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After commitb39f35ebe8("md: don't quiesce in mddev_suspend()"), 'conf->barrier' will be leaked in the case that raid10 takeover raid0: level_store pers->takeover -> raid10_takeover raid10_takeover_raid0 WRITE_ONCE(conf->barrier, 1) mddev_suspend // still raid0 mddev->pers = pers // switch to raid10 mddev_resume // resume without suspend After the above commit, mddev_resume() will not decrease 'conf->barrier' that is set in raid10_takeover_raid0(). Fix this problem by not setting 'conf->barrier' in raid10_takeover_raid0(). By the way, this problem is found while I'm trying to make mddev_suspend/resume() to be independent from raid personalities. raid10 is the only personality to use reference count in the quiesce() callback and this problem is only related to raid10. Fixes:b39f35ebe8("md: don't quiesce in mddev_suspend()") Signed-off-by: Yu Kuai <yukuai3@huawei.com> Reviewed-by: Paul Menzel <pmenzel@molgen.mpg.de> Link: https://lore.kernel.org/r/20230731022800.1424902-1-yukuai1@huaweicloud.com Signed-off-by: Song Liu <song@kernel.org>
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.