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Daniel Thompson b97eb924a2 irqchip/exiu: Fix acknowledgment of edge triggered interrupts 
[ Upstream commit 4efc851c36e389f7ed432edac0149acc5f94b0c7 ]

Currently the EXIU uses the fasteoi interrupt flow that is configured by
it's parent (irq-gic-v3.c). With this flow the only chance to clear the
interrupt request happens during .irq_eoi() and (obviously) this happens
after the interrupt handler has run. EXIU requires edge triggered
interrupts to be acked prior to interrupt handling. Without this we
risk incorrect interrupt dismissal when a new interrupt is delivered
after the handler reads and acknowledges the peripheral but before the
irq_eoi() takes place.

Fix this by clearing the interrupt request from .irq_ack() if we are
configured for edge triggered interrupts. This requires adopting the
fasteoi-ack flow instead of the fasteoi to ensure the ack gets called.

These changes have been tested using the power button on a
Developerbox/SC2A11 combined with some hackery in gpio-keys so I can
play with the different trigger mode [and an mdelay(500) so I can
can check what happens on a double click in both modes].

Fixes: 706cffc1b9 ("irqchip/exiu: Add support for Socionext Synquacer EXIU controller")
Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>
Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20220503134541.2566457-1-daniel.thompson@linaro.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
2022-06-14 18:11:35 +02:00
arch irqchip/exiu: Fix acknowledgment of edge triggered interrupts 2022-06-14 18:11:35 +02:00
block
certs
crypto
Documentation
drivers irqchip/exiu: Fix acknowledgment of edge triggered interrupts 2022-06-14 18:11:35 +02:00
fs fsnotify: fix wrong lockdep annotations 2022-06-14 18:11:34 +02:00
include x86/speculation: Add missing prototype for unpriv_ebpf_notify() 2022-06-14 18:11:34 +02:00
init
ipc
kernel sched/fair: Fix cfs_rq_clock_pelt() for throttled cfs_rq 2022-06-14 18:11:33 +02:00
lib
LICENSES
mm
net NFC: NULL out the dev->rfkill to prevent UAF 2022-06-14 18:11:33 +02:00
samples
scripts
security
sound ASoC: rk3328: fix disabling mclk on pclk probe failure 2022-06-14 18:11:34 +02:00
tools perf tools: Add missing headers needed by util/data.h 2022-06-14 18:11:34 +02:00
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README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.