Hi, I discovered that on some PC's the USB stack would produce an invalid descriptor upon query without an error. I don't know why this is the case, maybe broken hardware but I seriously doubt it. GRUB doesn't handle TT's at all, Clearing TT's or resetting them. Maybe thats a case for stuck transactions? The descriptor would contain 0 in length, or atleast the code would think that offset was the length and cause an endless loop. Maybe this type of parsing is completely avoidable but for now I just added a break condition. GRUB should not hang on faulty devices.
BR, Christian
usb-invalid-desc.patch
Description: usb-invalid-desc.patch
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