linux-kernel - [PATCH v2 00/15] drivers: usb: misc: update to use usb_control_msg

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Message-Id: <20201130011819.2576481-1-anant.thazhemadam@gmail.com>
Date:   Mon, 30 Nov 2020 06:48:04 +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 v2 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.

Changes in v2:

  * Buffer variables that were previously dynamically allocated are no
    longer dynamically allocated unless they have a variable length
    (since that threw a warning).
    

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  |  21 ++---
 drivers/usb/misc/cytherm.c         | 128 ++++++++++-------------------
 drivers/usb/misc/ehset.c           |  76 ++++++++---------
 drivers/usb/misc/emi26.c           |  31 ++-----
 drivers/usb/misc/emi62.c           |  30 ++-----
 drivers/usb/misc/ezusb.c           |  16 +---
 drivers/usb/misc/idmouse.c         |   5 +-
 drivers/usb/misc/iowarrior.c       |  34 ++++----
 drivers/usb/misc/isight_firmware.c |  30 +++----
 drivers/usb/misc/ldusb.c           |   8 +-
 drivers/usb/misc/lvstest.c         |  38 ++++-----
 drivers/usb/misc/trancevibrator.c  |   4 +-
 drivers/usb/misc/usbsevseg.c       |  60 ++++----------
 drivers/usb/misc/usbtest.c         |  69 +++++++---------
 15 files changed, 216 insertions(+), 380 deletions(-)

-- 
2.25.1