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From: Hans de Goede <hdegoede@redhat.com>
To: Lee Jones <lee.jones@linaro.org>,
	MyungJoo Ham <myungjoo.ham@samsung.com>,
	Chanwoo Choi <cw00.choi@samsung.com>,
	Cezary Rojewski <cezary.rojewski@intel.com>,
	Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>,
	Liam Girdwood <liam.r.girdwood@linux.intel.com>,
	Jie Yang <yang.jie@linux.intel.com>,
	Mark Brown <broonie@kernel.org>
Cc: Hans de Goede <hdegoede@redhat.com>,
	patches@opensource.cirrus.com, linux-kernel@vger.kernel.org,
	alsa-devel@alsa-project.org
Subject: [PATCH 06/14] extcon: arizona: Fix various races on driver unbind
Date: Sun, 27 Dec 2020 22:12:24 +0100	[thread overview]
Message-ID: <20201227211232.117801-7-hdegoede@redhat.com> (raw)
In-Reply-To: <20201227211232.117801-1-hdegoede@redhat.com>

We must free/disable all interrupts and cancel all pending works
before doing further cleanup.

Before this commit arizona_extcon_remove() was doing several
register writes to shut things down before disabling the IRQs
and it was cancelling only 1 of the 3 different works used.

Move all the register-writes shutting things down to after
the disabling of the IRQs and add the 2 missing
cancel_delayed_work_sync() calls.

This fixes various possible races on driver unbind. One of which
would always trigger on devices using the mic-clamp feature for
jack detection. The ARIZONA_MICD_CLAMP_MODE_MASK update was
done before disabling the IRQs, causing:
1. arizona_jackdet() to run
2. detect a jack being inserted (clamp disabled means jack inserted)
3. call arizona_start_mic() which:
3.1 Enables the MICVDD regulator
3.2 takes a pm_runtime_reference

And this was all happening after the ARIZONA_MICD_ENA bit clearing,
which would undo 3.1 and 3.2 because the ARIZONA_MICD_CLAMP_MODE_MASK
update was being done after the ARIZONA_MICD_ENA bit clearing.

So this means that arizona_extcon_remove() would exit with
1. MICVDD enabled and 2. The pm_runtime_reference being unbalanced.

MICVDD still being enabled caused the following oops when the
regulator is released by the devm framework:

[ 2850.745757] ------------[ cut here ]------------
[ 2850.745827] WARNING: CPU: 2 PID: 2098 at drivers/regulator/core.c:2123 _regulator_put.part.0+0x19f/0x1b0
[ 2850.745835] Modules linked in: extcon_arizona ...
...
[ 2850.746909] Call Trace:
[ 2850.746932]  regulator_put+0x2d/0x40
[ 2850.746946]  release_nodes+0x22a/0x260
[ 2850.746984]  __device_release_driver+0x190/0x240
[ 2850.747002]  driver_detach+0xd4/0x120
...
[ 2850.747337] ---[ end trace f455dfd7abd9781f ]---

Note this oops is just one of various theoretically possible races caused
by the wrong ordering inside arizona_extcon_remove(), this fixes the
ordering fixing all possible races, including the reported oops.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
 drivers/extcon/extcon-arizona.c | 40 +++++++++++++++++----------------
 1 file changed, 21 insertions(+), 19 deletions(-)

diff --git a/drivers/extcon/extcon-arizona.c b/drivers/extcon/extcon-arizona.c
index f7ef247de46a..76aacbac5869 100644
--- a/drivers/extcon/extcon-arizona.c
+++ b/drivers/extcon/extcon-arizona.c
@@ -1760,25 +1760,6 @@ static int arizona_extcon_remove(struct platform_device *pdev)
 	bool change;
 	int ret;
 
