Merge tag 'dmaengine-fix-5.5-rc5' of git://git.infradead.org/users/vkoul/slave-dma

[linux-2.6-microblaze.git] / block / blk-core.c

diff --git a/block/blk-core.c b/block/blk-core.c
index e4b27f7..089e890 100644 (file)
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -885,11 +885,14 @@ generic_make_request_checks(struct bio *bio)
        }
 
        /*
-        * For a REQ_NOWAIT based request, return -EOPNOTSUPP
-        * if queue is not a request based queue.
+        * Non-mq queues do not honor REQ_NOWAIT, so complete a bio
+        * with BLK_STS_AGAIN status in order to catch -EAGAIN and
+        * to give a chance to the caller to repeat request gracefully.
         */
-       if ((bio->bi_opf & REQ_NOWAIT) && !queue_is_mq(q))
-               goto not_supported;
+       if ((bio->bi_opf & REQ_NOWAIT) && !queue_is_mq(q)) {
+               status = BLK_STS_AGAIN;
+               goto end_io;
+       }
 
        if (should_fail_bio(bio))
                goto end_io;
@@ -1310,7 +1313,7 @@ EXPORT_SYMBOL_GPL(blk_rq_err_bytes);
 
 void blk_account_io_completion(struct request *req, unsigned int bytes)
 {
-       if (blk_do_io_stat(req)) {
+       if (req->part && blk_do_io_stat(req)) {
                const int sgrp = op_stat_group(req_op(req));
                struct hd_struct *part;
 
@@ -1328,7 +1331,8 @@ void blk_account_io_done(struct request *req, u64 now)
         * normal IO on queueing nor completion.  Accounting the
         * containing request is enough.
         */
-       if (blk_do_io_stat(req) && !(req->rq_flags & RQF_FLUSH_SEQ)) {
+       if (req->part && blk_do_io_stat(req) &&
+           !(req->rq_flags & RQF_FLUSH_SEQ)) {
                const int sgrp = op_stat_group(req_op(req));
                struct hd_struct *part;