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08 September 2024, 02:26:05 UTC
Revision 4589f450fb285ab85f7513b6649e51ec2a820653 authored by Matt Redfearn on 21 April 2016, 09:08:32 UTC, committed by Thomas Gleixner on 21 April 2016, 10:05:15 UTC 
genirq: Dont allow affinity mask to be updated on IPIs
 
The IPI domain re-purposes the IRQ affinity to signify the mask of CPUs
that this IPI will deliver to. This must not be modified before the IPI
is destroyed again, so set the IRQ_NO_BALANCING flag to prevent the
affinity being overwritten by setup_affinity().

Without this, if an IPI is reserved for a single target CPU, then
allocated using __setup_irq(), the affinity is overwritten with
cpu_online_mask. When ipi_destroy() is subsequently called on a
multi-cpu system, it will attempt to free cpumask_weight() IRQs
that were never allocated, and crash.

Fixes: d17bf24e6952 ("genirq: Add a new generic IPI reservation code to irq core")
Signed-off-by: Matt Redfearn <matt.redfearn@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: jason@lakedaemon.net
Cc: marc.zyngier@arm.com
Cc: ralf@linux-mips.org
Cc: Qais Yousef <qsyousef@gmail.com>
Cc: lisa.parratt@imgtec.com
Link: http://lkml.kernel.org/r/1461229712-13057-1-git-send-email-matt.redfearn@imgtec.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
1 parent c3b46c7
History
Tip revision: 4589f450fb285ab85f7513b6649e51ec2a820653 authored by Matt Redfearn on 21 April 2016, 09:08:32 UTC
genirq: Dont allow affinity mask to be updated on IPIs
Tip revision: 4589f45
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