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linux-stable/drivers/pinctrl/mvebu
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Vladimir Oltean 4546760619 pinctrl: armada-37xx: use raw spinlocks for regmap to avoid invalid wait context 
The irqchip->irq_set_type method is called by __irq_set_trigger() under
the desc->lock raw spinlock.

The armada-37xx implementation, armada_37xx_irq_set_type(), uses an MMIO
regmap created by of_syscon_register(), which uses plain spinlocks
(the kind that are sleepable on RT).

Therefore, this is an invalid locking scheme for which we get a kernel
splat stating just that ("[ BUG: Invalid wait context ]"), because the
context in which the plain spinlock may sleep is atomic due to the raw
spinlock. We need to go raw spinlocks all the way.

Make this driver create its own MMIO regmap, with use_raw_spinlock=true,
and stop relying on syscon to provide it.

This patch depends on commit 67021f25d9 ("regmap: teach regmap to use
raw spinlocks if requested in the config").

Cc: <stable@vger.kernel.org> # 5.15+
Fixes: 2f22760539 ("pinctrl: armada-37xx: Add irqchip support")
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Link: https://lore.kernel.org/r/20220716233745.1704677-3-vladimir.oltean@nxp.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2022-07-19 00:57:38 +02:00
..
Kconfig pinctrl: mvebu: pinctrl driver for 98DX2530 SoC 2022-04-18 01:15:34 +02:00
Makefile pinctrl: mvebu: pinctrl driver for 98DX2530 SoC 2022-04-18 01:15:34 +02:00
pinctrl-ac5.c pinctrl: mvebu: pinctrl driver for 98DX2530 SoC 2022-04-18 01:15:34 +02:00
pinctrl-armada-37xx.c pinctrl: armada-37xx: use raw spinlocks for regmap to avoid invalid wait context 2022-07-19 00:57:38 +02:00
pinctrl-armada-38x.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
pinctrl-armada-39x.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
pinctrl-armada-370.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
pinctrl-armada-375.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
pinctrl-armada-ap806.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
pinctrl-armada-cp110.c pinctrl: armada-cp110 - fix MPP54/MPP55 functions 2021-03-10 14:41:12 +01:00
pinctrl-armada-xp.c pinctrl: mvebu: Fix i2c sda definition for 98DX3236 2020-09-12 18:14:39 +02:00
pinctrl-dove.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
pinctrl-kirkwood.c This is the bulk of pin control changes for the v5.3 kernel 2019-07-13 15:02:27 -07:00
pinctrl-mvebu.c pinctrl: mvebu: use devm_platform_ioremap_resource() to simplify code 2019-10-24 14:04:13 +02:00
pinctrl-mvebu.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
pinctrl-orion.c pinctrl: mvebu: use devm_platform_ioremap_resource() to simplify code 2019-10-24 14:04:13 +02:00