md: initialise ->writes_pending in personality modules.
authorNeilBrown <neilb@suse.com>
Mon, 5 Jun 2017 06:05:13 +0000 (16:05 +1000)
committerShaohua Li <shli@fb.com>
Mon, 5 Jun 2017 23:04:35 +0000 (16:04 -0700)
commita415c0f10627913793709ddb75add09d2ea334dc
treeb54d1e13bae320a52efe48d316c5e10ae0ee53dd
parent3c2993b8c6143d8a5793746a54eba8f86f95240f
md: initialise ->writes_pending in personality modules.

The new per-cpu counter for writes_pending is initialised in
md_alloc(), which is not called by dm-raid.
So dm-raid fails when md_write_start() is called.

Move the initialization to the personality modules
that need it.  This way it is always initialised when needed,
but isn't unnecessarily initialized (requiring memory allocation)
when the personality doesn't use writes_pending.

Reported-by: Heinz Mauelshagen <heinzm@redhat.com>
Fixes: 4ad23a976413 ("MD: use per-cpu counter for writes_pending")
Signed-off-by: NeilBrown <neilb@suse.com>
Signed-off-by: Shaohua Li <shli@fb.com>
drivers/md/md.c
drivers/md/md.h
drivers/md/raid1.c
drivers/md/raid10.c
drivers/md/raid5.c