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When invoke __nf_conntrack_helper_find, it needs the rcu lock to protect the helper module which would not be unloaded. Now there are two caller nf_conntrack_helper_try_module_get and ctnetlink_create_expect which don't hold rcu lock. And the other callers left like ctnetlink_change_helper, ctnetlink_create_conntrack, and ctnetlink_glue_attach_expect, they already hold the rcu lock or spin_lock_bh. Remove the rcu lock in functions nf_ct_helper_expectfn_find_by_name and nf_ct_helper_expectfn_find_by_symbol. Because they return one pointer which needs rcu lock, so their caller should hold the rcu lock, not in these two functions. Signed-off-by: Gao Feng <fgao@ikuai8.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.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.