linux-kernel - [PATCH v2 2/2] iio: imu: adis16460: use DEFINE_DEBUGFS_ATTRIBUTE instead of DEFINE_SIMPLE

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Date:   Tue, 31 Mar 2020 17:17:31 +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 2/2] iio: imu: adis16460: use DEFINE_DEBUGFS_ATTRIBUTE instead of DEFINE_SIMPLE_ATTRIBUTE

debugfs_create_file_unsafe does not protect the fops handed to it
against file removal. DEFINE_DEBUGFS_ATTRIBUTE makes the fops aware of
the file lifetime and thus protects it against removal.

Signed-off-by: Rohit Sarkar <rohitsarkar5398@...il.com>
---
 drivers/iio/imu/adis16460.c | 27 +++++++++++++++------------
 1 file changed, 15 insertions(+), 12 deletions(-)

diff --git a/drivers/iio/imu/adis16460.c b/drivers/iio/imu/adis16460.c
index 9539cfe4a259..f96cfd007957 100644
--- a/drivers/iio/imu/adis16460.c
+++ b/drivers/iio/imu/adis16460.c
@@ -87,8 +87,8 @@ static int adis16460_show_serial_number(void *arg, u64 *val)
 
 	return 0;
 }
-DEFINE_SIMPLE_ATTRIBUTE(adis16460_serial_number_fops,
-	adis16460_show_serial_number, NULL, "0x%.4llx\n");
+DEFINE_DEBUGFS_ATTRIBUTE(adis16460_serial_number_fops,
+		adis16460_show_serial_number, NULL, "0x%.4llx\n");
 
 static int adis16460_show_product_id(void *arg, u64 *val)
 {
@@ -105,8 +105,8 @@ static int adis16460_show_product_id(void *arg, u64 *val)
 
 	return 0;
 }
-DEFINE_SIMPLE_ATTRIBUTE(adis16460_product_id_fops,
-	adis16460_show_product_id, NULL, "%llu\n");
+DEFINE_DEBUGFS_ATTRIBUTE(adis16460_product_id_fops,
+		adis16460_show_product_id, NULL, "%llu\n");
 
 static int adis16460_show_flash_count(void *arg, u64 *val)
 {
@@ -123,19 +123,22 @@ static int adis16460_show_flash_count(void *arg, u64 *val)
 
 	return 0;
 }
-DEFINE_SIMPLE_ATTRIBUTE(adis16460_flash_count_fops,
-	adis16460_show_flash_count, NULL, "%lld\n");
+DEFINE_DEBUGFS_ATTRIBUTE(adis16460_flash_count_fops,
+		adis16460_show_flash_count, NULL, "%lld\n");
 
 static int adis16460_debugfs_init(struct iio_dev *indio_dev)
 {
 	struct adis16460 *adis16460 = iio_priv(indio_dev);
 
-	debugfs_create_file("serial_number", 0400, indio_dev->debugfs_dentry,
-		adis16460, &adis16460_serial_number_fops);
-	debugfs_create_file("product_id", 0400, indio_dev->debugfs_dentry,
-		adis16460, &adis16460_product_id_fops);
-	debugfs_create_file("flash_count", 0400, indio_dev->debugfs_dentry,
-		adis16460, &adis16460_flash_count_fops);
+	debugfs_create_file_unsafe("serial_number", 0400,
+			indio_dev->debugfs_dentry, adis16460,
+			&adis16460_serial_number_fops);
+	debugfs_create_file_unsafe("product_id", 0400,
+			indio_dev->debugfs_dentry, adis16460,
+			&adis16460_product_id_fops);
+	debugfs_create_file_unsafe("flash_count", 0400,
+			indio_dev->debugfs_dentry, adis16460,
+			&adis16460_flash_count_fops);
 
 	return 0;
 }
-- 
2.23.0.385.gbc12974a89