md/md-multipath: remove rcu protection to access rdev from conf

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Because it's safe to accees rdev from conf:
 - If any spinlock is held, because synchronize_rcu() from
   md_kick_rdev_from_array() will prevent 'rdev' to be freed until
   spinlock is released;
 - If there is normal IO inflight, because mddev_suspend() will prevent
   rdev to be added or removed from array;

And these will cover all the scenarios in md-multipath.

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Signed-off-by: Song Liu <song@kernel.org>
Link: https://lore.kernel.org/r/20231125081604.3939938-6-yukuai1@huaweicloud.com

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Yu Kuai 2023-11-25 16:16:04 +08:00 • committed by Song Liu

parent ad8606702f

commit 7ecab28c3b

1 changed files with 12 additions and 11 deletions

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drivers/md/md-multipath.c

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