netdev - Re: [PATCH net] cxgb4vf: Implement mailbox access locking and list management

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Date:	Tue, 14 Apr 2015 14:29:16 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	hariprasad@...lsio.com
Cc:	netdev@...r.kernel.org, leedom@...lsio.com, nirranjan@...lsio.com
Subject: Re: [PATCH net] cxgb4vf: Implement mailbox access locking and list
 management

From: Hariprasad Shenai <hariprasad@...lsio.com>
Date: Tue, 14 Apr 2015 18:00:45 +0530

> +	for (i = 0; ; i += ms) {
> +		/* If we've waited too long, return a busy indication.  This
> +		 * really ought to be based on our initial position in the
> +		 * mailbox access list but this is a start.  We very rarely
> +		 * contend on access to the mailbox ...
> +		 */
> +		if (i > 4 * FW_CMD_MAX_TIMEOUT) {

So you're going to sit here potentially polling for 40000 ms in a non-preemptable
context?

I don't think so...
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