linux-kernel - RE: [PATCH v3] usbnet/cdc_ncm: Don't use stack variables for DMA

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Message-ID: <2AC7D4AD8BA1C640B4C60C61C8E520153E3DEF67AF@EXDCVYMBSTM006.EQ1STM.local>
Date:	Tue, 2 Aug 2011 17:30:31 +0200
From:	Alexey ORISHKO <alexey.orishko@...ricsson.com>
To:	Joss Boyer <jwboyer@...hat.com>, Oliver Neukum <oliver@...kum.org>
Cc:	"gregkh@...e.de" <gregkh@...e.de>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v3] usbnet/cdc_ncm: Don't use stack variables for DMA

> -----Original Message-----
> From: Joss Boyer [mailto:jwboyer@...hat.com]
> Sent: Tuesday, August 02, 2011 4:48 PM
> To: Oliver Neukum; Alexey ORISHKO
> Cc: gregkh@...e.de; linux-usb@...r.kernel.org; linux-kernel@...r.kernel.org
> Subject: [PATCH v3] usbnet/cdc_ncm: Don't use stack variables for DMA
> 
> From 1717b6b8b1de95ed4ca53b74d2ccb563fae9b898 Mon Sep 17 00:00:00 2001
> From: Josh Boyer <jwboyer@...hat.com>
> Date: Tue, 2 Aug 2011 08:09:56 -0400
> Subject: [PATCH] usbnet/cdc_ncm: Don't use stack variables for DMA buffers
> 
> The cdc_ncm driver still has a few places where stack variables are passed
> to the cdc_ncm_do_request function.  This triggers a stack trace in
> lib/dma-debug.c if the CONFIG_DEBUG_DMA_API option is set.
> 
> Adjust these calls to pass parameters that have been allocated with kzalloc.
> 
> Signed-off-by: Josh Boyer <jwboyer@...hat.com>
> ---

Tested with hardware on Ubuntu 11.04 64-bit (no CONFIG_DEBUG_DMA_API flag)

/alexey
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