netdev - Re: [PATCH v4] netpoll: protect napi_poll and poll_controller during dev

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Date:	Sun, 03 Feb 2013 16:05:58 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	nhorman@...driver.com
Cc:	netdev@...r.kernel.org, ivecera@...hat.com,
	bhutchings@...arflare.com, romieu@...zoreil.com,
	eric.dumazet@...il.com
Subject: Re: [PATCH v4] netpoll: protect napi_poll and poll_controller
 during dev_[open|close]

From: Neil Horman <nhorman@...driver.com>
Date: Sat,  2 Feb 2013 13:51:16 -0500

> I can't say Im a huge fan of returning -EBUSY in open/close, but I
> like it better than busy waiting while the poll path completes.

Sorry Neil, this is a show stopper for me.

There is no reason why, just because of bad timing, a device open or
close that would normally succeed, should fail.  And this situation is
only being created because the mutual exclusion and context handling
is "hard", well that's too bad :-)
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