Leonid Lobachev 0eed9a4ce3 usb: fix descriptors parsing for interfaces with multiple alternative settings. ... Previous code assumed there's a single InterfaceDescriptor per ConfigDescriptor's bNumInterfaces. Which means they can only have a single alternative setting. However that isn't always the case. For example Logitech C930E webcam has the following configuration: Device Descriptor: bNumConfigurations 1 Configuration Descriptor: bNumInterfaces 4 Interface Descriptor: bInterfaceNumber 0 bAlternateSetting 0 Interface Descriptor: bInterfaceNumber 1 bAlternateSetting 0 Interface Descriptor: bInterfaceNumber 1 bAlternateSetting 1 <skipped> Interface Descriptor: bInterfaceNumber 1 bAlternateSetting 11 Interface Descriptor: bInterfaceNumber 2 bAlternateSetting 0 Interface Descriptor: bInterfaceNumber 3 bAlternateSetting 0 Interface Descriptor: bInterfaceNumber 3 bAlternateSetting 1 <skipped> Trying to attach a device where this isn't true led to errors like this: [transfer_ring_controller.rs:50] failed to send transfer to backend Tested by attaching Logitech C930E webcam to VM and ./ci/builder 'cargo test -p usb_util' Change-Id: Iab671bff26558838becbbafe0a43ed6dc220306c Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/2983386 Tested-by: kokoro <noreply+kokoro@google.com> Commit-Queue: Leonid Lobachev <leonidl@google.com> Reviewed-by: Daniel Verkamp <dverkamp@chromium.org>		2021-07-09 23:44:58 +00:00
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src
Cargo.toml