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The GICv4.1 spec tells us that it's CONSTRAINED UNPREDICTABLE to issue a register-based invalidation operation for a vPEID not mapped to that RD, or another RD within the same CommonLPIAff group. To follow this rule, commitf3a059219b("irqchip/gic-v4.1: Ensure mutual exclusion between vPE affinity change and RD access") tried to address the race between the RD accesses and the vPE affinity change, but somehow forgot to take GICR_INVALLR into account. Let's take the vpe_lock before evaluating vpe->col_idx to fix it. Fixes:f3a059219b("irqchip/gic-v4.1: Ensure mutual exclusion between vPE affinity change and RD access") Signed-off-by: Zenghui Yu <yuzenghui@huawei.com> Signed-off-by: Marc Zyngier <maz@kernel.org> Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20200720092328.708-1-yuzenghui@huawei.com
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.