3.3-stable review patch. If anyone has any objections, please let me know.
------------------ From: Paul Zimmerman <[email protected]> commit 8d62cd65d74d0e241b3a152f7347bb66126b705b upstream. If we have a non-ISOC endpoint, we will not have a Link TRB pointing to the beginning of the TRB pool. On such endpoints, we don't want to let the driver wrap around the TRB pool otherwise controller will hang waiting for a valid TRB. Signed-off-by: Paul Zimmerman <[email protected]> Signed-off-by: Felipe Balbi <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- drivers/usb/dwc3/gadget.c | 8 ++++++++ 1 file changed, 8 insertions(+) --- a/drivers/usb/dwc3/gadget.c +++ b/drivers/usb/dwc3/gadget.c @@ -667,6 +667,7 @@ static void dwc3_prepare_trbs(struct dwc { struct dwc3_request *req, *n; u32 trbs_left; + u32 max; unsigned int last_one = 0; BUILD_BUG_ON_NOT_POWER_OF_2(DWC3_TRB_NUM); @@ -674,6 +675,13 @@ static void dwc3_prepare_trbs(struct dwc /* the first request must not be queued */ trbs_left = (dep->busy_slot - dep->free_slot) & DWC3_TRB_MASK; + /* Can't wrap around on a non-isoc EP since there's no link TRB */ + if (!usb_endpoint_xfer_isoc(dep->desc)) { + max = DWC3_TRB_NUM - (dep->free_slot & DWC3_TRB_MASK); + if (trbs_left > max) + trbs_left = max; + } + /* * if busy & slot are equal than it is either full or empty. If we are * starting to proceed requests then we are empty. Otherwise we ar -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
