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5bb3c1e9d4
There is a dead lock in usnic ib_register and netdev_notify path. usnic_ib_discover_pf() | mutex_lock(&usnic_ib_ibdev_list_lock); | usnic_ib_device_add(); | ib_register_device() | usnic_ib_query_port() | mutex_lock(&us_ibdev->usdev_lock); | ib_get_eth_speed() | rtnl_lock() order of lock: &usnic_ib_ibdev_list_lock -> usdev_lock -> rtnl_lock rtnl_lock() | usnic_ib_netdevice_event() | mutex_lock(&usnic_ib_ibdev_list_lock); order of lock: rtnl_lock -> &usnic_ib_ibdev_list_lock Solution is to use the core's lock-free ib_device_get_by_netdev() scheme to lookup ib_dev while handling netdev & inet events. Signed-off-by: Parvi Kaustubhi <pkaustub@cisco.com> Reviewed-by: Govindarajulu Varadarajan <gvaradar@cisco.com> Reviewed-by: Tanmay Inamdar <tinamdar@cisco.com> Signed-off-by: Jason Gunthorpe <jgg@mellanox.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.