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-rw-r--r--block/blk-core.c15
1 files changed, 9 insertions, 6 deletions
diff --git a/block/blk-core.c b/block/blk-core.c
index f46a43ef1a94..a4a2dbe46fe3 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -65,23 +65,26 @@ static struct workqueue_struct *kblockd_workqueue;
static void blk_clear_congested(struct request_list *rl, int sync)
{
- if (rl != &rl->q->root_rl)
- return;
#ifdef CONFIG_CGROUP_WRITEBACK
clear_wb_congested(rl->blkg->wb_congested, sync);
#else
- clear_wb_congested(rl->q->backing_dev_info.wb.congested, sync);
+ /*
+ * If !CGROUP_WRITEBACK, all blkg's map to bdi->wb and we shouldn't
+ * flip its congestion state for events on other blkcgs.
+ */
+ if (rl == &rl->q->root_rl)
+ clear_wb_congested(rl->q->backing_dev_info.wb.congested, sync);
#endif
}
static void blk_set_congested(struct request_list *rl, int sync)
{
- if (rl != &rl->q->root_rl)
- return;
#ifdef CONFIG_CGROUP_WRITEBACK
set_wb_congested(rl->blkg->wb_congested, sync);
#else
- set_wb_congested(rl->q->backing_dev_info.wb.congested, sync);
+ /* see blk_clear_congested() */
+ if (rl == &rl->q->root_rl)
+ set_wb_congested(rl->q->backing_dev_info.wb.congested, sync);
#endif
}