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When of_link_to_phandle() was implemented initially, there was no way to tell if device_link_add() was failing because the supplier device hasn't been parsed yet, hasn't been added yet, the links were creating a cycle, etc. Some of these were transient errors that'd go away at a later point. However, with the current set of improved checks, if device_link_add() fails, it'll only be for permanent errors like cycles or out-of-memory errors. Also, with the addition of DL_FLAG_SYNC_STATE_ONLY flag [1] to device links, all the valid dependency cycles due to "proxy" device links (needed for correctness of sync_state() device callback) will never fail device_link_add() due to cycles. So, continuing to retry failing device links (by returning -EAGAIN) is no longer useful. At worst, it prevents platforms from setting fw_devlink=on (or better) because it prevents proper boot up. So, let's not do that anymore. [1] - https://lore.kernel.org/lkml/20191028220027.251605-1-saravanak@google.com/ Cc: Nicolas Saenz Julienne <nsaenzjulienne@suse.de> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Saravana Kannan <saravanak@google.com> Tested-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de> Signed-off-by: Rob Herring <robh@kernel.org>
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.