-	ret = regmap_update_bits_check(arizona->regmap, ARIZONA_MIC_DETECT_1,
-				       ARIZONA_MICD_ENA, 0,
-				       &change);
-	if (ret < 0) {
-		dev_err(&pdev->dev, "Failed to disable micd on remove: %d\n",
-			ret);
-	} else if (change) {
-		regulator_disable(info->micvdd);
-		pm_runtime_put(info->dev);
-	}
-
-	gpiod_put(info->micd_pol_gpio);
-
-	pm_runtime_disable(&pdev->dev);
-
-	regmap_update_bits(arizona->regmap,
-			   ARIZONA_MICD_CLAMP_CONTROL,
-			   ARIZONA_MICD_CLAMP_MODE_MASK, 0);
-
 	if (info->micd_clamp) {
 		jack_irq_rise = ARIZONA_IRQ_MICD_CLAMP_RISE;
 		jack_irq_fall = ARIZONA_IRQ_MICD_CLAMP_FALL;
@@ -1794,10 +1775,31 @@ static int arizona_extcon_remove(struct platform_device *pdev)
 	arizona_free_irq(arizona, jack_irq_rise, info);
 	arizona_free_irq(arizona, jack_irq_fall, info);
 	cancel_delayed_work_sync(&info->hpdet_work);
+	cancel_delayed_work_sync(&info->micd_detect_work);
+	cancel_delayed_work_sync(&info->micd_timeout_work);
+
+	ret = regmap_update_bits_check(arizona->regmap, ARIZONA_MIC_DETECT_1,
+				       ARIZONA_MICD_ENA, 0,
+				       &change);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "Failed to disable micd on remove: %d\n",
+			ret);
+	} else if (change) {
+		regulator_disable(info->micvdd);
+		pm_runtime_put(info->dev);
+	}
+
+	regmap_update_bits(arizona->regmap,
+			   ARIZONA_MICD_CLAMP_CONTROL,
+			   ARIZONA_MICD_CLAMP_MODE_MASK, 0);
 	regmap_update_bits(arizona->regmap, ARIZONA_JACK_DETECT_ANALOGUE,
 			   ARIZONA_JD1_ENA, 0);
 	arizona_clk32k_disable(arizona);
 
+	gpiod_put(info->micd_pol_gpio);
+
+	pm_runtime_disable(&pdev->dev);
+
 	return 0;
 }
 
-- 
2.28.0


WARNING: multiple messages have this Message-ID (diff)
From: Hans de Goede <hdegoede@redhat.com>
To: Lee Jones <lee.jones@linaro.org>,
	MyungJoo Ham <myungjoo.ham@samsung.com>,
	Chanwoo Choi <cw00.choi@samsung.com>,
	Cezary Rojewski <cezary.rojewski@intel.com>,
	Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>,
	Liam Girdwood <liam.r.girdwood@linux.intel.com>,
	Jie Yang <yang.jie@linux.intel.com>,
	Mark Brown <broonie@kernel.org>
Cc: Hans de Goede <hdegoede@redhat.com>,
	alsa-devel@alsa-project.org, linux-kernel@vger.kernel.org,
	patches@opensource.cirrus.com
Subject: [PATCH 06/14] extcon: arizona: Fix various races on driver unbind
Date: Sun, 27 Dec 2020 22:12:24 +0100	[thread overview]
Message-ID: <20201227211232.117801-7-hdegoede@redhat.com> (raw)
In-Reply-To: <20201227211232.117801-1-hdegoede@redhat.com>

We must free/disable all interrupts and cancel all pending works
before doing further cleanup.

Before this commit arizona_extcon_remove() was doing several
register writes to shut things down before disabling the IRQs
and it was cancelling only 1 of the 3 different works used.

Move all the register-writes shutting things down to after
the disabling of the IRQs and add the 2 missing
cancel_delayed_work_sync() calls.

This fixes various possible races on driver unbind. One of which
would always trigger on devices using the mic-clamp feature for
jack detection. The ARIZONA_MICD_CLAMP_MODE_MASK update was
done before disabling the IRQs, causing:
1. arizona_jackdet() to run
2. detect a jack being inserted (clamp disabled means jack inserted)
3. call arizona_start_mic() which:
3.1 Enables the MICVDD regulator
3.2 takes a pm_runtime_reference

And this was all happening after the ARIZONA_MICD_ENA bit clearing,
which would undo 3.1 and 3.2 because the ARIZONA_MICD_CLAMP_MODE_MASK
update was being done after the ARIZONA_MICD_ENA bit clearing.

