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[bpf-next,v10,08/23] HID: core: store the unique system identifier in hid_device

Message ID 20220902132938.2409206-9-benjamin.tissoires@redhat.com (mailing list archive)
State Changes Requested
Delegated to: BPF
Headers show
Series Introduce eBPF support for HID devices | expand

Checks

Context Check Description
bpf/vmtest-bpf-next-PR fail PR summary
netdev/tree_selection success Clearly marked for bpf-next, async
netdev/fixes_present success Fixes tag not required for -next series
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netdev/cover_letter success Series has a cover letter
netdev/patch_count fail Series longer than 15 patches (and no cover letter)
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 28 this patch: 28
netdev/cc_maintainers success CCed 4 of 4 maintainers
netdev/build_clang success Errors and warnings before: 9 this patch: 9
netdev/module_param success Was 0 now: 0
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netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 25 this patch: 25
netdev/checkpatch warning WARNING: line length of 94 exceeds 80 columns
netdev/kdoc success Errors and warnings before: 0 this patch: 0
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Commit Message

Benjamin Tissoires Sept. 2, 2022, 1:29 p.m. UTC 
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@linuxfoundation.org>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>

---

no changes in v10

no changes in v9

no changes in v8

no changes in v7

no changes in v6

new in v5
---
 drivers/hid/hid-core.c | 4 +++-
 include/linux/hid.h    | 2 ++
 2 files changed, 5 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index b7f5566e338d..a00dd43db8bf 100644
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -2739,10 +2739,12 @@  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 4363a63b9775..a43dd17bc78f 100644
--- a/include/linux/hid.h
+++ b/include/linux/hid.h
@@ -658,6 +658,8 @@  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) \