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

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Date:   Thu, 11 Feb 2021 13:28:41 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Amey Narkhede' <ameynarkhede03@...il.com>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "dan.carpenter@...cle.com" <dan.carpenter@...cle.com>
CC:     "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

> 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?

For hci and lengths less than 8 the immediate data can be
placed directly in the ring structure replacing the data
pointer itself.

	David

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