linux-kernel - [PATCH 0/2] Use raw spinlocks in the ls-extirq driver

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Date:   Wed, 25 Aug 2021 23:50:39 +0300
From:   Vladimir Oltean <vladimir.oltean@....com>
To:     Mark Brown <broonie@...nel.org>
Cc:     Rasmus Villemoes <linux@...musvillemoes.dk>,
        Lee Jones <lee.jones@...aro.org>,
        Arnd Bergmann <arnd@...db.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Marc Zyngier <maz@...nel.org>,
        Hou Zhiqiang <Zhiqiang.Hou@....com>,
        Biwen Li <biwen.li@....com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 0/2] Use raw spinlocks in the ls-extirq driver

The ls-extirq irqchip driver accesses regmap inside its implementation
of the struct irq_chip :: irq_set_type method, and currently regmap
only knows to lock using normal spinlocks. But the method above wants
raw spinlock context, so this isn't going to work and triggers a
"[ BUG: Invalid wait context ]" splat.

The best we can do given the arrangement of the code is to patch regmap
and the syscon driver: regmap to support raw spinlocks, and syscon to
request them on behalf of its ls-extirq consumer.

Link: https://lore.kernel.org/lkml/20210825135438.ubcuxm5vctt6ne2q@skbuf/T/#u

Vladimir Oltean (2):
  regmap: teach regmap to use raw spinlocks if requested in the config
  mfd: syscon: request a regmap with raw spinlocks for some devices

 drivers/base/regmap/internal.h |  4 ++++
 drivers/base/regmap/regmap.c   | 35 +++++++++++++++++++++++++++++-----
 drivers/mfd/syscon.c           | 16 ++++++++++++++++
 include/linux/regmap.h         |  2 ++
 4 files changed, 52 insertions(+), 5 deletions(-)

-- 
2.25.1