netdev - RE: [PATCH net 2/4] hv_netvsc: reset vf

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Message-ID: <CO2PR11MB008839DC3A61A4F211CC148F971E0@CO2PR11MB0088.namprd11.prod.outlook.com>
Date:	Thu, 11 Aug 2016 11:46:18 +0000
From:	Yuval Mintz <Yuval.Mintz@...gic.com>
To:	Vitaly Kuznetsov <vkuznets@...hat.com>,
	netdev <netdev@...r.kernel.org>
CC:	"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Haiyang Zhang <haiyangz@...rosoft.com>,
	"K. Y. Srinivasan" <kys@...rosoft.com>
Subject: RE: [PATCH net 2/4] hv_netvsc: reset vf_inject on VF removal

> +static void netvsc_inject_enable(struct net_device_context
> +*net_device_ctx) {
> +	net_device_ctx->vf_inject = true;
> +}
> +
> +static void netvsc_inject_disable(struct net_device_context
> +*net_device_ctx) {
> +	net_device_ctx->vf_inject = false;
> +
> +	/* Wait for currently active users to drain out. */
> +	while (atomic_read(&net_device_ctx->vf_use_cnt) != 0)
> +		udelay(50);
> +}

That was already the behavior before, but are you certain you
want to unconditionally block without any possible timeout?