md: move freeing of badblocks.page into md_rdev_clear

This ensures that it is always freed - there were case where
we failed to free the page.

Reported-by: majianpeng <majianpeng@gmail.com>
Signed-off-by: NeilBrown <neilb@suse.de>

diff --git a/drivers/md/md.c b/drivers/md/md.c
index d557e55..ac99616 100644 (file)
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -816,6 +816,8 @@ void md_rdev_clear(struct md_rdev *rdev)
                put_page(rdev->bb_page);
                rdev->bb_page = NULL;
        }
+       kfree(rdev->badblocks.page);
+       rdev->badblocks.page = NULL;
 }
 EXPORT_SYMBOL_GPL(md_rdev_clear);
 
@@ -2191,9 +2193,7 @@ static void unbind_rdev_from_array(struct md_rdev * rdev)
        sysfs_remove_link(&rdev->kobj, "block");
        sysfs_put(rdev->sysfs_state);
        rdev->sysfs_state = NULL;
-       kfree(rdev->badblocks.page);
        rdev->badblocks.count = 0;
-       rdev->badblocks.page = NULL;
        /* We need to delay this, otherwise we can deadlock when
         * writing to 'remove' to "dev/state".  We also need
         * to delay it due to rcu usage.
@@ -3325,7 +3325,6 @@ abort_free:
        if (rdev->bdev)
                unlock_rdev(rdev);
        md_rdev_clear(rdev);
-       kfree(rdev->badblocks.page);
        kfree(rdev);
        return ERR_PTR(err);
 }