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Guillaume Nault says: ==================== l2tp: register sessions atomically Currently l2tp_session_create() allocates a session, partially initialises it and finally registers it. It therefore exposes sessions that aren't fully initialised to the rest of the system, because pseudo-wire specific initialisation can only happen after l2tp_session_create() returns. This leads to several crashes when these sessions are used or deleted. This series starts by splitting session registration out of l2tp_session_create() (patch #1). Thus allowing pseudo-wires code to terminate the initialisation phase before registration. Then patch #2 fixes the eth pseudo-wire code. This requires protecting the session's netdevice pointer with RCU, because it still needs to be updated concurrently after the session got registered. Remaining patches take care of ppp pseudo-wires. RCU protection is needed there too, for the same reasons. This time it's the pppol2tp socket pointer that gets protected. For clarity, and since the conversion requires more modifications, introducing RCU is done in its own patch (#3). Then patch #4 only has to take care of fixing sessions initialisation and registration (and adapting part of the deletion process). ==================== Signed-off-by: David S. Miller <davem@davemloft.net>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.