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usb_host: Add check to prevent submitting already inflight transfers

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This commit adds a simple flag/check in the USB Host Library that prevents
users from submitting a transfer that is already inflight.

- A transfer is considered inflight as soon as it is submitted by calling
usb_host_transfer_submit() or usb_host_transfer_submit_control()
- An inflight transfer remains inflight up until right before its callback
is called by one of the USB Host Library handler functions.

Closes https://github.com/espressif/esp-idf/issues/8748
This commit is contained in:
Darian Leung 2022-10-20 00:04:53 +08:00
parent 27078ac34c
commit e17e066828
2 changed files with 24 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
components/usb/private_include/usb_private.h
View File

@ -38,12 +38,13 @@ _Static_assert(sizeof(usb_transfer_dummy_t) == sizeof(usb_transfer_t), "usb_tran
struct urb_s{
TAILQ_ENTRY(urb_s) tailq_entry;
//HCD handler pointer and variables. Must be initialized to NULL and 0 respectively
//HCD Layer: Handler pointer and variables. Must be initialized to NULL and 0 respectively
void *hcd_ptr;
uint32_t hcd_var;
//Host Driver layer handler
//Host Lib Layer:
void *usb_host_client; //Currently only used when submitted to shared pipes (i.e., Device default pipes)
size_t usb_host_header_size; //USB Host may need the data buffer to have a transparent header
bool usb_host_inflight; //Debugging variable, used to prevent re-submitting URBs already inflight
//Public transfer structure. Must be last due to variable length array
usb_transfer_t transfer;
};

23
components/usb/usb_host.c
View File

@ -591,6 +591,8 @@ static void _handle_pending_ep(client_t *client_obj)
//Dequeue all URBs and run their transfer callback
urb_t *urb = hcd_urb_dequeue(ep_obj->constant.pipe_hdl);
while (urb != NULL) {
//Clear the transfer's inflight flag to indicate the transfer is no longer inflight
urb->usb_host_inflight = false;
urb->transfer.callback(&urb->transfer);
num_urb_dequeued++;
urb = hcd_urb_dequeue(ep_obj->constant.pipe_hdl);
@ -748,6 +750,8 @@ esp_err_t usb_host_client_handle_events(usb_host_client_handle_t client_hdl, Tic
TAILQ_REMOVE(&client_obj->dynamic.done_ctrl_xfer_tailq, urb, tailq_entry);
client_obj->dynamic.num_done_ctrl_xfer--;
HOST_EXIT_CRITICAL();
//Clear the transfer's inflight flag to indicate the transfer is no longer inflight
urb->usb_host_inflight = false;
//Call the transfer's callback
urb->transfer.callback(&urb->transfer);
HOST_ENTER_CRITICAL();
@ -1298,6 +1302,9 @@ esp_err_t usb_host_transfer_submit(usb_transfer_t *transfer)
USB_EP_DESC_GET_XFERTYPE(ep_obj->constant.ep_desc),
USB_EP_DESC_GET_MPS(ep_obj->constant.ep_desc),
transfer->bEndpointAddress & USB_B_ENDPOINT_ADDRESS_EP_DIR_MASK), ESP_ERR_INVALID_ARG);
//Check that we are not submitting a transfer already inflight
HOST_CHECK(!urb_obj->usb_host_inflight, ESP_ERR_NOT_FINISHED);
urb_obj->usb_host_inflight = true;
HOST_ENTER_CRITICAL();
ep_obj->dynamic.num_urb_inflight++;
HOST_EXIT_CRITICAL();
@ -1317,6 +1324,7 @@ hcd_err:
HOST_ENTER_CRITICAL();
ep_obj->dynamic.num_urb_inflight--;
HOST_EXIT_CRITICAL();
urb_obj->usb_host_inflight = false;
err:
return ret;
}
@ -1324,6 +1332,7 @@ err:
esp_err_t usb_host_transfer_submit_control(usb_host_client_handle_t client_hdl, usb_transfer_t *transfer)
{
HOST_CHECK(client_hdl != NULL && transfer != NULL, ESP_ERR_INVALID_ARG);
//Check that control transfer is valid
HOST_CHECK(transfer->device_handle != NULL, ESP_ERR_INVALID_ARG); //Target device must be set
usb_device_handle_t dev_hdl = transfer->device_handle;
@ -1333,8 +1342,18 @@ esp_err_t usb_host_transfer_submit_control(usb_host_client_handle_t client_hdl,
HOST_CHECK(transfer_check(transfer, USB_TRANSFER_TYPE_CTRL, dev_info.bMaxPacketSize0, xfer_is_in), ESP_ERR_INVALID_ARG);
//Control transfers must be targeted at EP 0
HOST_CHECK((transfer->bEndpointAddress & USB_B_ENDPOINT_ADDRESS_EP_NUM_MASK) == 0, ESP_ERR_INVALID_ARG);
//Save client handle into URB
urb_t *urb_obj = __containerof(transfer, urb_t, transfer);
//Check that we are not submitting a transfer already inflight
HOST_CHECK(!urb_obj->usb_host_inflight, ESP_ERR_NOT_FINISHED);
urb_obj->usb_host_inflight = true;
//Save client handle into URB
urb_obj->usb_host_client = (void *)client_hdl;
return usbh_dev_submit_ctrl_urb(dev_hdl, urb_obj);
esp_err_t ret;
ret = usbh_dev_submit_ctrl_urb(dev_hdl, urb_obj);
if (ret != ESP_OK) {
urb_obj->usb_host_inflight = false;
}
return ret;
}