From: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
To: Felipe Balbi <balbi@kernel.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Thinh Nguyen <Thinh.Nguyen@synopsys.com>,
linux-usb@vger.kernel.org
Cc: John Youn <John.Youn@synopsys.com>
Subject: [PATCH v2 1/4] usb: dwc3: gadget: Properly handle failed kick_transfer
Date: Sun, 29 Mar 2020 16:12:57 -0700 [thread overview]
Message-ID: <e20a7c12313427787fc22f0a4318ee632245d041.1585523081.git.thinhn@synopsys.com> (raw)
In-Reply-To: <cover.1585523081.git.thinhn@synopsys.com>
If dwc3 fails to issue START_TRANSFER/UPDATE_TRANSFER command, then we
should properly end an active transfer and give back all the started
requests. However if it's for an isoc endpoint, the failure maybe due to
bus-expiry status. In this case, don't give back the requests and wait
for the next retry.
Fixes: 72246da40f37 ("usb: Introduce DesignWare USB3 DRD Driver")
Signed-off-by: Thinh Nguyen <thinhn@synopsys.com>
---
drivers/usb/dwc3/gadget.c | 24 ++++++++++++++++--------
1 file changed, 16 insertions(+), 8 deletions(-)
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 6d2b3de455cc..b02832ad9e72 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -1220,6 +1220,8 @@ static void dwc3_prepare_trbs(struct dwc3_ep *dep)
}
}
+static void dwc3_gadget_ep_cleanup_cancelled_requests(struct dwc3_ep *dep);
+
static int __dwc3_gadget_kick_transfer(struct dwc3_ep *dep)
{
struct dwc3_gadget_ep_cmd_params params;
@@ -1259,14 +1261,20 @@ static int __dwc3_gadget_kick_transfer(struct dwc3_ep *dep)
ret = dwc3_send_gadget_ep_cmd(dep, cmd, ¶ms);
if (ret < 0) {
- /*
- * FIXME we need to iterate over the list of requests
- * here and stop, unmap, free and del each of the linked
- * requests instead of what we do now.
- */
- if (req->trb)
- memset(req->trb, 0, sizeof(struct dwc3_trb));
- dwc3_gadget_del_and_unmap_request(dep, req, ret);
+ struct dwc3_request *tmp;
+
+ if (ret == -EAGAIN)
+ return ret;
+
+ dwc3_stop_active_transfer(dep, true, true);
+
+ list_for_each_entry_safe(req, tmp, &dep->started_list, list)
+ dwc3_gadget_move_cancelled_request(req);
+
+ /* If ep isn't started, then there's no end transfer pending */
+ if (!(dep->flags & DWC3_EP_END_TRANSFER_PENDING))
+ dwc3_gadget_ep_cleanup_cancelled_requests(dep);
+
return ret;
}
--
2.11.0
next prev parent reply other threads:[~2020-03-29 23:13 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-29 23:12 [PATCH v2 0/4] usb: dwc3: gadget: Improve isoc starting mechanism Thinh Nguyen
2020-03-29 23:12 ` Thinh Nguyen [this message]
2020-03-29 23:13 ` [PATCH v2 2/4] usb: dwc3: gadget: Store resource index of start cmd Thinh Nguyen
2020-03-29 23:13 ` [PATCH v2 3/4] usb: dwc3: gadget: Issue END_TRANSFER to retry isoc transfer Thinh Nguyen
2020-03-29 23:13 ` [PATCH v2 4/4] usb: dwc3: gadget: WARN on no-resource status Thinh Nguyen
2020-03-30 8:15 ` [PATCH v2 0/4] usb: dwc3: gadget: Improve isoc starting mechanism Felipe Balbi
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