So this means that arizona_extcon_remove() would exit with
1. MICVDD enabled and 2. The pm_runtime_reference being unbalanced.

MICVDD still being enabled caused the following oops when the
regulator is released by the devm framework:

[ 2850.745757] ------------[ cut here ]------------
[ 2850.745827] WARNING: CPU: 2 PID: 2098 at drivers/regulator/core.c:2123 _regulator_put.part.0+0x19f/0x1b0
[ 2850.745835] Modules linked in: extcon_arizona ...
...
[ 2850.746909] Call Trace:
[ 2850.746932]  regulator_put+0x2d/0x40
[ 2850.746946]  release_nodes+0x22a/0x260
[ 2850.746984]  __device_release_driver+0x190/0x240
[ 2850.747002]  driver_detach+0xd4/0x120
...
[ 2850.747337] ---[ end trace f455dfd7abd9781f ]---

Note this oops is just one of various theoretically possible races caused
by the wrong ordering inside arizona_extcon_remove(), this fixes the
ordering fixing all possible races, including the reported oops.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
 drivers/extcon/extcon-arizona.c | 40 +++++++++++++++++----------------
 1 file changed, 21 insertions(+), 19 deletions(-)

diff --git a/drivers/extcon/extcon-arizona.c b/drivers/extcon/extcon-arizona.c
index f7ef247de46a..76aacbac5869 100644
--- a/drivers/extcon/extcon-arizona.c
+++ b/drivers/extcon/extcon-arizona.c
@@ -1760,25 +1760,6 @@ static int arizona_extcon_remove(struct platform_device *pdev)
 	bool change;
 	int ret;
 
-	ret = regmap_update_bits_check(arizona->regmap, ARIZONA_MIC_DETECT_1,
-				       ARIZONA_MICD_ENA, 0,
-				       &change);
-	if (ret < 0) {
-		dev_err(&pdev->dev, "Failed to disable micd on remove: %d\n",
-			ret);
-	} else if (change) {
-		regulator_disable(info->micvdd);
-		pm_runtime_put(info->dev);
-	}
-
-	gpiod_put(info->micd_pol_gpio);
-
-	pm_runtime_disable(&pdev->dev);
-
-	regmap_update_bits(arizona->regmap,
-			   ARIZONA_MICD_CLAMP_CONTROL,
-			   ARIZONA_MICD_CLAMP_MODE_MASK, 0);
-
 	if (info->micd_clamp) {
 		jack_irq_rise = ARIZONA_IRQ_MICD_CLAMP_RISE;
 		jack_irq_fall = ARIZONA_IRQ_MICD_CLAMP_FALL;
@@ -1794,10 +1775,31 @@ static int arizona_extcon_remove(struct platform_device *pdev)
 	arizona_free_irq(arizona, jack_irq_rise, info);
 	arizona_free_irq(arizona, jack_irq_fall, info);
 	cancel_delayed_work_sync(&info->hpdet_work);
+	cancel_delayed_work_sync(&info->micd_detect_work);
+	cancel_delayed_work_sync(&info->micd_timeout_work);
+
+	ret = regmap_update_bits_check(arizona->regmap, ARIZONA_MIC_DETECT_1,
+				       ARIZONA_MICD_ENA, 0,
+				       &change);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "Failed to disable micd on remove: %d\n",
+			ret);
+	} else if (change) {
+		regulator_disable(info->micvdd);
+		pm_runtime_put(info->dev);
+	}
+
+	regmap_update_bits(arizona->regmap,
+			   ARIZONA_MICD_CLAMP_CONTROL,
+			   ARIZONA_MICD_CLAMP_MODE_MASK, 0);
 	regmap_update_bits(arizona->regmap, ARIZONA_JACK_DETECT_ANALOGUE,
 			   ARIZONA_JD1_ENA, 0);
 	arizona_clk32k_disable(arizona);
 
