This is a note to let you know that I've just added the patch titled
extcon: arizona: Fix various races on driver unbind
to the 5.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
extcon-arizona-fix-various-races-on-driver-unbind.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 9b1b6d2215b6dbbb07cb56fdbd46a7ac84cc557c
Author: Hans de Goede <hdegoede@xxxxxxxxxx>
Date: Sun Mar 7 16:17:57 2021 +0100
extcon: arizona: Fix various races on driver unbind
[ Upstream commit e5b499f6fb17bc95a813e85d0796522280203806 ]
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@xxxxxxxxxx>
Reviewed-by: Andy Shevchenko <andy.shevchenko@xxxxxxxxx>
Acked-by: Charles Keepax <ckeepax@xxxxxxxxxxxxxxxxxxxxx>
Tested-by: Charles Keepax <ckeepax@xxxxxxxxxxxxxxxxxxxxx>
Acked-by: Chanwoo Choi <cw00.choi@xxxxxxxxxxx>
Signed-off-by: Lee Jones <lee.jones@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/extcon/extcon-arizona.c b/drivers/extcon/extcon-arizona.c
index 7f1cd61443ff..9a6103ac7118 100644
--- a/drivers/extcon/extcon-arizona.c
+++ b/drivers/extcon/extcon-arizona.c
@@ -1725,25 +1725,6 @@ 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;
@@ -1759,10 +1740,31 @@ 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;
}
