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This code handles NETEVENT_DELAY_PROBE_TIME_UPDATE, which is invoked every time the delay_probe_time changes. mlxsw router currently only maintains one timer, so the last delay_probe_time set wins. Currently, mlxsw uses mlxsw_sp_port_lower_dev_hold() to find a reference to the router. This is no longer necessary. But as a side effect, this makes sure that only updates to "interesting netdevices" (ones that have a physical netdevice lower) are projected. Retain that side effect by calling mlxsw_sp_port_dev_lower_find_rcu() and punting if there is none. Then just proceed using the router pointer that's already at hand in the helper. Note that previously, the code took and put a reference of the netdevice. Because the mlxsw_sp pointer is now obtained from the notifier block, the port pointer (non-) NULL-ness is all that's relevant, and the reference does not need to be taken anymore. Signed-off-by: Petr Machata <petrm@nvidia.com> Reviewed-by: Amit Cohen <amcohen@nvidia.com> Reviewed-by: Simon Horman <simon.horman@corigine.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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.