This is a note to let you know that I've just added the patch titled
HID: core: store the unique system identifier in hid_device
to the 5.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
hid-core-store-the-unique-system-identifier-in-hid_d.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit c6ef0d1811f541ca9c61681e8c679b8fc3855132
Author: Benjamin Tissoires <benjamin.tissoires@xxxxxxxxxx>
Date: Fri Sep 2 15:29:23 2022 +0200
HID: core: store the unique system identifier in hid_device
[ Upstream commit 1e839143d674603b0bbbc4c513bca35404967dbc ]
This unique identifier is currently used only for ensuring uniqueness in
sysfs. However, this could be handful for userspace to refer to a specific
hid_device by this id.
2 use cases are in my mind: LEDs (and their naming convention), and
HID-BPF.
Reviewed-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20220902132938.2409206-9-benjamin.tissoires@xxxxxxxxxx
Stable-dep-of: fc43e9c857b7 ("HID: fix HID device resource race between HID core and debugging support")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index 8248cdc30e1d3..af1e1922e1ae0 100644
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -2437,10 +2437,12 @@ int hid_add_device(struct hid_device *hdev)
hid_warn(hdev, "bad device descriptor (%d)\n", ret);
}
+ hdev->id = atomic_inc_return(&id);
+
/* XXX hack, any other cleaner solution after the driver core
* is converted to allow more than 20 bytes as the device name? */
dev_set_name(&hdev->dev, "%04X:%04X:%04X.%04X", hdev->bus,
- hdev->vendor, hdev->product, atomic_inc_return(&id));
+ hdev->vendor, hdev->product, hdev->id);
hid_debug_register(hdev, dev_name(&hdev->dev));
ret = device_add(&hdev->dev);
diff --git a/include/linux/hid.h b/include/linux/hid.h
index 20266127cf666..3fc4241cffbe2 100644
--- a/include/linux/hid.h
+++ b/include/linux/hid.h
@@ -622,6 +622,8 @@ struct hid_device { /* device report descriptor */
struct list_head debug_list;
spinlock_t debug_list_lock;
wait_queue_head_t debug_wait;
+
+ unsigned int id; /* system unique id */
};
#define to_hid_device(pdev) \
