netdev - Re: [PATCH] jme: Fix DMA unmap warning

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Message-Id: <20140507.164434.997979341700998470.davem@davemloft.net>
Date:	Wed, 07 May 2014 16:44:34 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	nhorman@...driver.com
Cc:	netdev@...r.kernel.org, cooldavid@...ldavid.org
Subject: Re: [PATCH] jme: Fix DMA unmap warning

From: Neil Horman <nhorman@...driver.com>
Date: Wed, 7 May 2014 16:33:17 -0400

> Perhaps a solution is a signalling mechanism tied to completion interrupts?
> I.e. a mapping failure gets reported to the stack, which causes the
> correspondnig queue to be stopped, until such time a the driver signals a safe
> restart by the reception of a tx completion interrupt?  I'm actually tinkering
> right now with a mechanism that provides guidance to the stack as to how many
> dma descriptors are available in a given net_device that might come in handy
> here

Another idea is to signal it from the IOMMU unmap itself, since that is the
point where the resource becomes available.

Actually either approach is fine with me.
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