linux-kernel - [PATCH 0/4] HID: fix few non-DMA capable HID transfers

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Date:   Mon, 21 Nov 2016 11:48:38 +0100
From:   Benjamin Tissoires <benjamin.tissoires@...hat.com>
To:     Jiri Kosina <jikos@...nel.org>
Cc:     linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 0/4] HID: fix few non-DMA capable HID transfers

Hi Jiri,

While playing a little bit with the CP2112 (for hid-rmi I must confess), I
realized that kernel v4.9 now enforces DMA capable buffers when calling
hid_hw_raw_request(). Kernel v4.8 works fine (but gives a stacktrace the first
time), but v4.9 doesn't.

So I gave a check of all the other drivers in the HID tree, and it looks like
only 4 drivers are not properly allocating their buffers.

I'd say this is v4.9 material but I was not able to test magicmouse and lg.
If this doesn't qualifies for 4.9-rc7, I think we should add the stable@ stamp,
given that the chance this will break hid-rmi is huge (cp2112 is not so much an
issue, given it's a devel board).

Cheers,
Benjamin

Benjamin Tissoires (4):
  HID: cp2112: make transfer buffers DMA capable
  HID: lg: make transfer buffers DMA capable
  HID: magicmouse: make transfer buffers DMA capable
  HID: rmi: make transfer buffers DMA capable

 drivers/hid/hid-cp2112.c     | 115 +++++++++++++++++++++++++++++--------------
 drivers/hid/hid-lg.c         |  12 +++--
 drivers/hid/hid-magicmouse.c |  12 ++++-
 drivers/hid/hid-rmi.c        |  10 +++-
 4 files changed, 106 insertions(+), 43 deletions(-)

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2.7.4