From nobody Wed Apr 1 12:33:43 2026 Received: from m16.mail.163.com (m16.mail.163.com [117.135.210.2]) (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 1B4F53CEB95; Tue, 31 Mar 2026 09:58:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=117.135.210.2 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774951134; cv=none; b=JTr8yE6MdE1KZM4KZfCw2RztTSVUFyKAm1dieyJo1ZHZ+13Jov0u59qwE6SGTIT7uQOukoYGjdmtVawbZ9BBpm7gu/GefziC6WNETBeRRiqTuwyWlF+OJK/h30+xUuw/RAypjqTl3bhJr553LMZW+LWS9cgF13YdpQml0HgX3jI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774951134; c=relaxed/simple; bh=0NawNje/+pvf6Q6m+KPbRXlZmC4DkAHWvaROaCKr6co=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=IpVw6yzTfdEx87jmMZm82M4Fz+zF9yNsUlUuw9pfbJkDdkqXg4G3o0nlNnlkkik5Kk+tLELZTlfMTnWEqkK6ZJmcDCYwvtv+gqLhREB7OrgT/FHZaJ09jfkJHQBhuzGzWnbOoxZ4TwvMxKj8Bg8z3udX1H0GUivd4U8T7DWTVF4= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=163.com; spf=pass smtp.mailfrom=163.com; dkim=pass (1024-bit key) header.d=163.com header.i=@163.com header.b=HlYo5aOW; arc=none smtp.client-ip=117.135.210.2 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=163.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=163.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=163.com header.i=@163.com header.b="HlYo5aOW" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=163.com; s=s110527; h=From:To:Subject:Date:Message-Id:MIME-Version; bh=kr ZVscrKa/upqABA+IvbisLz9PdxJNYlhS+Lp6nvk6w=; b=HlYo5aOWC+LQZUtC82 upBNbB+QEoQlrm8sl0vsIg9CrORpU0BiIV8QzDdwM7FA/Vkw2/VH3H7An6hFRvC/ U97CXGbryfB5KHgJ0PcqenABydoMIM4bG13MPgA4KUMuoWgu+NhihMx/LE6Touyx 0t7D+q/fFxskbO3MHK9jj4YiY= Received: from thinkpadx13gen2i.. (unknown []) by gzsmtp3 (Coremail) with SMTP id PigvCgCHZZLImstp55AwBg--.30556S2; Tue, 31 Mar 2026 17:58:36 +0800 (CST) From: Zongmin Zhou To: skhan@linuxfoundation.org Cc: gregkh@linuxfoundation.org, i@zenithal.me, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, min_halo@163.com, valentina.manea.m@gmail.com, Zongmin Zhou Subject: [PATCH v3] usbip: tools: add hint when no exported devices are found Date: Tue, 31 Mar 2026 17:58:30 +0800 Message-Id: <20260331095830.124543-1-min_halo@163.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <3ff00e2e-1c45-45be-a65c-16da9b2ae5a5@linuxfoundation.org> References: <3ff00e2e-1c45-45be-a65c-16da9b2ae5a5@linuxfoundation.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: PigvCgCHZZLImstp55AwBg--.30556S2 X-Coremail-Antispam: 1Uf129KBjvJXoW7Ar1rKFW8Xr47Xr17CF13CFg_yoW8WFy8pF WUJFWrKrW5AFnxua10yF48WFy0gws8t3y0gr1xGw1UuFnIyasIvr9ay3ZYka4rJr45Ja4I vFWDt3y7CFyUW3DanT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDUYxBIdaVFxhVjvjDU0xZFpf9x0pELvtJUUUUU= X-CM-SenderInfo: pplqsxxdorqiywtou0bp/xtbC8wwn0mnLmszxswAA38 Content-Type: text/plain; charset="utf-8" From: Zongmin Zhou When refresh_exported_devices() finds no devices, it's helpful to inform users about potential causes. This could be due to: 1. The usbip driver module is not loaded. 2. No devices have been exported yet. Add an informational message to guide users when ndevs =3D=3D 0. Message visibility by scenario: - usbipd (console mode): Show on console/serial, this allows instant visibility for debugging. - usbipd -D (daemon mode): Message logged to syslog, can keep logs for later traceability in production. Also can use "journalctl -f" to trace on console. Suggested-by: Shuah Khan Signed-off-by: Zongmin Zhou --- Changes in v3: - Just add an informational message when no devices are found. Changes in v2: - Use system calls directly instead of checking sysfs dir. tools/usb/usbip/libsrc/usbip_host_common.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/tools/usb/usbip/libsrc/usbip_host_common.c b/tools/usb/usbip/l= ibsrc/usbip_host_common.c index ca78aa368476..cd92baee310c 100644 --- a/tools/usb/usbip/libsrc/usbip_host_common.c +++ b/tools/usb/usbip/libsrc/usbip_host_common.c @@ -149,6 +149,13 @@ static int refresh_exported_devices(struct usbip_host_= driver *hdriver) } } =20 + if (hdriver->ndevs =3D=3D 0) { + if (!strcmp(hdriver->udev_subsystem, "usb")) + info("Please check if %s driver is loaded or export devices.",USBIP_HOS= T_DRV_NAME); + else + info("Please check if %s driver is loaded or export devices.",USBIP_DEV= ICE_DRV_NAME); + } + return 0; } =20 --=20 2.34.1