* [PATCH V2] null_blk: cleanup null_init_tag_set
@ 2022-07-15 14:28 Ming Lei
2022-07-15 14:42 ` Jens Axboe
0 siblings, 1 reply; 2+ messages in thread
From: Ming Lei @ 2022-07-15 14:28 UTC (permalink / raw)
To: Jens Axboe; +Cc: linux-block, Ming Lei, Vincent Fu
The passed 'nullb' can be NULL, so cause null ptr reference.
Fix the issue, meantime cleanup null_init_tag_set for avoiding to add
similar issue in future.
Meantime set BLK_MQ_F_NO_SCHED if g_no_sched is true in case of NULL
device, same with BLK_MQ_F_TAG_HCTX_SHARED.
Cc: Vincent Fu <vincent.fu@samsung.com>
Fixes: 37ae152c7a0d ("null_blk: add configfs variables for 2 options")
Signed-off-by: Ming Lei <ming.lei@redhat.com>
---
V2:
- set BLK_MQ_F_NO_SCHED & BLK_MQ_F_TAG_HCTX_SHARED correctly in case
of null device, as suggested by Vincent Fu
drivers/block/null_blk/main.c | 53 +++++++++++++++++++++++------------
1 file changed, 35 insertions(+), 18 deletions(-)
diff --git a/drivers/block/null_blk/main.c b/drivers/block/null_blk/main.c
index c955a07dba2d..1501c85fc9e4 100644
--- a/drivers/block/null_blk/main.c
+++ b/drivers/block/null_blk/main.c
@@ -1898,31 +1898,48 @@ static int null_gendisk_register(struct nullb *nullb)
static int null_init_tag_set(struct nullb *nullb, struct blk_mq_tag_set *set)
{
+ unsigned int flags = BLK_MQ_F_SHOULD_MERGE;
+ int hw_queues, numa_node;
+ unsigned int queue_depth;
int poll_queues;
+ if (nullb) {
+ hw_queues = nullb->dev->submit_queues;
+ poll_queues = nullb->dev->poll_queues;
+ queue_depth = nullb->dev->hw_queue_depth;
+ numa_node = nullb->dev->home_node;
+ if (nullb->dev->no_sched)
+ flags |= BLK_MQ_F_NO_SCHED;
+ if (nullb->dev->shared_tag_bitmap)
+ flags |= BLK_MQ_F_TAG_HCTX_SHARED;
+ if (nullb->dev->blocking)
+ flags |= BLK_MQ_F_BLOCKING;
+ } else {
+ hw_queues = g_submit_queues;
+ poll_queues = g_poll_queues;
+ queue_depth = g_hw_queue_depth;
+ numa_node = g_home_node;
+ if (g_no_sched)
+ flags |= BLK_MQ_F_NO_SCHED;
+ if (g_shared_tag_bitmap)
+ flags |= BLK_MQ_F_TAG_HCTX_SHARED;
+ if (g_blocking)
+ flags |= BLK_MQ_F_BLOCKING;
+ }
+
set->ops = &null_mq_ops;
- set->nr_hw_queues = nullb ? nullb->dev->submit_queues :
- g_submit_queues;
- poll_queues = nullb ? nullb->dev->poll_queues : g_poll_queues;
- if (poll_queues)
- set->nr_hw_queues += poll_queues;
- set->queue_depth = nullb ? nullb->dev->hw_queue_depth :
- g_hw_queue_depth;
- set->numa_node = nullb ? nullb->dev->home_node : g_home_node;
set->cmd_size = sizeof(struct nullb_cmd);
- set->flags = BLK_MQ_F_SHOULD_MERGE;
- if (nullb->dev->no_sched)
- set->flags |= BLK_MQ_F_NO_SCHED;
- if (nullb->dev->shared_tag_bitmap)
- set->flags |= BLK_MQ_F_TAG_HCTX_SHARED;
+ set->flags = flags;
set->driver_data = nullb;
- if (poll_queues)
+ set->nr_hw_queues = hw_queues;
+ set->queue_depth = queue_depth;
+ set->numa_node = numa_node;
+ if (poll_queues) {
+ set->nr_hw_queues += poll_queues;
set->nr_maps = 3;
- else
+ } else {
set->nr_maps = 1;
-
- if ((nullb && nullb->dev->blocking) || g_blocking)
- set->flags |= BLK_MQ_F_BLOCKING;
+ }
return blk_mq_alloc_tag_set(set);
}
--
2.31.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH V2] null_blk: cleanup null_init_tag_set
2022-07-15 14:28 [PATCH V2] null_blk: cleanup null_init_tag_set Ming Lei
@ 2022-07-15 14:42 ` Jens Axboe
0 siblings, 0 replies; 2+ messages in thread
From: Jens Axboe @ 2022-07-15 14:42 UTC (permalink / raw)
To: ming.lei; +Cc: vincent.fu, linux-block
On Fri, 15 Jul 2022 22:28:47 +0800, Ming Lei wrote:
> The passed 'nullb' can be NULL, so cause null ptr reference.
>
> Fix the issue, meantime cleanup null_init_tag_set for avoiding to add
> similar issue in future.
>
> Meantime set BLK_MQ_F_NO_SCHED if g_no_sched is true in case of NULL
> device, same with BLK_MQ_F_TAG_HCTX_SHARED.
>
> [...]
Applied, thanks!
[1/1] null_blk: cleanup null_init_tag_set
commit: dec7e933d65dbc6eaa6c7fd8f960df164a20dd4d
Best regards,
--
Jens Axboe
^ permalink raw reply [flat|nested] 2+ messages in thread
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