netdev - Re: PROBLEM: usbnet / ax88179_178a: Panic in usb_hcd_map_urb_for

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Message-ID: <87zjn086iz.fsf@nemi.mork.no>
Date:	Mon, 13 Jan 2014 12:28:52 +0100
From:	Bjørn Mork <bjorn@...k.no>
To:	David Laight <David.Laight@...LAB.COM>
Cc:	Thomas Kear <thomas@...r.co.nz>,
	Ben Hutchings <bhutchings@...arflare.com>,
	netdev <netdev@...r.kernel.org>,
	"linux-usb\@vger.kernel.org" <linux-usb@...r.kernel.org>
Subject: Re: PROBLEM: usbnet / ax88179_178a: Panic in usb_hcd_map_urb_for_dma

David Laight <David.Laight@...LAB.COM> writes:

> The patch you submitted is wrong.
> Whoever wrote the sg interface was on crack.
> The 'last' marker needs moving as well.

I'm afraid I don't understand what you meant by this.

sg_init_table() set the 'last' marker.  AFAICS, you don't need to change
it unless you want to chain lists.

Care to explain with some code?


Bjørn
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