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DM USB: xHCI: fix issue of discarding zero sized BULK transfer

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Should not disacard zero-size bulk transfer.

Tracked-On: #2800
Signed-off-by: Xiaoguang Wu <xiaoguang.wu@intel.com>
Acked-by: Yu Wang <yu1.wang@intel.com>
This commit is contained in:
Xiaoguang Wu 2019-03-14 22:40:43 +08:00 committed by wenlingz
parent 2ada1d4dbf
commit c6efc67c20
1 changed files with 15 additions and 7 deletions
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22
devicemodel/hw/platform/usb_pmapper.c
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@ -263,7 +263,7 @@ usb_dev_comp_req(struct libusb_transfer *libusb_xfer)
block = &xfer->data[idx % USB_MAX_XFER_BLOCKS];
/* Link TRB need to be skipped */
if (!block->buf || !block->blen) {
if (!block->buf) {
/* FIXME: should change hard coded USB_MAX_XFER_BLOCKS
* to dynamically mechanism to avoid dead loop.
*/
@ -353,9 +353,16 @@ usb_dev_alloc_req(struct usb_dev *udev, struct usb_data_xfer *xfer, int in,
if (!req->libusb_xfer)
goto errout;
if (size)
req->buffer = malloc(size);
/* According to C99: 'If size is 0, then malloc() returns either NULL,
* or a unique pointer value that can later be successfully passed to
* free().' So at this place, the size is set to 1 to avoid potential
* risk.
*/
if (size == 0)
size = 1;
req->buffer = malloc(size);
if (!req->buffer)
goto errout;
@ -393,7 +400,8 @@ usb_dev_prepare_xfer(struct usb_data_xfer *xfer, int *count, int *size)
idx = (idx + 1) % USB_MAX_XFER_BLOCKS;
continue;
}
if (block->buf && block->blen > 0) {
if (block->buf) {
if (!found) {
found = 1;
first = idx;
@ -765,6 +773,9 @@ usb_dev_data(void *pdata, struct usb_data_xfer *xfer, int dir, int epctx)
xfer->status = USB_ERR_NORMAL_COMPLETION;
blk_start = usb_dev_prepare_xfer(xfer, &blk_count, &data_size);
if (blk_count <= 0)
goto done;
if (blk_start < 0)
goto done;
@ -777,9 +788,6 @@ usb_dev_data(void *pdata, struct usb_data_xfer *xfer, int dir, int epctx)
goto done;
}
if (data_size <= 0)
goto done;
/* TODO:
* need to check performance effect of 'type == USB_ENDPOINT_ISOC'.
* With this implementation, there should be some performance loss.