From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3A39117DFE7 for ; Tue, 2 Dec 2025 01:43:55 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764639835; cv=none; b=pyqad7lWD4C/awOr0PuD4SwCpKvtLuy1TqRWc4OrEX2dbQ/JrVI5Cz+NI1TCBIOQCHIE6vFSpRC2mbQEv6r4wvvQgvn256apxmCdgPASZOEfK1ZMFbjKOVMsNpl5y9xbn8u/mui3s05NDNmGPWsAluGEBNuysl3ZopscuNMHDLs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764639835; c=relaxed/simple; bh=J7/HyJYfd3EBCJQEhfxprc4HH1CP7UuxNxUaTiVt89M=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=FeyECIyIB4MfyEw4m5wrLKbxaacZvf5gcyIn7uxfO9/p0Y6RfYmmW+Po033wOvDkUFEyynaJJMiddtIsBU6dPISGcrIw4skXW4vd5+8BRiFOz9myXfbwh5NYch1ljs0Wk2jXSPwmltvgI5Y/u6xAyWiCPighl33ymFYy6fxB4zk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=nOCL4F1C; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="nOCL4F1C" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1307CC4CEF1; Tue, 2 Dec 2025 01:43:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1764639834; bh=J7/HyJYfd3EBCJQEhfxprc4HH1CP7UuxNxUaTiVt89M=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=nOCL4F1C5u3A1YQ7bDi4+lTqObDj1QSMuaUbFlMbpsVE4mbh2SC2nUr0aPIEkIDdx hKNcYUJUPqvNW9Y0z5b6iPP3ig8HPu7GBVIsfarC1R+wQLNbOxjTMo0nu7RPwchqn4 XksO9itP7Wq99OPDEEup4YS6yF0dM4h/OoU8xgEOIKq2P0027L3H7wuj6zYVJ4PgcP yuXh+XpPn3T24qON8s9jA9mXdby6G2t76peH/PrSQApJY2m0ZnXSXz93cbxdlkkAb4 RxsXBqdMcj8UDxG7OFirTqupCn+t8XCwzi9N3hDaIC9jAOFRTUciiePe+2PcT2kiUJ phM6quwycBMKg== From: Sasha Levin To: stable@vger.kernel.org Cc: Kuen-Han Tsai , Greg Kroah-Hartman , Sasha Levin Subject: [PATCH 6.17.y 1/2] usb: udc: Add trace event for usb_gadget_set_state Date: Mon, 1 Dec 2025 20:43:44 -0500 Message-ID: <20251202014345.1598525-1-sashal@kernel.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <2025120120-whooping-whole-a5b2@gregkh> References: <2025120120-whooping-whole-a5b2@gregkh> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Kuen-Han Tsai [ Upstream commit 7bf1158514e410310aec975e630cec99d4e4092f ] While the userspace program can be notified of gadget state changes, timing issue can lead to missed transitions when reading the state value. Introduce a trace event for usb_gadget_set_state to reliably track state transitions. Signed-off-by: Kuen-Han Tsai Link: https://lore.kernel.org/r/20250818082722.2952867-1-khtsai@google.com Signed-off-by: Greg Kroah-Hartman Stable-dep-of: baeb66fbd420 ("usb: gadget: udc: fix use-after-free in usb_gadget_state_work") Signed-off-by: Sasha Levin --- drivers/usb/gadget/udc/core.c | 1 + drivers/usb/gadget/udc/trace.h | 5 +++++ 2 files changed, 6 insertions(+) diff --git a/drivers/usb/gadget/udc/core.c b/drivers/usb/gadget/udc/core.c index e3d63b8fa0f4c..694653761c44c 100644 --- a/drivers/usb/gadget/udc/core.c +++ b/drivers/usb/gadget/udc/core.c @@ -1128,6 +1128,7 @@ void usb_gadget_set_state(struct usb_gadget *gadget, { gadget->state = state; schedule_work(&gadget->work); + trace_usb_gadget_set_state(gadget, 0); } EXPORT_SYMBOL_GPL(usb_gadget_set_state); diff --git a/drivers/usb/gadget/udc/trace.h b/drivers/usb/gadget/udc/trace.h index 4e334298b0e8a..fa3e6ddf0a128 100644 --- a/drivers/usb/gadget/udc/trace.h +++ b/drivers/usb/gadget/udc/trace.h @@ -81,6 +81,11 @@ DECLARE_EVENT_CLASS(udc_log_gadget, __entry->ret) ); +DEFINE_EVENT(udc_log_gadget, usb_gadget_set_state, + TP_PROTO(struct usb_gadget *g, int ret), + TP_ARGS(g, ret) +); + DEFINE_EVENT(udc_log_gadget, usb_gadget_frame_number, TP_PROTO(struct usb_gadget *g, int ret), TP_ARGS(g, ret) -- 2.51.0