netdev - Re: [PATCH V2] cdc_ncm: Add support for moving NDP to end of NCM frame

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Message-ID: <1436177296.8225.25.camel@suse.com>
Date:	Mon, 06 Jul 2015 12:08:16 +0200
From:	Oliver Neukum <oneukum@...e.com>
To:	Enrico Mioso <mrkiko.rs@...il.com>
Cc:	linux-usb@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH V2] cdc_ncm: Add support for moving NDP to end of NCM
 frame

On Sun, 2015-07-05 at 12:21 +0200, Enrico Mioso wrote:
> When sending lots of small packets, this patch will generate an "Unable to 
> handle kernel paging request" in the memset call:
> ndp16 = memset(ctx->delayed_ndp16, 0, ctx->max_ndp_size);
> And I don't know why.
> Any comment or suggestion would be greatly apreciated.
> This has been reproduced in a QEMU X86 VM, from kernel 4.0.4 to current git.

I cannot see how this can fail and the preceding copy work.
Can you post the full message?

	Regards
		Oliver


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