[PATCH] null_blk: boundary check queue_mode and irqmode

[PATCH] null_blk: boundary check queue_mode and irqmode

[Matias Bjørling]

When either queue_mode or irq_mode parameter is set outside its boundaries, the
driver will not complete requests. This stalls driver initialization when
partitions are probed. Fix by setting out of bound values to the parameters
default.

Signed-off-by: Matias Bjørling <m@bjorling.me>
---
 drivers/block/null_blk.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/drivers/block/null_blk.c b/drivers/block/null_blk.c
index caa6121..efe9f76 100644
--- a/drivers/block/null_blk.c
+++ b/drivers/block/null_blk.c
@@ -506,7 +506,7 @@ static int null_add_dev(void)
 		rv = init_driver_queues(nullb);
 		if (rv)
 			goto out_cleanup_blk_queue;
-	} else {
+	} else if (queue_mode == NULL_Q_RQ) {
 		nullb->q = blk_init_queue_node(null_request_fn, &nullb->lock, home_node);
 		if (!nullb->q) {
 			rv = -ENOMEM;
@@ -574,6 +574,18 @@ static int __init null_init(void)
 		bs = PAGE_SIZE;
 	}
 
+	if (queue_mode < 0 || queue_mode > NULL_Q_MQ) {
+		pr_warn("null_blk: invalid queue mode\n");
+		pr_warn("null_blk: defaults queue mode to multiqueue\n");
+		queue_mode = NULL_Q_MQ;
+	}
+
+	if (irqmode < 0 || irqmode > NULL_IRQ_TIMER) {
+		pr_warn("null_blk: invalid irq mode\n");
+		pr_warn("null_blk: defauls irq mode to softirq\n");
+		irqmode = NULL_IRQ_SOFTIRQ;
+	}
+
 	if (queue_mode == NULL_Q_MQ && use_per_node_hctx) {
 		if (submit_queues < nr_online_nodes) {
 			pr_warn("null_blk: submit_queues param is set to %u.",
-- 
1.9.1

Re: [PATCH] null_blk: boundary check queue_mode and irqmode

[Jens Axboe]

On 11/26/2014 08:02 AM, Matias Bjørling wrote:
> When either queue_mode or irq_mode parameter is set outside its boundaries, the
> driver will not complete requests. This stalls driver initialization when
> partitions are probed. Fix by setting out of bound values to the parameters
> default.
>
> Signed-off-by: Matias Bjørling <m@bjorling.me>
> ---
>   drivers/block/null_blk.c | 14 +++++++++++++-
>   1 file changed, 13 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/block/null_blk.c b/drivers/block/null_blk.c
> index caa6121..efe9f76 100644
> --- a/drivers/block/null_blk.c
> +++ b/drivers/block/null_blk.c
> @@ -506,7 +506,7 @@ static int null_add_dev(void)
>   		rv = init_driver_queues(nullb);
>   		if (rv)
>   			goto out_cleanup_blk_queue;
> -	} else {
> +	} else if (queue_mode == NULL_Q_RQ) {
>   		nullb->q = blk_init_queue_node(null_request_fn, &nullb->lock, home_node);
>   		if (!nullb->q) {
>   			rv = -ENOMEM;
> @@ -574,6 +574,18 @@ static int __init null_init(void)
>   		bs = PAGE_SIZE;
>   	}
>
> +	if (queue_mode < 0 || queue_mode > NULL_Q_MQ) {
> +		pr_warn("null_blk: invalid queue mode\n");
> +		pr_warn("null_blk: defaults queue mode to multiqueue\n");
> +		queue_mode = NULL_Q_MQ;
> +	}
> +
> +	if (irqmode < 0 || irqmode > NULL_IRQ_TIMER) {
> +		pr_warn("null_blk: invalid irq mode\n");
> +		pr_warn("null_blk: defauls irq mode to softirq\n");
> +		irqmode = NULL_IRQ_SOFTIRQ;
> +	}

Lets fix these by using module_param_cb() instead to reject invalid 
values upfront.

-- 
Jens Axboe

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