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genode_c_api/usb: fix size calculation of isoc_payload

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simplify and fix wrong calculation of 'size' for isoc_payload.
This commit is contained in:
Sebastian Sumpf 2025-02-13 11:57:54 +01:00 committed by Christian Helmuth
parent 31a5597f66
commit 13eef6a87a
1 changed files with 8 additions and 6 deletions
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14
repos/os/src/lib/genode_c_api/usb.cc
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@ -813,13 +813,15 @@ Interface_component::_handle_request(Constructible<Packet_descriptor> &cpd,
{
genode_usb_isoc_transfer_header & hdr =
*reinterpret_cast<genode_usb_isoc_transfer_header*>(payload.addr);
size_t const header_size = sizeof(genode_usb_isoc_transfer_header) +
(hdr.number_of_packets *
sizeof(genode_usb_isoc_descriptor));
genode_buffer_t isoc_payload {
(void*) ((addr_t)payload.addr +
sizeof(genode_usb_isoc_transfer_header) +
(hdr.number_of_packets *
sizeof(genode_usb_isoc_descriptor))),
payload.size - sizeof(genode_usb_isoc_transfer_header) +
hdr.number_of_packets * sizeof(genode_usb_isoc_descriptor) };
(void *)(addr_t(payload.addr) + header_size),
payload.size - header_size };
cbs->isoc_fn(handle, cpd->index, hdr.number_of_packets,
hdr.packets, isoc_payload, opaque_data);
break;