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lustre_fill_super() calls client_fill_super() without holding a reference to the module containing client_fill_super. If that module is unloaded at a bad time, this can crash. To be able to get a reference to the module using try_get_module(), we need a pointer to the module. So replace lustre_register_client_fill_super() and lustre_register_kill_super_cb() with a single lustre_register_super_ops() which also passed a module pointer. Then use a spinlock to ensure the module pointer isn't removed while try_module_get() is running, and use try_module_get() to ensure we have a reference before calling client_fill_super(). Signed-off-by: NeilBrown <neilb@suse.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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.