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Commit90f5f7ad4f("md: Wait for md_check_recovery before attempting device removal.") explained in the commit message that failed device must be reomoved from the personality first by md_check_recovery(), before it can be removed from the array. That's the reason the commit add the code to wait for MD_RECOVERY_NEEDED. However, this is not the case now, because remove_and_add_spares() is called directly from hot_remove_disk() from ioctl path, hence failed device(marked faulty) can be removed from the personality by ioctl. On the other hand, the commit introduced a performance problem that if MD_RECOVERY_NEEDED is set and the array is not running, ioctl will wait for 5s before it can return failure to user. Since the waiting is not needed now, fix the problem by removing the waiting. Fixes:90f5f7ad4f("md: Wait for md_check_recovery before attempting device removal.") Reported-by: Mateusz Kusiak <mateusz.kusiak@linux.intel.com> Closes: https://lore.kernel.org/all/814ff6ee-47a2-4ba0-963e-cf256ee4ecfa@linux.intel.com/ Signed-off-by: Yu Kuai <yukuai3@huawei.com> Signed-off-by: Song Liu <song@kernel.org> Link: https://lore.kernel.org/r/20240627112321.3044744-1-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 reStructuredText 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.