linux-kernel - [PATCH 00/15] drivers: usb: misc: update to use usb_control_msg

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Date:   Sun, 29 Nov 2020 21:35:57 +0530
From:   Anant Thazhemadam <anant.thazhemadam@...il.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Anant Thazhemadam <anant.thazhemadam@...il.com>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: [PATCH 00/15] drivers: usb: misc: update to use usb_control_msg_{send|recv}()


The new usb_control_msg_{send|recv}() API provides an improved way of 
using usb_control_msg(). Using this, short reads/writes are considered
as errors, data can be used off the stack, and the need for the calling
function to create a raw usb pipe is eliminated.
This patch series aims to update existing instances of usb_control_msg() 
in drivers/usb/misc to usb_control_msg_{send|recv}() appropriately, and
also update the return value checking mechanisms in place (if any), as
necessary so nothing breaks.

I was however unable to update one instance of usb_control_msg() in 
drivers/usb/misc/apple-mfi-fastcharge.c.

The return value checking mechanism present here, is as follows.
	if (retval) {
		dev_dbg(&mfi->udev->dev, "retval = %d\n", retval);
		return retval;
	}

	mfi->charge_type = val->intval;

	return 0;

This implies that mfi->charge_type = val->intval only when number of
bytes transferred = 0, and the return value is directly returned 
otherwise. Since the new API doesn't return the number of bytes 
transferred, I wasn't quite sure how this instance could be updated.
In case this check is logically incorrect, a patch with a fix 
can be sent in as well.


Anant Thazhemadam (15):
  usb: misc: appledisplay: update to use the
    usb_control_msg_{send|recv}() API
  usb: misc: cypress_cy7c63: update to use usb_control_msg_recv()
  usb: misc: cytherm: update to use usb_control_msg_recv()
  usb: misc: ehset: update to use the usb_control_msg_{send|recv}() API
  usb: misc: emi26: update to use usb_control_msg_send()
  usb: misc: emi62: update to use usb_control_msg_send()
  usb: misc: ezusb: update to use usb_control_msg_send()
  usb: misc: idmouse: update to use usb_control_msg_send()
  usb: misc: iowarrior: update to use the usb_control_msg_{send|recv}()
    API
  usb: misc: isight_firmware: update to use usb_control_msg_send()
  usb: misc: ldusb: update to use usb_control_msg_send()
  usb: misc: lvstest: update to use the usb_control_msg_{send|recv}()
    API
  usb: misc: trancevibrator: update to use usb_control_msg_send()
  usb: misc: usbsevseg: update to use usb_control_msg_send()
  usb: misc: usbtest: update to use the usb_control_msg_{send|recv}()
    API

 drivers/usb/misc/appledisplay.c    | 46 ++++++++------------
 drivers/usb/misc/cypress_cy7c63.c  | 10 ++---
 drivers/usb/misc/cytherm.c         | 42 +++++++++---------
 drivers/usb/misc/ehset.c           | 70 +++++++++++++-----------------
 drivers/usb/misc/emi26.c           | 14 +-----
 drivers/usb/misc/emi62.c           | 14 +-----
 drivers/usb/misc/ezusb.c           | 16 +------
 drivers/usb/misc/idmouse.c         |  5 ++-
 drivers/usb/misc/iowarrior.c       | 34 +++++++--------
 drivers/usb/misc/isight_firmware.c | 22 +++++-----
 drivers/usb/misc/ldusb.c           |  8 ++--
 drivers/usb/misc/lvstest.c         | 30 ++++++-------
 drivers/usb/misc/trancevibrator.c  |  6 +--
 drivers/usb/misc/usbsevseg.c       | 52 +++++++---------------
 drivers/usb/misc/usbtest.c         | 63 +++++++++++++--------------
 15 files changed, 180 insertions(+), 252 deletions(-)

-- 
2.25.1