linux-kernel - [PATCH v3 0/19] irqdomain: fix mapping race and clean up locking

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Message-ID: <20221220033042.27724-1-mark-pk.tsai@mediatek.com>
Date:   Tue, 20 Dec 2022 11:30:42 +0800
From:   Mark-PK Tsai <mark-pk.tsai@...iatek.com>
To:     <johan+linaro@...nel.org>
CC:     <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linux-mips@...r.kernel.org>,
        <maz@...nel.org>, <platform-driver-x86@...r.kernel.org>,
        <tglx@...utronix.de>, <x86@...nel.org>, <yj.chiang@...iatek.com>,
        <phil.chang@...iatek.com>, <mark-pk.tsai@...iatek.com>
Subject: [PATCH v3 0/19] irqdomain: fix mapping race and clean up locking

> Parallel probing (e.g. due to asynchronous probing) of devices that
> share interrupts can currently result in two mappings for the same
> hardware interrupt to be created.
> 
> This series fixes this mapping race and clean up the irqdomain locking
> so that in the end the global irq_domain_mutex is only used for managing
> the likewise global irq_domain_list, while domain operations (e.g.
> IRQ allocations) use per-domain (hierarchy) locking.
> 
> Johan
> 
> 
> Changes in v2
>  - split out redundant-lookup cleanup (1/4)
>  - use a per-domain mutex to address mapping race (2/4)
>  - move kernel-doc to exported function (2/4)
>  - fix association race (3/4, new)
>  - use per-domain mutex for associations (4/4, new)
> 
> Changes in v3
>  - drop dead and bogus code (1--3/19, new)
>  - fix racy mapcount accesses (5/19, new)
>  - drop revmap mutex (6/19, new)
>  - use irq_domain_mutex to address mapping race (9/19)
>  - clean up irq_domain_push/pop_irq() (10/19, new)
>  - use irq_domain_create_hierarchy() to construct hierarchies
>    (11--18/19, new)
>  - switch to per-domain locking (19/19, new)
> 
> 
> Johan Hovold (19):
>   irqdomain: Drop bogus fwspec-mapping error handling
>   irqdomain: Drop dead domain-name assignment
>   irqdomain: Drop leftover brackets
>   irqdomain: Fix association race
>   irqdomain: Fix disassociation race
>   irqdomain: Drop revmap mutex
>   irqdomain: Look for existing mapping only once
>   irqdomain: Refactor __irq_domain_alloc_irqs()
>   irqdomain: Fix mapping-creation race
>   irqdomain: Clean up irq_domain_push/pop_irq()
>   x86/ioapic: Use irq_domain_create_hierarchy()
>   x86/apic: Use irq_domain_create_hierarchy()
>   irqchip/alpine-msi: Use irq_domain_add_hierarchy()
>   irqchip/gic-v2m: Use irq_domain_create_hierarchy()
>   irqchip/gic-v3-its: Use irq_domain_create_hierarchy()
>   irqchip/gic-v3-mbi: Use irq_domain_create_hierarchy()
>   irqchip/loongson-pch-msi: Use irq_domain_create_hierarchy()
>   irqchip/mvebu-odmi: Use irq_domain_create_hierarchy()
>   irqdomain: Switch to per-domain locking
> 
>  arch/x86/kernel/apic/io_apic.c         |   8 +-
>  arch/x86/platform/uv/uv_irq.c          |   7 +-
>  drivers/irqchip/irq-alpine-msi.c       |   8 +-
>  drivers/irqchip/irq-gic-v2m.c          |   5 +-
>  drivers/irqchip/irq-gic-v3-its.c       |  13 +-
>  drivers/irqchip/irq-gic-v3-mbi.c       |   5 +-
>  drivers/irqchip/irq-loongson-pch-msi.c |   9 +-
>  drivers/irqchip/irq-mvebu-odmi.c       |  13 +-
>  include/linux/irqdomain.h              |   6 +-
>  kernel/irq/irqdomain.c                 | 328 ++++++++++++++-----------
>  10 files changed, 220 insertions(+), 182 deletions(-)
> 
> -- 
> 2.37.4

Tested-by: Mark-PK Tsai <mark-pk.tsai@...iatek.com>

We have the same issue and this patch series fix that.
Thanks!

Link: https://lore.kernel.org/lkml/20221219130620.21092-1-mark-pk.tsai@mediatek.com/