+	gpiod_put(info->micd_pol_gpio);
+
+	pm_runtime_disable(&pdev->dev);
+
 	return 0;
 }
 
-- 
2.28.0


  parent reply	other threads:[~2020-12-27 21:14 UTC|newest]

Thread overview: 106+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-12-27 21:12 [PATCH 00/14] MFD/extcon/ASoC: Add support for Intel Bay Trail boards with WM5102 codec Hans de Goede
2020-12-27 21:12 ` Hans de Goede
2020-12-27 21:12 ` [PATCH 01/14] mfd: arizona: Add jack pointer to struct arizona Hans de Goede
2020-12-27 21:12   ` Hans de Goede
2020-12-28 12:21   ` Mark Brown
2020-12-28 12:21     ` Mark Brown
2020-12-28 13:16     ` Hans de Goede
2020-12-28 13:16       ` Hans de Goede
2020-12-28 16:28       ` Mark Brown
2020-12-28 16:28         ` Mark Brown
2020-12-29 13:06         ` Charles Keepax
2020-12-29 13:06           ` Charles Keepax
2020-12-29 13:57           ` Hans de Goede
2020-12-29 13:57             ` Hans de Goede
2020-12-29 15:06             ` Charles Keepax
2020-12-29 15:06               ` Charles Keepax
2020-12-29 15:15               ` Mark Brown
2020-12-29 15:15                 ` Mark Brown
2020-12-29 15:40                 ` Hans de Goede
2020-12-29 15:40                   ` Hans de Goede
2020-12-29 16:51                   ` Richard Fitzgerald
2020-12-29 16:51                     ` Richard Fitzgerald
2020-12-30 11:04                     ` Hans de Goede
2020-12-30 11:04                       ` Hans de Goede
2020-12-30 11:23                       ` Richard Fitzgerald
2020-12-30 11:23                         ` Richard Fitzgerald
2020-12-30 12:01                         ` Hans de Goede
2020-12-30 12:01                           ` Hans de Goede
2020-12-30 13:16                     ` Mark Brown
2020-12-30 13:16                       ` Mark Brown
2020-12-29 16:43               ` Richard Fitzgerald
2020-12-29 16:43                 ` Richard Fitzgerald
2020-12-29 15:08             ` Mark Brown
2020-12-29 15:08               ` Mark Brown
2020-12-29 15:33               ` Hans de Goede
2020-12-29 15:33                 ` Hans de Goede
2020-12-30 13:38                 ` Mark Brown
2020-12-30 13:38                   ` Mark Brown
2021-01-01 13:24                   ` Hans de Goede
2021-01-01 13:24                     ` Hans de Goede
2020-12-27 21:12 ` [PATCH 02/14] mfd: arizona: Add MODULE_SOFTDEP("pre: arizona_ldo1") Hans de Goede
2020-12-27 21:12   ` Hans de Goede
2020-12-29 11:40   ` Charles Keepax
2020-12-29 11:40     ` Charles Keepax
2020-12-27 21:12 ` [PATCH 03/14] mfd: arizona: Add support for ACPI enumeration of WM5102 connected over SPI Hans de Goede
2020-12-27 21:12   ` Hans de Goede
2020-12-28  1:21   ` kernel test robot
2020-12-28  1:21     ` kernel test robot
2020-12-28  1:21   ` [RFC PATCH] mfd: arizona: ldoena_gpios can be static kernel test robot
2020-12-28  1:21     ` kernel test robot
2020-12-28 14:14   ` [PATCH 03/14] mfd: arizona: Add support for ACPI enumeration of WM5102 connected over SPI Andy Shevchenko
2020-12-28 14:14     ` Andy Shevchenko
2021-01-16 14:46     ` Hans de Goede
2021-01-16 14:46       ` Hans de Goede
