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A netdevice may be marked as detached because the parent is runtime-suspended and not accessible whilst interface or link is down. An example are PCI network devices that go into PCI D3hot, see e.g. __igc_shutdown() or rtl8169_net_suspend(). If netdevice is down and marked as detached we can only open it if we runtime-resume it before __dev_open() calls netif_device_present(). Therefore, if netdevice is detached, try to runtime-resume the parent and only return with an error if it's still detached. Signed-off-by: Heiner Kallweit <hkallweit1@gmail.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.