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-rw-r--r--block/blk-flush.c18
1 files changed, 13 insertions, 5 deletions
diff --git a/block/blk-flush.c b/block/blk-flush.c
index a867e3f524f3..0bd8c9c5d6e5 100644
--- a/block/blk-flush.c
+++ b/block/blk-flush.c
@@ -212,9 +212,14 @@ static void flush_end_io(struct request *flush_rq, int error)
queued |= blk_flush_complete_seq(rq, seq, error);
}
- /* after populating an empty queue, kick it to avoid stall */
+ /*
+ * Moving a request silently to empty queue_head may stall the
+ * queue. Kick the queue in those cases. This function is called
+ * from request completion path and calling directly into
+ * request_fn may confuse the driver. Always use kblockd.
+ */
if (queued && was_empty)
- __blk_run_queue(q);
+ __blk_run_queue(q, true);
}
/**
@@ -257,7 +262,7 @@ static bool blk_kick_flush(struct request_queue *q)
q->flush_rq.end_io = flush_end_io;
q->flush_pending_idx ^= 1;
- elv_insert(q, &q->flush_rq, ELEVATOR_INSERT_FRONT);
+ elv_insert(q, &q->flush_rq, ELEVATOR_INSERT_REQUEUE);
return true;
}
@@ -266,9 +271,12 @@ static void flush_data_end_io(struct request *rq, int error)
struct request_queue *q = rq->q;
bool was_empty = elv_queue_empty(q);
- /* after populating an empty queue, kick it to avoid stall */
+ /*
+ * After populating an empty queue, kick it to avoid stall. Read
+ * the comment in flush_end_io().
+ */
if (blk_flush_complete_seq(rq, REQ_FSEQ_DATA, error) && was_empty)
- __blk_run_queue(q);
+ __blk_run_queue(q, true);
}
/**