2020-12-28 22:11   ` kernel test robot
2020-12-28 22:11     ` kernel test robot
2020-12-28 22:29   ` kernel test robot
2020-12-28 22:29     ` kernel test robot
2020-12-27 21:12 ` [PATCH 04/14] mfd: arizona: Allow building arizona MFD-core as module Hans de Goede
2020-12-27 21:12   ` Hans de Goede
2020-12-29 12:00   ` Charles Keepax
2020-12-29 12:00     ` Charles Keepax
2021-01-11 19:12     ` Hans de Goede
2021-01-11 19:12       ` Hans de Goede
2020-12-27 21:12 ` [PATCH 05/14] extcon: arizona: Fix some issues when HPDET IRQ fires after the jack has been unplugged Hans de Goede
2020-12-27 21:12   ` Hans de Goede
2020-12-27 21:12 ` Hans de Goede [this message]
2020-12-27 21:12   ` [PATCH 06/14] extcon: arizona: Fix various races on driver unbind Hans de Goede
2020-12-29 12:10   ` Charles Keepax
2020-12-29 12:10     ` Charles Keepax
2020-12-27 21:12 ` [PATCH 07/14] extcon: arizona: Fix modalias Hans de Goede
2020-12-27 21:12   ` Hans de Goede
2020-12-29 12:10   ` Charles Keepax
2020-12-29 12:10     ` Charles Keepax
2020-12-27 21:12 ` [PATCH 08/14] extcon: arizona: Fix flags parameter to the gpiod_get("wlf,micd-pol") call Hans de Goede
2020-12-27 21:12   ` [PATCH 08/14] extcon: arizona: Fix flags parameter to the gpiod_get("wlf, micd-pol") call Hans de Goede
2020-12-29 12:12   ` [PATCH 08/14] extcon: arizona: Fix flags parameter to the gpiod_get("wlf,micd-pol") call Charles Keepax
2020-12-29 12:12     ` Charles Keepax
2020-12-27 21:12 ` [PATCH 09/14] extcon: arizona: Add arizona_set_extcon_state() helper Hans de Goede
2020-12-27 21:12   ` Hans de Goede
2020-12-29 12:57   ` Charles Keepax
2020-12-29 12:57     ` Charles Keepax
2020-12-27 21:12 ` [PATCH 10/14] extcon: arizona: Also report jack state through snd_soc_jack_report() Hans de Goede
2020-12-27 21:12   ` Hans de Goede
2020-12-28 14:16   ` Andy Shevchenko
2020-12-28 14:16     ` Andy Shevchenko
2020-12-27 21:12 ` [PATCH 11/14] extcon: arizona: Use ASoC jack input-device when available Hans de Goede
2020-12-27 21:12   ` Hans de Goede
2020-12-27 21:12 ` [PATCH 12/14] ASoC: Intel: Add DMI quirk table to soc_intel_is_byt_cr() Hans de Goede
2020-12-27 21:12   ` Hans de Goede
2021-01-11 17:52   ` Pierre-Louis Bossart
2021-01-11 17:52     ` Pierre-Louis Bossart
2020-12-27 21:12 ` [PATCH 13/14] ASoC: Intel: bytcr_wm5102: Add machine driver for BYT/WM5102 Hans de Goede
2020-12-27 21:12   ` Hans de Goede
2020-12-29 13:58   ` Charles Keepax
2020-12-29 13:58     ` Charles Keepax
2021-01-11 17:54     ` Pierre-Louis Bossart
2021-01-11 17:54       ` Pierre-Louis Bossart
2021-01-16 16:49     ` Hans de Goede
2021-01-16 16:49       ` Hans de Goede
2020-12-27 21:12 ` [PATCH 14/14] ASoC: Intel: bytcr_wm5102: Add jack detect support Hans de Goede
2020-12-27 21:12   ` Hans de Goede
2020-12-28 14:19 ` [PATCH 00/14] MFD/extcon/ASoC: Add support for Intel Bay Trail boards with WM5102 codec Andy Shevchenko
2020-12-28 14:19   ` Andy Shevchenko
2021-01-11 18:54   ` Hans de Goede
2021-01-11 18:54     ` Hans de Goede

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