From: Benjamin Tissoires Date: Fri, 2 Sep 2022 13:29:23 +0000 (+0200) Subject: HID: core: store the unique system identifier in hid_device X-Git-Tag: v5.15.141~58 X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=52badc06b119da3c559a4b835334cc70d4561b4b;p=thirdparty%2Fkernel%2Fstable.git 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 Signed-off-by: Benjamin Tissoires Link: https://lore.kernel.org/r/20220902132938.2409206-9-benjamin.tissoires@redhat.com Stable-dep-of: fc43e9c857b7 ("HID: fix HID device resource race between HID core and debugging support") Signed-off-by: Sasha Levin --- diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c index d941023c56289..35046adf1294e 100644 --- a/drivers/hid/hid-core.c +++ b/drivers/hid/hid-core.c @@ -2442,10 +2442,12 @@ 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 c3478e396829e..4fa40d2e821f2 100644 --- a/include/linux/hid.h +++ b/include/linux/hid.h @@ -630,6 +630,8 @@ 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) \