netdev - Re: netpoll + xmit

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Message-Id: <20090802.130704.133993421.davem@davemloft.net>
Date:	Sun, 02 Aug 2009 13:07:04 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	herbert@...dor.apana.org.au
Cc:	mpm@...enic.com, netdev@...r.kernel.org, mcarlson@...adcom.com
Subject: Re: netpoll + xmit_lock == deadlock

From: Herbert Xu <herbert@...dor.apana.org.au>
Date: Wed, 29 Jul 2009 15:35:23 +0800

> So if a driver is in the TX path, and a printk occurs, then a
> recursive dead lock can occur if that driver tries to take the
> xmit lock in its poll function to clean up descriptors.

My position has always been that such printk's are simply
not allowed.  (check archives if you don't believe me :-)

The locking is going to get rediculious if we start having
to account for this.
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