linux-kernel - Re: [PATCH 4/8] ntb_perf: Wait for link before running test

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Date:	Mon, 13 Jun 2016 20:14:01 +0000
From:	"Jiang, Dave" <dave.jiang@...el.com>
To:	"Allen.Hubbe@....com" <Allen.Hubbe@....com>,
	"logang@...tatee.com" <logang@...tatee.com>,
	"jdmason@...zu.us" <jdmason@...zu.us>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"shuahkh@....samsung.com" <shuahkh@....samsung.com>,
	"sudipm.mukherjee@...il.com" <sudipm.mukherjee@...il.com>,
	"linux-kselftest@...r.kernel.org" <linux-kselftest@...r.kernel.org>,
	"arnd@...db.de" <arnd@...db.de>,
	"linux-ntb@...glegroups.com" <linux-ntb@...glegroups.com>
Subject: Re: [PATCH 4/8] ntb_perf: Wait for link before running test

On Fri, 2016-06-10 at 16:54 -0600, Logan Gunthorpe wrote:
> Instead of returning immediately with an error when the link is
> down, wait for the link to come up (or the user sends a SIGINT).
> 
> This is to make scripting ntb_perf easier.
> 
> Signed-off-by: Logan Gunthorpe <logang@...tatee.com>
Acked-by: Dave Jiang <dave.jiang@...el.com>

> ---
>  drivers/ntb/test/ntb_perf.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/ntb/test/ntb_perf.c
> b/drivers/ntb/test/ntb_perf.c
> index 05a8705..f0784e5 100644
> --- a/drivers/ntb/test/ntb_perf.c
> +++ b/drivers/ntb/test/ntb_perf.c
> @@ -135,6 +135,7 @@ struct perf_ctx {
>  	bool			link_is_up;
>  	struct work_struct	link_cleanup;
>  	struct delayed_work	link_work;
> +	wait_queue_head_t	link_wq;
>  	struct dentry		*debugfs_node_dir;
>  	struct dentry		*debugfs_run;
>  	struct dentry		*debugfs_threads;
> @@ -533,6 +534,7 @@ static void perf_link_work(struct work_struct
> *work)
>  		goto out1;
>  
>  	perf->link_is_up = true;
> +	wake_up(&perf->link_wq);
>  
>  	return;
>  
> @@ -653,7 +655,7 @@ static ssize_t debugfs_run_write(struct file
> *filp, const char __user *ubuf,
>  	int node, i;
>  	DECLARE_WAIT_QUEUE_HEAD(wq);
>  
> -	if (!perf->link_is_up)
> +	if (wait_event_interruptible(perf->link_wq, perf-
> >link_is_up))
>  		return -ENOLINK;
>  
>  	if (perf->perf_threads == 0)
> @@ -783,6 +785,7 @@ static int perf_probe(struct ntb_client *client,
> struct ntb_dev *ntb)
>  	mutex_init(&perf->run_mutex);
>  	spin_lock_init(&perf->db_lock);
>  	perf_setup_mw(ntb, perf);
> +	init_waitqueue_head(&perf->link_wq);
>  	INIT_DELAYED_WORK(&perf->link_work, perf_link_work);
>  	INIT_WORK(&perf->link_cleanup, perf_link_cleanup);
>  
> -- 
> 2.1.4
>