From cc7ed49a7f39deafb33fc58d162a3365344c3458 Mon Sep 17 00:00:00 2001
From: Jiri Kosina <jkosina@suse.cz>
Date: Thu, 8 Nov 2018 22:38:42 +0100
Subject: HID: hidraw: enforce minors_lock locking via lockdep
lockdep is much more powerful enforcing the locking rules than code comments,
so let's switch to it.
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
---
drivers/hid/hidraw.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
(limited to 'drivers/hid')
diff --git a/drivers/hid/hidraw.c b/drivers/hid/hidraw.c
index 4a44e48e08b2..9fc51eff1079 100644
--- a/drivers/hid/hidraw.c
+++ b/drivers/hid/hidraw.c
@@ -107,8 +107,6 @@ out:
/*
* The first byte of the report buffer is expected to be a report number.
- *
- * This function is to be called with the minors_lock mutex held.
*/
static ssize_t hidraw_send_report(struct file *file, const char __user *buffer, size_t count, unsigned char report_type)
{
@@ -117,6 +115,8 @@ static ssize_t hidraw_send_report(struct file *file, const char __user *buffer,
__u8 *buf;
int ret = 0;
+ lockdep_assert_held(&minors_lock);
+
if (!hidraw_table[minor] || !hidraw_table[minor]->exist) {
ret = -ENODEV;
goto out;
@@ -181,8 +181,6 @@ static ssize_t hidraw_write(struct file *file, const char __user *buffer, size_t
* of buffer is the report number to request, or 0x0 if the defice does not
* use numbered reports. The report_type parameter can be HID_FEATURE_REPORT
* or HID_INPUT_REPORT.
- *
- * This function is to be called with the minors_lock mutex held.
*/
static ssize_t hidraw_get_report(struct file *file, char __user *buffer, size_t count, unsigned char report_type)
{
@@ -192,6 +190,8 @@ static ssize_t hidraw_get_report(struct file *file, char __user *buffer, size_t
int ret = 0, len;
unsigned char report_number;
+ lockdep_assert_held(&minors_lock);
+
if (!hidraw_table[minor] || !hidraw_table[minor]->exist) {
ret = -ENODEV;
goto out;
--
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