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Date: Tue, 4 Oct 2016 16:42:25 +0800
From: Baolin Wang <baolin.wang@...aro.org>
To: balbi@...nel.org
Cc: gregkh@...uxfoundation.org, broonie@...nel.org,
linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
baolin.wang@...aro.org
Subject: [RESEND PATCH v3 1/2] usb: dwc3: gadget: Add disconnect checking when changing function dynamically
When system has stpped the gadget, we should avoid queuing any requests
which will cause tranfer failed. Thus adding some disconnect checking to
avoid this situation.
Signed-off-by: Baolin Wang <baolin.wang@...aro.org>
---
Changes since v2:
- Move disconnect checking into dwc3_send_gadget_ep_cmd().
- Rename completion name and issue complete() at one place.
- Move completion initialization into dwc3_gadget_init().
Changes since v1:
- Split into 2 separate ptaches.
- Choose complete mechanism instead of polling.
---
drivers/usb/dwc3/gadget.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 1783406..ca2ae5b 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -241,6 +241,9 @@ int dwc3_send_gadget_ep_cmd(struct dwc3_ep *dep, unsigned cmd,
int susphy = false;
int ret = -EINVAL;
+ if (!dwc->pullups_connected)
+ return -ESHUTDOWN;
+
/*
* Synopsys Databook 2.60a states, on section 6.3.2.5.[1-8], that if
* we're issuing an endpoint command, we must check if
--
1.7.9.5
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