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deeeaf6a52
On platforms with a static replicator, a kernel panic occurs during boot:
[ 4.999406] replicator_probe+0x1f8/0x360
[ 5.003455] replicator_platform_probe+0x64/0xd8
[ 5.008115] platform_probe+0x70/0xf0
[ 5.011812] really_probe+0xc4/0x2a8
[ 5.015417] __driver_probe_device+0x80/0x140
[ 5.019813] driver_probe_device+0xe4/0x170
[ 5.024032] __driver_attach+0x9c/0x1b0
[ 5.027900] bus_for_each_dev+0x7c/0xe8
[ 5.031769] driver_attach+0x2c/0x40
[ 5.035373] bus_add_driver+0xec/0x218
[ 5.039154] driver_register+0x68/0x138
[ 5.043023] __platform_driver_register+0x2c/0x40
[ 5.047771] coresight_init_driver+0x4c/0xe0
[ 5.052079] replicator_init+0x30/0x48
[ 5.055865] do_one_initcall+0x4c/0x280
[ 5.059736] kernel_init_freeable+0x1ec/0x3c8
[ 5.064134] kernel_init+0x28/0x1f0
[ 5.067655] ret_from_fork+0x10/0x20
A static replicator doesn't have registers, so accessing the claim
register results in a NULL pointer deference. Fixes the issue by
accessing the claim registers only after the I/O resource has been
successfully mapped.
Fixes:
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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 reStructuredText 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.