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raid5: fix broken async operation chain 

ops_run_reconstruct6() doesn't correctly chain asyn operations. The tx returned
by async_gen_syndrome should be added as the dependent tx of next stripe.

The issue is introduced by commit 59fc630b8b
    RAID5: batch adjacent full stripe write

Reported-and-tested-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Shaohua Li <shli@fb.com>
Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
Shaohua Li 2015-05-13 09:30:08 -07:00 committed by NeilBrown
parent bb27051f9f
commit 487696957e
1 changed files with 1 additions and 1 deletions
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2
drivers/md/raid5.c
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@ -1822,7 +1822,7 @@ ops_run_reconstruct6(struct stripe_head *sh, struct raid5_percpu *percpu,
} else
init_async_submit(&submit, 0, tx, NULL, NULL,
to_addr_conv(sh, percpu, j));
async_gen_syndrome(blocks, 0, count+2, STRIPE_SIZE, &submit);
tx = async_gen_syndrome(blocks, 0, count+2, STRIPE_SIZE, &submit);
if (!last_stripe) {
j++;
sh = list_first_entry(&sh->batch_list, struct stripe_head,