[PATCH 0/4] uio hotplug support

[Mandeep Sandhu]

I'm re-submitting this patch originally authored by Eric W. Biederman.

See: https://lkml.org/lkml/2010/9/20/21

<original-summary>
Implement the ability to hot-unplug a uio device while file handles
are still open, without crashing.

The "locking" for hotunplug support is implemented in
a generic library, that should be reusable to make this
kind of support easier to add in other pieces of the kernel.
</original-summary>

I have made minor modifications for making it compile with the latest
kernel version (3.19.0-rc2).

I have tested this patch on Greg's char-misc tree with a fake
hotplug driver that I wrote. The code for the fake hotplug driver is
available here:
https://github.com/mandeepsandhu/uio-hotplug-test

I would like to attribute the patch to Eric, as he's the original
author (and can possibly be the maintainer for fs/libunload.c?). I
can put my name in "Tested-by" if people are satisified with the fake
hotplug driver I wrote.


Mandeep Sandhu (4):
  uio: Simplify the lifetime logic of struct uio_device.
  uio: Remove unused uio_info mmap method.
  libunload: A library to help remove open files
  uio: Implement hotunplug support, using libunload

 drivers/uio/uio.c          | 305 ++++++++++++++++++++++++++++++++-------------
 fs/Makefile                |   2 +-
 fs/libunload.c             | 169 +++++++++++++++++++++++++
 include/linux/uio_driver.h |  16 +--
 include/linux/unload.h     |  35 ++++++
 5 files changed, 427 insertions(+), 100 deletions(-)
 create mode 100644 fs/libunload.c
 create mode 100644 include/linux/unload.h

-- 
1.9.1

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