drbd: don't cond_resched_lock with IRQs disabled

The last commit, drbd: add missing spinlock to bitmap receive,
introduced a cond_resched_lock(), where the lock in question is taken
with irqs disabled.

As we must not schedule with IRQs disabled,
and cond_resched_lock_irq() does not exist, yet,
we re-aquire the spin_lock_irq() for each bitmap page processed in turn.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>

diff --git a/drivers/block/drbd/drbd_bitmap.c b/drivers/block/drbd/drbd_bitmap.c
index 1e89a74..61f4fae 100644 (file)
--- a/drivers/block/drbd/drbd_bitmap.c
+++ b/drivers/block/drbd/drbd_bitmap.c
@@ -1400,8 +1400,10 @@ void _drbd_bm_set_bits(struct drbd_conf *mdev, const unsigned long s, const unsi
        /* first and full pages, unless first page == last page */
        for (page_nr = first_page; page_nr < last_page; page_nr++) {
                bm_set_full_words_within_one_page(mdev->bitmap, page_nr, first_word, last_word);
-               cond_resched_lock(&b->bm_lock);
+               spin_unlock_irq(&b->bm_lock);
+               cond_resched();
                first_word = 0;
+               spin_lock_irq(&b->bm_lock);
        }
 
        /* last page (respectively only page, for first page == last page) */