linux-kernel - [PATCH 0/2] gpiolib: export the consumer's PID to user-space

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Message-Id: <20220909121329.42004-1-brgl@bgdev.pl>
Date:   Fri,  9 Sep 2022 14:13:27 +0200
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Kent Gibson <warthog618@...il.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Viresh Kumar <viresh.kumar@...aro.org>
Cc:     linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        Bartosz Golaszewski <brgl@...ev.pl>
Subject: [PATCH 0/2] gpiolib: export the consumer's PID to user-space

I've been asked several times independently over the course of last months
for a way to figure out the PID of the user-space process that's holding
a specific GPIO line. This does sound like a valid use-case as the user may
create a background process that requests some lines and then want to kill
it to release those lines.

These patches propose to extend the gpio_v2_line_info struct with the
consumer's PID which is set to the process ID for user-space consumers and
0 for kernel-space ones.

Bartosz Golaszewski (2):
  gpiolib: un-inline gpiod_request_user()
  gpiolib: cdev: export the consumer's PID

 drivers/gpio/gpiolib-cdev.c |  2 ++
 drivers/gpio/gpiolib.c      | 33 +++++++++++++++++++++++++++++----
 drivers/gpio/gpiolib.h      | 14 +++-----------
 include/uapi/linux/gpio.h   |  5 ++++-
 4 files changed, 38 insertions(+), 16 deletions(-)

-- 
2.34.1