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It is incorrect to call netif_carrier_off(), or in fact any driver teardown, before unregister_netdev() has been called. unregister_netdev() unpublishes the network device from userspace, and takes the interface down if it was up prior to returning. Therefore, once the call has returned, we are guaranteed that .ndo_stop() will have been called for an interface that was up. Phylink will take the carrier down via phylink_stop(), making any manipulation of the carrier in the remove path unnecessary. In the stmmac_release() path, the netif_carrier_off() call follows the call to phylink_stop(), so this call is redundant. Reviewed-by: Andrew Halaney <ahalaney@redhat.com> Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk> Reviewed-by: Serge Semin <fancer.lancer@gmail.com> Link: https://lore.kernel.org/r/E1sCErZ-00EOPx-PF@rmk-PC.armlinux.org.uk Signed-off-by: Jakub Kicinski <kuba@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 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.