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For md_check_recovery(): 1) if 'MD_RECOVERY_RUNING' is not set, register new sync_thread. 2) if 'MD_RECOVERY_RUNING' is set: a) if 'MD_RECOVERY_DONE' is not set, don't do anything, wait for md_do_sync() to be done. b) if 'MD_RECOVERY_DONE' is set, unregister sync_thread. Current code expects that sync_thread is not NULL, otherwise new sync_thread will be registered, which will corrupt the array. Make sure md_check_recovery() won't register new sync_thread if 'MD_RECOVERY_RUNING' is still set, and a new WARN_ON_ONCE() is added for the above corruption, Signed-off-by: Yu Kuai <yukuai3@huawei.com> Reviewed-by: Xiao Ni <xni@redhat.com> Signed-off-by: Song Liu <song@kernel.org> Link: https://lore.kernel.org/r/20230529132037.2124527-7-yukuai1@huaweicloud.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.