linux-kernel - Re: [PATCH 02/12] xenbus: add freeze/thaw/restore callbacks support

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Date:   Sat, 30 May 2020 18:56:30 -0400
From:   Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:     Anchal Agarwal <anchalag@...zon.com>, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de, hpa@...or.com, x86@...nel.org,
        jgross@...e.com, linux-pm@...r.kernel.org, linux-mm@...ck.org,
        kamatam@...zon.com, sstabellini@...nel.org, konrad.wilk@...cle.com,
        roger.pau@...rix.com, axboe@...nel.dk, davem@...emloft.net,
        rjw@...ysocki.net, len.brown@...el.com, pavel@....cz,
        peterz@...radead.org, eduval@...zon.com, sblbir@...zon.com,
        xen-devel@...ts.xenproject.org, vkuznets@...hat.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        dwmw@...zon.co.uk, benh@...nel.crashing.org
Subject: Re: [PATCH 02/12] xenbus: add freeze/thaw/restore callbacks support

On 5/19/20 7:25 PM, Anchal Agarwal wrote:
>  
>  int xenbus_dev_resume(struct device *dev)
>  {
> -	int err;
> +	int err = 0;


That's not necessary.


>  	struct xenbus_driver *drv;
>  	struct xenbus_device *xdev
>  		= container_of(dev, struct xenbus_device, dev);
> -
> +	bool xen_suspend = xen_suspend_mode_is_xen_suspend();
>  	DPRINTK("%s", xdev->nodename);
>  
>  	if (dev->driver == NULL)
> @@ -627,24 +645,32 @@ int xenbus_dev_resume(struct device *dev)
>  	drv = to_xenbus_driver(dev->driver);
>  	err = talk_to_otherend(xdev);
>  	if (err) {
> -		pr_warn("resume (talk_to_otherend) %s failed: %i\n",
> +		pr_warn("%s (talk_to_otherend) %s failed: %i\n",


Please use dev_warn() everywhere, we just had a bunch of patches that
replaced pr_warn(). In fact,  this is one of the lines that got changed.


>  
>  int xenbus_dev_cancel(struct device *dev)
>  {
> -	/* Do nothing */
> -	DPRINTK("cancel");
> +	int err = 0;


Again, no need to initialize.


> +	struct xenbus_driver *drv;
> +	struct xenbus_device *xdev
> +		= container_of(dev, struct xenbus_device, dev);


xendev please to be consistent with other code. And use to_xenbus_device().


-boris