linux-kernel - [PATCH v2 0/2] use DEFINE_DEBUGFS_ATTRIBUTE instead of DEFINE_SIMPLE

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Date:   Tue, 31 Mar 2020 17:17:29 +0530
From:   Rohit Sarkar <rohitsarkar5398@...il.com>
To:     linux-iio@...r.kernel.org
Cc:     dragos.bogdan@...log.com, Rohit Sarkar <rohitsarkar5398@...il.com>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Michael Hennerich <Michael.Hennerich@...log.com>,
        Stefan Popa <stefan.popa@...log.com>,
        Jonathan Cameron <jic23@...nel.org>,
        Hartmut Knaack <knaack.h@....de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 0/2] use DEFINE_DEBUGFS_ATTRIBUTE instead of DEFINE_SIMPLE_ATTRIBUTE

The debugfs_create_file_unsafe method does not protect the fops given to
it from file removal. It must be used with DEFINE_DEBUGFS_ATTRIBUTE
which makes the fops aware of the file lifetime.

Further using DEFINE_DEBUGFS_ATTRIBUTE along with
debugfs_create_file_unsafe significantly reduces the overhead introduced by
debugfs_create_file which creates a lifetime managing proxy around each
fops handed in. Refer [1] for more on this.

Fixes the following warnings reported by coccinelle:
drivers/iio/imu//adis16460.c:126:0-23: WARNING: adis16460_flash_count_fops should be defined with DEFINE_DEBUGFS_ATTRIBUTE
drivers/iio/imu//adis16460.c:108:0-23: WARNING: adis16460_product_id_fops should be defined with DEFINE_DEBUGFS_ATTRIBUTE
drivers/iio/imu//adis16460.c:90:0-23: WARNING: adis16460_serial_number_fops should be defined with DEFINE_DEBUGFS_ATTRIBUTE
drivers/iio/imu//adis16400.c:278:0-23: WARNING: adis16400_flash_count_fops should be defined with DEFINE_DEBUGFS_ATTRIBUTE
drivers/iio/imu//adis16400.c:261:0-23: WARNING: adis16400_product_id_fops should be defined with DEFINE_DEBUGFS_ATTRIBUTE

[1]: https://lists.gt.net/linux/kernel/2369498

Changelog v1 -> v2
* Use debugfs_create_file_unsafe instead of debugfs_create_file

Rohit Sarkar (2):
  iio: imu: adis16400: use DEFINE_DEBUGFS_ATTRIBUTE instead of
    DEFINE_SIMPLE_ATTRIBUTE
  iio: imu: adis16460: use DEFINE_DEBUGFS_ATTRIBUTE instead of
    DEFINE_SIMPLE_ATTRIBUTE

 drivers/iio/imu/adis16400.c | 19 ++++++++++---------
 drivers/iio/imu/adis16460.c | 27 +++++++++++++++------------
 2 files changed, 25 insertions(+), 21 deletions(-)

-- 
2.23.0.385.gbc12974a89