Support I/O polling if submit_bio_noacct_mq_direct returned non-empty
cookie.
Signed-off-by: Mikulas Patocka <mpatocka@xxxxxxxxxx>
---
drivers/md/dm.c | 5 +++++
1 file changed, 5 insertions(+)
Index: linux-2.6/drivers/md/dm.c
===================================================================
--- linux-2.6.orig/drivers/md/dm.c 2021-03-02 19:26:34.000000000 +0100
+++ linux-2.6/drivers/md/dm.c 2021-03-02 19:26:34.000000000 +0100
@@ -1682,6 +1682,11 @@ static void __split_and_process_bio(stru
}
}
+ if (ci.poll_cookie != BLK_QC_T_NONE) {
+ while (atomic_read(&ci.io->io_count) > 1 &&
+ blk_poll(ci.poll_queue, ci.poll_cookie, true)) ;
+ }
+
/* drop the extra reference count */
dec_pending(ci.io, errno_to_blk_status(error));
}
