usbip host binds to devices attached to vhci_hcd on the same server when user does attach over localhost or specifies the server as the remote.
usbip attach -r localhost -b busid or usbip attach -r servername (or server IP)
Unbind followed by bind works, however device is left in a bad state with accesses via the attached busid result in errors and system hangs during shutdown.
Fix it to check and bail out if the device is already attached to vhci_hcd.
Cc: stable@vger.kernel.org Signed-off-by: Shuah Khan shuahkh@osg.samsung.com --- tools/usb/usbip/src/usbip_bind.c | 9 +++++++++ 1 file changed, 9 insertions(+)
diff --git a/tools/usb/usbip/src/usbip_bind.c b/tools/usb/usbip/src/usbip_bind.c index fa46141ae68b..e121cfb1746a 100644 --- a/tools/usb/usbip/src/usbip_bind.c +++ b/tools/usb/usbip/src/usbip_bind.c @@ -144,6 +144,7 @@ static int bind_device(char *busid) int rc; struct udev *udev; struct udev_device *dev; + const char *devpath;
/* Check whether the device with this bus ID exists. */ udev = udev_new(); @@ -152,8 +153,16 @@ static int bind_device(char *busid) err("device with the specified bus ID does not exist"); return -1; } + devpath = udev_device_get_devpath(dev); udev_unref(udev);
+ /* If the device is already attached to vhci_hcd - bail out */ + if (strstr(devpath, USBIP_VHCI_DRV_NAME)) { + err("bind loop detected: device: %s is attached to %s\n", + devpath, USBIP_VHCI_DRV_NAME); + return -1; + } + rc = unbind_other(busid); if (rc == UNBIND_ST_FAILED) { err("could not unbind driver from device on busid %s", busid);