@@ -251,7 +251,7 @@ static void dwc3_ep0_stall_and_restart(struct dwc3 *dwc)
/* stall is always issued on EP0 */
dep = dwc->eps[0];
- __dwc3_gadget_ep_set_halt(dep, 1);
+ __dwc3_gadget_ep_set_halt(dep, 1, false);
dep->flags = DWC3_EP_ENABLED;
dwc->delayed_status = false;
@@ -461,7 +461,7 @@ static int dwc3_ep0_handle_feature(struct dwc3 *dwc,
return -EINVAL;
if (set == 0 && (dep->flags & DWC3_EP_WEDGE))
break;
- ret = __dwc3_gadget_ep_set_halt(dep, set);
+ ret = __dwc3_gadget_ep_set_halt(dep, set, true);
if (ret)
return -EINVAL;
break;
@@ -588,7 +588,7 @@ static int __dwc3_gadget_ep_disable(struct dwc3_ep *dep)
/* make sure HW endpoint isn't stalled */
if (dep->flags & DWC3_EP_STALL)
- __dwc3_gadget_ep_set_halt(dep, 0);
+ __dwc3_gadget_ep_set_halt(dep, 0, false);
reg = dwc3_readl(dwc->regs, DWC3_DALEPENA);
reg &= ~DWC3_DALEPENA_EP(dep->number);
@@ -1186,7 +1186,7 @@ out0:
return ret;
}
-int __dwc3_gadget_ep_set_halt(struct dwc3_ep *dep, int value)
+int __dwc3_gadget_ep_set_halt(struct dwc3_ep *dep, int value, int protocol)
{
struct dwc3_gadget_ep_cmd_params params;
struct dwc3 *dwc = dep->dwc;
@@ -1195,6 +1195,14 @@ int __dwc3_gadget_ep_set_halt(struct dwc3_ep *dep, int value)
memset(¶ms, 0x00, sizeof(params));
if (value) {
+ if (!protocol && ((dep->direction && dep->flags & DWC3_EP_BUSY) ||
+ (!list_empty(&dep->req_queued) ||
+ !list_empty(&dep->request_list)))) {
+ dev_dbg(dwc->dev, "%s: pending request, cannot halt\n",
+ dep->name);
+ return -EAGAIN;
+ }
+
ret = dwc3_send_gadget_ep_cmd(dwc, dep->number,
DWC3_DEPCMD_SETSTALL, ¶ms);
if (ret)
@@ -1234,7 +1242,7 @@ static int dwc3_gadget_ep_set_halt(struct usb_ep *ep, int value)
goto out;
}
- ret = __dwc3_gadget_ep_set_halt(dep, value);
+ ret = __dwc3_gadget_ep_set_halt(dep, value, false);
out:
spin_unlock_irqrestore(&dwc->lock, flags);
@@ -85,7 +85,7 @@ void dwc3_ep0_out_start(struct dwc3 *dwc);
int dwc3_gadget_ep0_set_halt(struct usb_ep *ep, int value);
int dwc3_gadget_ep0_queue(struct usb_ep *ep, struct usb_request *request,
gfp_t gfp_flags);
-int __dwc3_gadget_ep_set_halt(struct dwc3_ep *dep, int value);
+int __dwc3_gadget_ep_set_halt(struct dwc3_ep *dep, int value, int protocol);
/**
* dwc3_gadget_ep_get_transfer_index - Gets transfer index from HW
This is a note to let you know that I have just added a patch titled usb: dwc3: gadget: fix set_halt() bug with pending transfers to the linux-3.13.y-queue branch of the 3.13.y.z extended stable tree which can be found at: http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.13.y-queue This patch is scheduled to be released in version 3.13.11.11. If you, or anyone else, feels it should not be added to this tree, please reply to this email. For more information about the 3.13.y.z tree, see https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable Thanks. -Kamal ------ From 2d0d499aa745f19918aebe45f442c62cc4d022f8 Mon Sep 17 00:00:00 2001 From: Felipe Balbi <balbi@ti.com> Date: Wed, 24 Sep 2014 14:19:52 -0500 Subject: usb: dwc3: gadget: fix set_halt() bug with pending transfers commit 7a60855972f0d3c014093046cb6f013a1ee5bb19 upstream. According to our Gadget Framework API documentation, ->set_halt() *must* return -EAGAIN if we have pending transfers (on either direction) or FIFO isn't empty (on TX endpoints). Fix this bug so that the mass storage gadget can be used without stall=0 parameter. This patch should be backported to all kernels since v3.2. Suggested-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Felipe Balbi <balbi@ti.com> [ kamal: backport to 3.13-stable: omitted ep_set_wedge() change ] Signed-off-by: Kamal Mostafa <kamal@canonical.com> --- drivers/usb/dwc3/ep0.c | 4 ++-- drivers/usb/dwc3/gadget.c | 14 +++++++++++--- drivers/usb/dwc3/gadget.h | 2 +- 3 files changed, 14 insertions(+), 6 deletions(-) -- 1.9.1