From: Ming Lei <ming.lei@redhat.com>
Date: Fri, 3 Dec 2021 10:39:35 +0800
Subject: [PATCH] null_blk: allow zero poll queues
Git-commit: 2bfdbe8b7ebd17b5331071071a910fbabc64b436
Patch-mainline: v5.17-rc1
References: jsc#PED-1183
There isn't any reason to not allow zero poll queues from user
viewpoint.
Also sometimes we need to compare io poll between poll mode and irq
mode, so not allowing poll queues is bad.
Fixes: 15dfc662ef31 ("null_blk: Fix handling of submit_queues and poll_queues attributes")
Cc: Shin'ichiro Kawasaki <shinichiro.kawasaki@wdc.com>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Link: https://lore.kernel.org/r/20211203023935.3424042-1-ming.lei@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Acked-by: Hannes Reinecke <hare@suse.com>
---
drivers/block/null_blk/main.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)
diff --git a/drivers/block/null_blk/main.c b/drivers/block/null_blk/main.c
index 54f7d490f8eb..b4ff5ae1f70c 100644
--- a/drivers/block/null_blk/main.c
+++ b/drivers/block/null_blk/main.c
@@ -340,9 +340,9 @@ static int nullb_update_nr_hw_queues(struct nullb_device *dev,
return 0;
/*
- * Make sure at least one queue exists for each of submit and poll.
+ * Make sure at least one submit queue exists.
*/
- if (!submit_queues || !poll_queues)
+ if (!submit_queues)
return -EINVAL;
/*
@@ -1917,8 +1917,6 @@ static int null_validate_conf(struct nullb_device *dev)
if (dev->poll_queues > g_poll_queues)
dev->poll_queues = g_poll_queues;
- else if (dev->poll_queues == 0)
- dev->poll_queues = 1;
dev->prev_poll_queues = dev->poll_queues;
dev->queue_mode = min_t(unsigned int, dev->queue_mode, NULL_Q_MQ);
--
2.35.3