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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 == 0. Also update the condition in usbip_host_driver_open() and usbip_device_driver_open() to check both ret and ndevs == 0, and change err() to info(). 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 <skhan@linuxfoundation.org> Signed-off-by: Zongmin Zhou <zhouzongmin@kylinos.cn> Reviewed-by: Shuah Khan <skhan@linuxfoundation.org> Link: https://patch.msgid.link/20260402083204.53179-1-min_halo@163.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
55 lines
1.4 KiB
C
55 lines
1.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) 2011 matt mooney <mfm@muteddisk.com>
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* 2005-2007 Takahiro Hirofuchi
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* Copyright (C) 2015-2016 Samsung Electronics
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* Igor Kotrasinski <i.kotrasinsk@samsung.com>
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* Krzysztof Opasiak <k.opasiak@samsung.com>
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*/
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#include <unistd.h>
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#include <libudev.h>
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#include "usbip_host_common.h"
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#include "usbip_host_driver.h"
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#undef PROGNAME
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#define PROGNAME "libusbip"
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static int is_my_device(struct udev_device *dev)
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{
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const char *driver;
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driver = udev_device_get_driver(dev);
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return driver != NULL && !strcmp(driver, USBIP_HOST_DRV_NAME);
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}
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static int usbip_host_driver_open(struct usbip_host_driver *hdriver)
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{
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int ret;
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hdriver->ndevs = 0;
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INIT_LIST_HEAD(&hdriver->edev_list);
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ret = usbip_generic_driver_open(hdriver);
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if (ret || hdriver->ndevs == 0)
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info("please load " USBIP_CORE_MOD_NAME ".ko and "
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USBIP_HOST_DRV_NAME ".ko");
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return ret;
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}
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struct usbip_host_driver host_driver = {
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.edev_list = LIST_HEAD_INIT(host_driver.edev_list),
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.udev_subsystem = "usb",
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.ops = {
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.open = usbip_host_driver_open,
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.close = usbip_generic_driver_close,
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.refresh_device_list = usbip_generic_refresh_device_list,
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.get_device = usbip_generic_get_device,
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.read_device = read_usb_device,
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.read_interface = read_usb_interface,
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.is_my_device = is_my_device,
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},
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};
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