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PCIe controller in Tegra194 requires the "dbi" region base address to be programmed in one of the application logic registers to enable CPU access to the "dbi" region. But, commita0fd361db8("PCI: dwc: Move "dbi", "dbi2", and "addr_space" resource setup into common code") moved the code that reads the whereabouts of "dbi" region to the common code causing the existing code in pcie-tegra194.c file to program NULL in the application logic registers. This is causing null pointer dereference when the "dbi" registers are accessed. This issue is fixed by explicitly reading the "dbi" base address from DT node. Link: https://lore.kernel.org/r/20201125192554.5401-1-vidyas@nvidia.com Fixes:a0fd361db8("PCI: dwc: Move "dbi", "dbi2", and "addr_space" resource setup into common code") Tested-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Vidya Sagar <vidyas@nvidia.com> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Acked-by: Thierry Reding <treding@nvidia.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.