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lx_emul: skip USB config setting if already set

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Skip SET_CONFIGURATION requests if the device already has the selected
config as active config. This workaround prevents issues with Linux
guests in VirtualBox and SDC-reader passthrough.

Thanks to Peter for the patch.
This commit is contained in:
Christian Helmuth 2022-08-08 14:20:07 +02:00
parent 3d8c1080b1
commit 1dd69eeb6c
1 changed files with 11 additions and 0 deletions
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11
repos/dde_linux/src/lib/lx_emul/usb.c
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@ -366,6 +366,17 @@ static genode_usb_request_ret_t
handle_config_request(unsigned cfg_idx, void * data)
{
struct usb_device * udev = (struct usb_device *) data;
if (udev && udev->actconfig
&& udev->actconfig->desc.bConfigurationValue == cfg_idx) {
/*
* Skip SET_CONFIGURATION requests if the device already has the
* selected config as active config. This workaround prevents issues
* with Linux guests in vbox and SDC-reader passthrough.
*/
return NO_ERROR;
}
return (usb_set_configuration(udev, cfg_idx)) ? UNKNOWN_ERROR : NO_ERROR;
}