From: Thinh Nguyen Thinh.Nguyen@synopsys.com
stable inclusion from stable-v5.10.114 commit bd7f84708ea02b632fac872c5d0792d20560d826 category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I5IY1V
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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commit c7428dbddcf4ea1919e1c8e15f715b94ca359268 upstream.
If the user sets the usb_request's no_interrupt, then there will be no completion event for the request. Currently the driver incorrectly uses the event status of a different request to report the status for a request with no_interrupt. The dwc3 driver needs to check the TRB status associated with the request when reporting its status.
Note: this is only applicable to missed_isoc TRB completion status, but the other status are also listed for completeness/documentation.
Fixes: 6d8a019614f3 ("usb: dwc3: gadget: check for Missed Isoc from event status") Cc: stable@vger.kernel.org Signed-off-by: Thinh Nguyen Thinh.Nguyen@synopsys.com Link: https://lore.kernel.org/r/db2c80108286cfd108adb05bad52138b78d7c3a7.165067365... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com Acked-by: Xie XiuQi xiexiuqi@huawei.com --- drivers/usb/dwc3/gadget.c | 31 ++++++++++++++++++++++++++++++- 1 file changed, 30 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c index b68fe48ac579..1f0503dc96ee 100644 --- a/drivers/usb/dwc3/gadget.c +++ b/drivers/usb/dwc3/gadget.c @@ -2859,6 +2859,7 @@ static int dwc3_gadget_ep_cleanup_completed_request(struct dwc3_ep *dep, const struct dwc3_event_depevt *event, struct dwc3_request *req, int status) { + int request_status; int ret;
if (req->request.num_mapped_sgs) @@ -2879,7 +2880,35 @@ static int dwc3_gadget_ep_cleanup_completed_request(struct dwc3_ep *dep, req->needs_extra_trb = false; }
- dwc3_gadget_giveback(dep, req, status); + /* + * The event status only reflects the status of the TRB with IOC set. + * For the requests that don't set interrupt on completion, the driver + * needs to check and return the status of the completed TRBs associated + * with the request. Use the status of the last TRB of the request. + */ + if (req->request.no_interrupt) { + struct dwc3_trb *trb; + + trb = dwc3_ep_prev_trb(dep, dep->trb_dequeue); + switch (DWC3_TRB_SIZE_TRBSTS(trb->size)) { + case DWC3_TRBSTS_MISSED_ISOC: + /* Isoc endpoint only */ + request_status = -EXDEV; + break; + case DWC3_TRB_STS_XFER_IN_PROG: + /* Applicable when End Transfer with ForceRM=0 */ + case DWC3_TRBSTS_SETUP_PENDING: + /* Control endpoint only */ + case DWC3_TRBSTS_OK: + default: + request_status = 0; + break; + } + } else { + request_status = status; + } + + dwc3_gadget_giveback(dep, req, request_status);
out: return ret;