linux-kernel - [PATCH v2 0/2] usb: core: Improve device lifecycle debuggability

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Message-ID: <20251015-usbcore-tracing-v2-0-5a14b5b9d4e0@google.com>
Date: Wed, 15 Oct 2025 03:50:50 +0800
From: Kuen-Han Tsai <khtsai@...gle.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
	Mathias Nyman <mathias.nyman@...ux.intel.com>, Alan Stern <stern@...land.harvard.edu>
Cc: linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Kuen-Han Tsai <khtsai@...gle.com>
Subject: [PATCH v2 0/2] usb: core: Improve device lifecycle debuggability

This series enhances USB core debuggability. The first patch refactors
device state updates into a new update_usb_device_state() helper 
function, centralizing logic and preparing for tracing.

The second patch adds tracepoints for USB device allocation and state 
changes, providing better visibility into the device lifecycle.

Signed-off-by: Kuen-Han Tsai <khtsai@...gle.com>
---
Changes in v2:
- hub.c: Changed the inline function to a standard one.
- Makefile: Moved trace.o to the preceding line.
- trace.h: Changed the speed and state into strings.
- Link to v1: https://lore.kernel.org/r/20251013-usbcore-tracing-v1-0-b885a3121b09@google.com

---
Kuen-Han Tsai (2):
      usb: core: Centralize device state update logic
      usb: core: Add tracepoints for device allocation and state changes

 drivers/usb/core/Makefile |  5 +++-
 drivers/usb/core/hub.c    | 30 +++++++++++++----------
 drivers/usb/core/trace.c  |  6 +++++
 drivers/usb/core/trace.h  | 61 +++++++++++++++++++++++++++++++++++++++++++++++
 drivers/usb/core/usb.c    |  2 ++
 5 files changed, 91 insertions(+), 13 deletions(-)
---
base-commit: 5472d60c129f75282d94ae5ad072ee6dfb7c7246
change-id: 20251012-usbcore-tracing-76f00c9b2b3e

Best regards,
-- 
Kuen-Han Tsai <khtsai@...gle.com>