blk-mq: make mq_ops a const pointer

We never change it, make that clear.

Signed-off-by: Jens Axboe <axboe@fb.com>
Reviewed-by: Bart Van Assche <bart.vanassche@sandisk.com>

diff --git a/block/blk-mq.c b/block/blk-mq.c
index a8e67a1..79e1cb0 100644 (file)
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -639,7 +639,7 @@ struct blk_mq_timeout_data {
 
 void blk_mq_rq_timed_out(struct request *req, bool reserved)
 {
-       struct blk_mq_ops *ops = req->q->mq_ops;
+       const struct blk_mq_ops *ops = req->q->mq_ops;
        enum blk_eh_timer_return ret = BLK_EH_RESET_TIMER;
 
        /*

diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h
index 4a2ab5d..afc81d7 100644 (file)
--- a/include/linux/blk-mq.h
+++ b/include/linux/blk-mq.h
@@ -60,7 +60,7 @@ struct blk_mq_hw_ctx {
 
 struct blk_mq_tag_set {
        unsigned int            *mq_map;
-       struct blk_mq_ops       *ops;
+       const struct blk_mq_ops *ops;
        unsigned int            nr_hw_queues;
        unsigned int            queue_depth;    /* max hw supported */
        unsigned int            reserved_tags;

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index b20da8d..2e99d65 100644 (file)
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -407,7 +407,7 @@ struct request_queue {
        dma_drain_needed_fn     *dma_drain_needed;
        lld_busy_fn             *lld_busy_fn;
 
-       struct blk_mq_ops       *mq_ops;
+       const struct blk_mq_ops *mq_ops;
 
        unsigned int            *mq_map;