From: Sudeep Holla <sudeep.holla@arm.com>
To: Marc Zyngier <maz@kernel.org>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
Hanjun Guo <guohanjun@huawei.com>,
dann frazier <dann.frazier@canonical.com>,
Fu Wei <wefu@redhat.com>, Len Brown <lenb@kernel.org>,
"Rafael J. Wysocki" <rjw@rjwysocki.net>,
linux-acpi@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, kernel-team@android.com,
Sudeep Holla <sudeep.holla@arm.com>
Subject: Re: [PATCH 2/2] ACPI: irq: Prevent unregistering of GIC SGIs
Date: Wed, 21 Apr 2021 18:15:16 +0100 [thread overview]
Message-ID: <20210421171516.hg3ex7jqigqjqa6i@bogus> (raw)
In-Reply-To: <20210421164317.1718831-3-maz@kernel.org>
On Wed, Apr 21, 2021 at 05:43:17PM +0100, Marc Zyngier wrote:
> When using ACPI on arm64, which implies the GIC IRQ model, no
> table should ever provide a GSI number in the range [0:15],
> as these are reserved for IPIs.
>
> However, drivers tend to call acpi_unregister_gsi() with any
> random GSI number provided by half baked tables, which results
> in an exploding kernel when its IPIs have been unconfigured.
>
> In order to catch this, check for the silly case early, warn
> that something is going wrong and avoid the above disaster.
>
Reviewed-by: Sudeep Holla <sudeep.holla@arm.com>
Just curious if this is just precaution or do we have a platform doing
something stupid like this ?
--
Regards,
Sudeep
WARNING: multiple messages have this Message-ID (diff)
From: Sudeep Holla <sudeep.holla@arm.com>
To: Marc Zyngier <maz@kernel.org>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
Hanjun Guo <guohanjun@huawei.com>,
dann frazier <dann.frazier@canonical.com>,
Fu Wei <wefu@redhat.com>, Len Brown <lenb@kernel.org>,
"Rafael J. Wysocki" <rjw@rjwysocki.net>,
linux-acpi@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, kernel-team@android.com,
Sudeep Holla <sudeep.holla@arm.com>
Subject: Re: [PATCH 2/2] ACPI: irq: Prevent unregistering of GIC SGIs
Date: Wed, 21 Apr 2021 18:15:16 +0100 [thread overview]
Message-ID: <20210421171516.hg3ex7jqigqjqa6i@bogus> (raw)
In-Reply-To: <20210421164317.1718831-3-maz@kernel.org>
On Wed, Apr 21, 2021 at 05:43:17PM +0100, Marc Zyngier wrote:
> When using ACPI on arm64, which implies the GIC IRQ model, no
> table should ever provide a GSI number in the range [0:15],
> as these are reserved for IPIs.
>
> However, drivers tend to call acpi_unregister_gsi() with any
> random GSI number provided by half baked tables, which results
> in an exploding kernel when its IPIs have been unconfigured.
>
> In order to catch this, check for the silly case early, warn
> that something is going wrong and avoid the above disaster.
>
Reviewed-by: Sudeep Holla <sudeep.holla@arm.com>
Just curious if this is just precaution or do we have a platform doing
something stupid like this ?
--
Regards,
Sudeep
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linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2021-04-21 17:15 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-21 16:43 [PATCH 0/2] arm64: ACPI GTDT watchdog fixes Marc Zyngier
2021-04-21 16:43 ` Marc Zyngier
2021-04-21 16:43 ` [PATCH 1/2] ACPI: GTDT: Don't corrupt interrupt mappings on watchdow probe failure Marc Zyngier
2021-04-21 16:43 ` Marc Zyngier
2021-04-21 17:14 ` Sudeep Holla
2021-04-21 17:14 ` Sudeep Holla
2021-04-21 17:20 ` Sudeep Holla
2021-04-21 17:20 ` Sudeep Holla
2021-04-21 17:57 ` Marc Zyngier
2021-04-21 17:57 ` Marc Zyngier
2021-04-21 16:43 ` [PATCH 2/2] ACPI: irq: Prevent unregistering of GIC SGIs Marc Zyngier
2021-04-21 16:43 ` Marc Zyngier
2021-04-21 17:15 ` Sudeep Holla [this message]
2021-04-21 17:15 ` Sudeep Holla
2021-04-21 17:56 ` Marc Zyngier
2021-04-21 17:56 ` Marc Zyngier
2021-04-21 18:09 ` [PATCH 0/2] arm64: ACPI GTDT watchdog fixes dann frazier
2021-04-21 18:09 ` dann frazier
2021-04-22 13:42 ` Hanjun Guo
2021-04-22 13:42 ` Hanjun Guo
2021-04-22 14:23 ` Lorenzo Pieralisi
2021-04-22 14:23 ` Lorenzo Pieralisi
2021-04-23 13:43 ` Catalin Marinas
2021-04-23 13:43 ` Catalin Marinas
2021-04-23 17:11 ` Catalin Marinas
2021-04-23 17:11 ` Catalin Marinas
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