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usb: core: new quirk to handle devices with zero configurations 

Some USB devices incorrectly report bNumConfigurations as 0 in their
device descriptor, which causes the USB core to reject them during
enumeration.
logs:
usb 1-2: device descriptor read/64, error -71
usb 1-2: no configurations
usb 1-2: can't read configurations, error -22

However, these devices actually work correctly when
treated as having a single configuration.

Add a new quirk USB_QUIRK_FORCE_ONE_CONFIG to handle such devices.
When this quirk is set, assume the device has 1 configuration instead
of failing with -EINVAL.

This quirk is applied to the device with VID:PID 5131:2007 which
exhibits this behavior.

Signed-off-by: Jie Deng <dengjie03@kylinos.cn>
Link: https://patch.msgid.link/20260227084931.1527461-1-dengjie03@kylinos.cn
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jie Deng 2026-02-27 16:49:31 +08:00 committed by Greg Kroah-Hartman
parent 45dba8011e
commit 9f6a983cfa
4 changed files with 16 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
Documentation/admin-guide/kernel-parameters.txt
View File

@ -8183,6 +8183,9 @@ Kernel parameters
p = USB_QUIRK_SHORT_SET_ADDRESS_REQ_TIMEOUT
(Reduce timeout of the SET_ADDRESS
request from 5000 ms to 500 ms);
q = USB_QUIRK_FORCE_ONE_CONFIG (Device
claims zero configurations,
forcing to 1);
Example: quirks=0781:5580:bk,0a5c:5834:gij
usbhid.mousepoll=

6
drivers/usb/core/config.c
View File

@ -927,7 +927,11 @@ int usb_get_configuration(struct usb_device *dev)
dev->descriptor.bNumConfigurations = ncfg = USB_MAXCONFIG;
}
if (ncfg < 1) {
if (ncfg < 1 && dev->quirks & USB_QUIRK_FORCE_ONE_CONFIG) {
dev_info(ddev, "Device claims zero configurations, forcing to 1\n");
dev->descriptor.bNumConfigurations = 1;
ncfg = 1;
} else if (ncfg < 1) {
dev_err(ddev, "no configurations\n");
return -EINVAL;
}

5
drivers/usb/core/quirks.c
View File

@ -140,6 +140,8 @@ static int quirks_param_set(const char *value, const struct kernel_param *kp)
case 'p':
flags |= USB_QUIRK_SHORT_SET_ADDRESS_REQ_TIMEOUT;
break;
case 'q':
flags |= USB_QUIRK_FORCE_ONE_CONFIG;
/* Ignore unrecognized flag characters */
}
}
@ -589,6 +591,9 @@ static const struct usb_device_id usb_quirk_list[] = {
/* VCOM device */
{ USB_DEVICE(0x4296, 0x7570), .driver_info = USB_QUIRK_CONFIG_INTF_STRINGS },
/* Noji-MCS SmartCard Reader */
{ USB_DEVICE(0x5131, 0x2007), .driver_info = USB_QUIRK_FORCE_ONE_CONFIG },
/* INTEL VALUE SSD */
{ USB_DEVICE(0x8086, 0xf1a5), .driver_info = USB_QUIRK_RESET_RESUME },

3
include/linux/usb/quirks.h
View File

@ -78,4 +78,7 @@
/* skip BOS descriptor request */
#define USB_QUIRK_NO_BOS BIT(17)
/* Device claims zero configurations, forcing to 1 */
#define USB_QUIRK_FORCE_ONE_CONFIG BIT(18)
#endif /* __LINUX_USB_QUIRKS_H */