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Date:	Thu, 16 Oct 2014 10:08:50 +0200 (CEST)
From:	Fabian Frederick <>
To:	Joe Perches <>,
	Bjørn Mork <>
	"John W. Linville" <>
Subject: Re: [PATCH 1/1 linux-next] zd1201: replace kmalloc/memset by

> On 14 October 2014 at 20:08 Bjørn Mork <> wrote:
> Joe Perches <> writes:
> > And does this really need to be alloc'd?
> Yes, it does. It is used as a transfer_buffer in usb_fill_bulk_urb() and
> must be "suitable for DMA".  From include/linux/usb.h:
> /**
>  * struct urb - USB Request Block
> ..
>  * @transfer_buffer:  This identifies the buffer to (or from) which the I/O
>  *      request will be performed unless URB_NO_TRANSFER_DMA_MAP is set
>  *      (however, do not leave garbage in transfer_buffer even then).
>  *      This buffer must be suitable for DMA; allocate it with
>  *      kmalloc() or equivalent.  For transfers to "in" endpoints, contents
>  *      of this buffer will be modified.  This buffer is used for the data
>  *      stage of control transfers.

Adding a structure would be a nice design update indeed but this would require
some testing...Separate patch maybe ?

> Bjørn
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