TTY: pty, fix pty counting

[firefly-linux-kernel-4.4.55.git] / block / blk-core.c

diff --git a/block/blk-core.c b/block/blk-core.c
index d2f8f4049abddbf76d3414cd85ef36d2d4027d07..1d49e1c7c905cd1dadd8daf286205cee24e055b9 100644 (file)
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -839,6 +839,9 @@ struct request *blk_get_request(struct request_queue *q, int rw, gfp_t gfp_mask)
 {
        struct request *rq;
 
+       if (unlikely(test_bit(QUEUE_FLAG_DEAD, &q->queue_flags)))
+               return NULL;
+
        BUG_ON(rw != READ && rw != WRITE);
 
        spin_lock_irq(q->queue_lock);