HID: debug: Use the __set_current_state()

When detecting an invalid list->hdev, the process needs to manually set
its state to TASK_RUNNING and exit. In the original code,
set_current_state() (which includes a memory barrier) is used here, but
it is immediately followed by a mutex_unlock() call. Since
mutex_unlock() internally includes a memory barrier, this ensures that
all modifications within the critical section (including the process
state) are visible to other CPUs. Therefore, replacing it with
__set_current_state() (without an implicit barrier) avoids redundant
memory barriers.

Signed-off-by: Zihuan Zhang <[email protected]>
Signed-off-by: Jiri Kosina <[email protected]>

Author: Zihuan Zhang

drivers/hid/hid-debug.c

@@ -3726,7 +3726,7 @@ static ssize_t hid_debug_events_read(struct file *file, char __user *buffer,
 			 */
 			if (!list->hdev || !list->hdev->debug) {
 				ret = -EIO;
-				set_current_state(TASK_RUNNING);
+				__set_current_state(TASK_RUNNING);
 				goto out;
 			}