linux-kernel - Re: [PATCH 115/206] Staging: hv: Use completion abstraction in struct netvsc

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Date:	Tue, 10 May 2011 03:06:46 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	"K. Y. Srinivasan" <kys@...rosoft.com>
Cc:	gregkh@...e.de, linux-kernel@...r.kernel.org,
	devel@...uxdriverproject.org, virtualization@...ts.osdl.org,
	Haiyang Zhang <haiyangz@...rosoft.com>,
	Abhishek Kane <v-abkane@...rosoft.com>,
	Hank Janssen <hjanssen@...rosoft.com>
Subject: Re: [PATCH 115/206] Staging: hv: Use completion abstraction in
 struct netvsc_device

> -	net_device->wait_condition = 0;
>  	ret = vmbus_sendpacket(device->channel, init_packet,
>  			       sizeof(struct nvsp_message),
>  			       (unsigned long)init_packet,
> @@ -272,10 +272,8 @@ static int netvsc_init_recv_buf(struct hv_device *device)
>  		goto cleanup;
>  	}
>  
> -	wait_event_timeout(net_device->channel_init_wait,
> -			net_device->wait_condition,
> -			msecs_to_jiffies(1000));
> -	BUG_ON(net_device->wait_condition == 0);
> +	t = wait_for_completion_timeout(&net_device->channel_init_wait, HZ);
> +	BUG_ON(t == 0);

I don't think you want a BUG_ON here, but rather fail the
initialization.

Also I think you really should add synchronous versions of
vmbus_sendpacket*, to the vmbus core so that all the synchronous waiting
can be consolidated into a few helpers instead of needing to opencode
it everywhere.

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