linux-kernel - Re: [PATCH v4] staging: gdm724x: Fix DMA from stack

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Date:   Thu, 11 Feb 2021 14:52:12 +0100
From:   "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
To:     David Laight <David.Laight@...lab.com>
Cc:     'Amey Narkhede' <ameynarkhede03@...il.com>,
        "dan.carpenter@...cle.com" <dan.carpenter@...cle.com>,
        "devel@...verdev.osuosl.org" <devel@...verdev.osuosl.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>
Subject: Re: [PATCH v4] staging: gdm724x: Fix DMA from stack

On Thu, Feb 11, 2021 at 01:28:41PM +0000, David Laight wrote:
> > Stack allocated buffers cannot be used for DMA
> > on all architectures so allocate hci_packet buffer
> > using kmalloc.
> 
> I wonder if the usb stack ought/could support a short bounce
> buffer within the memory is already has to allocate?

No.