[RFC]fix races in and improve CDC-WDM

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To: penguin-kernel@xxxxxxxxxxxxxxxxxxx, bjorn@xxxxxxx, linux-usb@xxxxxxxxxxxxxxx
Subject: [RFC]fix races in and improve CDC-WDM
From: Oliver Neukum <oneukum@xxxxxxxx>
Date: Mon, 21 Sep 2020 13:20:44 +0200

Tests in multithreaded environments and a thorough review have
shown hangs and other issues in the driver

This version introduces nicer locking

Follow-Ups:
- [RFC 2/8] CDC-WDM: introduce a timeout in flush()
  - From: Oliver Neukum
- [RFC 6/8] CDC-WDM: correct error reporting in write()
  - From: Oliver Neukum
- [RFC 7/8] CDC-WDM: implement fsync
  - From: Oliver Neukum
- [RFC 4/8] CDC-WDM: remove use of intf->dev after potential disconnect
  - From: Oliver Neukum
- [RFC 8/8] CDC-WDM: reduce scope of wdm_mutex
  - From: Oliver Neukum
- [RFC 3/8] CDC-WDM: making flush() interruptible
  - From: Oliver Neukum
- [RFC 5/8] CDC-WDM: fix race reporting errors in flush
  - From: Oliver Neukum
- [RFC 1/8] CDC-WDM: fix hangs in flush()
  - From: Oliver Neukum

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