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ums/xusb: do not allow multiple CBW requests

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On XUSB do not allow multiple requests for CBW to be done.
This avoids an issue with some XHCI controllers and OS combos (e.g. ASMedia and Linux/Mac OS) which confuse that and concatenate an old CBW request with another write request (SCSI Write) and create a babble error (transmit overflow).
This commit is contained in:
CTCaer 2021-08-28 17:09:38 +03:00
parent 134f3dac52
commit 4b7e1f699d
1 changed files with 19 additions and 1 deletions
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18
bdk/usb/usb_gadget_ums.c
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@ -217,6 +217,7 @@ typedef struct _usbd_gadget_ums_t {
u32 tag;
u32 residue;
u32 usb_amount_left;
bool cbw_req_queued;
u32 phase_error;
u32 short_packet_received;
@ -1578,6 +1579,8 @@ static int received_cbw(usbd_gadget_ums_t *ums, bulk_ctxt_t *bulk_ctxt)
{
ums->set_text(ums->label, "#C7EA46 Status:# Medium unmounted");
ums->timeouts++;
if (!bulk_ctxt->bulk_out_status)
ums->timeouts += 3;
}
if (ums->timeouts > 20)
@ -1588,6 +1591,9 @@ static int received_cbw(usbd_gadget_ums_t *ums, bulk_ctxt_t *bulk_ctxt)
return UMS_RES_INVALID_ARG;
}
// Clear request flag to allow a new one to be queued.
ums->cbw_req_queued = false;
// Is the CBW valid?
bulk_recv_pkt_t *cbw = (bulk_recv_pkt_t *)bulk_ctxt->bulk_out_buf;
if (bulk_ctxt->bulk_out_length_actual != USB_BULK_CB_WRAP_LEN || cbw->Signature != USB_BULK_CB_SIG)
@ -1665,7 +1671,19 @@ static int get_next_command(usbd_gadget_ums_t *ums, bulk_ctxt_t *bulk_ctxt)
bulk_ctxt->bulk_out_length = USB_BULK_CB_WRAP_LEN;
// Queue a request to read a Bulk-only CBW.
if (!ums->cbw_req_queued)
_ums_transfer_start(ums, bulk_ctxt, bulk_ctxt->bulk_out, USB_XFER_SYNCED_CMD);
else
_ums_transfer_finish(ums, bulk_ctxt, bulk_ctxt->bulk_out, USB_XFER_SYNCED_CMD);
/*
* On XUSB do not allow multiple requests for CBW to be done.
* This avoids an issue with some XHCI controllers and OS combos (e.g. ASMedia and Linux/Mac OS)
* which confuse that and concatenate an old CBW request with another write request (SCSI Write)
* and create a babble error (transmit overflow).
*/
if (ums->xusb)
ums->cbw_req_queued = true;
/* We will drain the buffer in software, which means we
* can reuse it for the next filling. No need to advance