md/raid10: add rcu protection to rdev access during reshape.

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mirrors[].rdev can become NULL at any point unless:
   - a counted reference is held
   - ->reconfig_mutex is held, or
   - rcu_read_lock() is held

Reshape isn't always suitably careful as in the past rdev couldn't be
removed during reshape.  It can now, so add protection.

Signed-off-by: NeilBrown <neilb@suse.com>
Signed-off-by: Shaohua Li <shli@fb.com>

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NeilBrown 2016-06-02 16:19:52 +10:00 • committed by Shaohua Li

parent f90145f317

commit d094d6860b

1 changed files with 22 additions and 8 deletions

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drivers/md/raid10.c

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