[PATCH AUTOSEL 6.8 04/24] usb: misc: uss720: check for incompatible versions of the Belkin F5U002

Sasha Levin
2024-06-05T11:51:11Z

From: Alex Henrie <alexhenrie24@gmail.com>

[ Upstream commit 3295f1b866bfbcabd625511968e8a5c541f9ab32 ]

The incompatible device in my possession has a sticker that says
"F5U002 Rev 2" and "P80453-B", and lsusb identifies it as
"050d:0002 Belkin Components IEEE-1284 Controller". There is a bug
report from 2007 from Michael Trausch who was seeing the exact same
errors that I saw in 2024 trying to use this cable.

Link: https://lore.kernel.org/all/46DE5830.9060401@trausch.us/
Signed-off-by: Alex Henrie <alexhenrie24@gmail.com>
Link: https://lore.kernel.org/r/20240326150723.99939-5-alexhenrie24@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/usb/misc/uss720.c | 20 +++++++++++++-------
1 file changed, 13 insertions(+), 7 deletions(-)

diff --git a/drivers/usb/misc/uss720.c b/drivers/usb/misc/uss720.c
index b00d92db5dfd1..eb5a8e0d9e2d6 100644
--- a/drivers/usb/misc/uss720.c
+++ b/drivers/usb/misc/uss720.c
@@ -677,7 +677,7 @@ static int uss720_probe(struct usb_interface *intf,
struct parport_uss720_private *priv;
struct parport *pp;
unsigned char reg;
- int i;
+ int ret;

dev_dbg(&intf->dev, "probe: vendor id 0x%x, device id 0x%x\n",
le16_to_cpu(usbdev->descriptor.idVendor),
@@ -688,8 +688,8 @@ static int uss720_probe(struct usb_interface *intf,
usb_put_dev(usbdev);
return -ENODEV;
}
- i = usb_set_interface(usbdev, intf->altsetting->desc.bInterfaceNumber, 2);
- dev_dbg(&intf->dev, "set interface result %d\n", i);
+ ret = usb_set_interface(usbdev, intf->altsetting->desc.bInterfaceNumber, 2);
+ dev_dbg(&intf->dev, "set interface result %d\n", ret);

interface = intf->cur_altsetting;

@@ -725,12 +725,18 @@ static int uss720_probe(struct usb_interface *intf,
set_1284_register(pp, 7, 0x00, GFP_KERNEL);
set_1284_register(pp, 6, 0x30, GFP_KERNEL); /* PS/2 mode */
set_1284_register(pp, 2, 0x0c, GFP_KERNEL);
- /* debugging */
- get_1284_register(pp, 0, &reg, GFP_KERNEL);
+
+ /* The Belkin F5U002 Rev 2 P80453-B USB parallel port adapter shares the
+ * device ID 050d:0002 with some other device that works with this
+ * driver, but it itself does not. Detect and handle the bad cable
+ * here. */
+ ret = get_1284_register(pp, 0, &reg, GFP_KERNEL);
dev_dbg(&intf->dev, "reg: %7ph\n", priv->reg);
+ if (ret < 0)
+ return ret;

- i = usb_find_last_int_in_endpoint(interface, &epd);
- if (!i) {
+ ret = usb_find_last_int_in_endpoint(interface, &epd);
+ if (!ret) {
dev_dbg(&intf->dev, "epaddr %d interval %d\n",
epd->bEndpointAddress, epd->bInterval);
}
--
2.43.0