4f8116c850
In order to remove dependency on rtnl lock, extend tcf_block with 'cb_lock' rwsem and use it to protect flow_block->cb_list and related counters from concurrent modification. The lock is taken in read mode for read-only traversal of cb_list in tc_setup_cb_call() and write mode in all other cases. This approach ensures that: - cb_list is not changed concurrently while filters is being offloaded on block. - block->nooffloaddevcnt is checked while holding the lock in read mode, but is only changed by bind/unbind code when holding the cb_lock in write mode to prevent concurrent modification. Signed-off-by: Vlad Buslov <vladbu@mellanox.com> Acked-by: Jiri Pirko <jiri@mellanox.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.