.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: alsa-devel-bounces@alsa-project.org Sender: "Alsa-devel" Commit 62d5ae4cafb7 ("ASoC: max98090: save and restore SHDN when changing sensitive registers") extended the code for handling many controls by adding a custom put function to them. That new custom put function properly handles relations between codec's hardware registers. However they used card->dapm_mutex to properly serialize those operations. This in turn triggers a lockdep warning about possible circular dependency. Fix this by introducing a separate mutex only for serializing the SHDN hardware register related operations. This fixes the following lockdep warning observed on Exynos4412-based Odroid U3 board: -- 2.17.1 _______________________________________________ Alsa-devel mailing list Alsa-devel@alsa-project.org https://mailman.alsa-project.org/mailman/listinfo/alsa-devel ====================================================== WARNING: possible circular locking dependency detected 5.5.0-rc5-next-20200107 #166 Not tainted ------------------------------------------------------ alsactl/1104 is trying to acquire lock: ed0d50f4 (&card->dapm_mutex){+.+.}, at: max98090_shdn_save+0x1c/0x28 but task is already holding lock: edb4b49c (&card->controls_rwsem){++++}, at: snd_ctl_ioctl+0xcc/0xbb8 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&card->controls_rwsem){++++}: snd_ctl_add_replace+0x3c/0x84 dapm_create_or_share_kcontrol+0x24c/0x2e0 snd_soc_dapm_new_widgets+0x308/0x594 snd_soc_bind_card+0x80c/0xad4 devm_snd_soc_register_card+0x34/0x6c odroid_audio_probe+0x288/0x34c platform_drv_probe+0x6c/0xa4 really_probe+0x200/0x490 driver_probe_device+0x78/0x1f8 bus_for_each_drv+0x74/0xb8 __device_attach+0xd4/0x16c bus_probe_device+0x88/0x90 deferred_probe_work_func+0x3c/0xd0 process_one_work+0x22c/0x7c4 worker_thread+0x44/0x524 kthread+0x130/0x164 ret_from_fork+0x14/0x20 0x0 -> #0 (&card->dapm_mutex){+.+.}: lock_acquire+0xe8/0x270 __mutex_lock+0x9c/0xb18 mutex_lock_nested+0x1c/0x24 max98090_shdn_save+0x1c/0x28 max98090_put_enum_double+0x20/0x40 snd_ctl_ioctl+0x190/0xbb8 ksys_ioctl+0x470/0xaf8 ret_fast_syscall+0x0/0x28 0xbefaa564 other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&card->controls_rwsem); lock(&card->dapm_mutex); lock(&card->controls_rwsem); lock(&card->dapm_mutex); *** DEADLOCK *** 1 lock held by alsactl/1104: #0: edb4b49c (&card->controls_rwsem){++++}, at: snd_ctl_ioctl+0xcc/0xbb8 stack backtrace: CPU: 0 PID: 1104 Comm: alsactl Not tainted 5.5.0-rc5-next-20200107 #166 Hardware name: SAMSUNG EXYNOS (Flattened Device Tree) (unwind_backtrace) from [] (show_stack+0x10/0x14) (show_stack) from [] (dump_stack+0xb4/0xe0) (dump_stack) from [] (check_noncircular+0x1ec/0x208) (check_noncircular) from [] (__lock_acquire+0x1210/0x25ec) (__lock_acquire) from [] (lock_acquire+0xe8/0x270) (lock_acquire) from [] (__mutex_lock+0x9c/0xb18) (__mutex_lock) from [] (mutex_lock_nested+0x1c/0x24) (mutex_lock_nested) from [] (max98090_shdn_save+0x1c/0x28) (max98090_shdn_save) from [] (max98090_put_enum_double+0x20/0x40) (max98090_put_enum_double) from [] (snd_ctl_ioctl+0x190/0xbb8) (snd_ctl_ioctl) from [] (ksys_ioctl+0x470/0xaf8) (ksys_ioctl) from [] (ret_fast_syscall+0x0/0x28) ... Fixes: 62d5ae4cafb7 ("ASoC: max98090: save and restore SHDN when changing sensitive registers") Signed-off-by: Marek Szyprowski --- sound/soc/codecs/max98090.c | 10 ++++++---- sound/soc/codecs/max98090.h | 1 + 2 files changed, 7 insertions(+), 4 deletions(-) diff --git a/sound/soc/codecs/max98090.c b/sound/soc/codecs/max98090.c index c01ce4a3f86d..454cb8e5b0a1 100644 --- a/sound/soc/codecs/max98090.c +++ b/sound/soc/codecs/max98090.c @@ -52,14 +52,14 @@ static void max98090_shdn_restore_locked(struct max98090_priv *max98090) static void max98090_shdn_save(struct max98090_priv *max98090) { - mutex_lock(&max98090->component->card->dapm_mutex); + mutex_lock(&max98090->shdn_lock); max98090_shdn_save_locked(max98090); } static void max98090_shdn_restore(struct max98090_priv *max98090) { max98090_shdn_restore_locked(max98090); - mutex_unlock(&max98090->component->card->dapm_mutex); + mutex_unlock(&max98090->shdn_lock); } static int max98090_put_volsw(struct snd_kcontrol *kcontrol, @@ -2313,12 +2313,12 @@ static void max98090_pll_work(struct max98090_priv *max98090) */ /* Toggle shutdown OFF then ON */ - mutex_lock(&component->card->dapm_mutex); + mutex_lock(&max98090->shdn_lock); snd_soc_component_update_bits(component, M98090_REG_DEVICE_SHUTDOWN, M98090_SHDNN_MASK, 0); snd_soc_component_update_bits(component, M98090_REG_DEVICE_SHUTDOWN, M98090_SHDNN_MASK, M98090_SHDNN_MASK); - mutex_unlock(&component->card->dapm_mutex); + mutex_unlock(&max98090->shdn_lock); for (i = 0; i < 10; ++i) { /* Give PLL time to lock */ @@ -2731,6 +2731,8 @@ static int max98090_i2c_probe(struct i2c_client *i2c, if (max98090 == NULL) return -ENOMEM; + mutex_init(&max98090->shdn_lock); + if (ACPI_HANDLE(&i2c->dev)) { acpi_id = acpi_match_device(i2c->dev.driver->acpi_match_table, &i2c->dev); diff --git a/sound/soc/codecs/max98090.h b/sound/soc/codecs/max98090.h index 0a31708b7df7..dabd8be34a01 100644 --- a/sound/soc/codecs/max98090.h +++ b/sound/soc/codecs/max98090.h @@ -1539,6 +1539,7 @@ struct max98090_priv { unsigned int pa2en; unsigned int sidetone; bool master; + struct mutex shdn_lock; int saved_count; int saved_shdn; };