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usb: dwc3: gadget: fix set_halt() bug with pending transfers

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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.

Cc: <stable@vger.kernel.org> # v3.2+
Suggested-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Felipe Balbi
2014-09-24 14:19:52 -05:00
parent 95aa4e8d65
commit 7a60855972
3 changed files with 15 additions and 7 deletions
Download Patch File Download Diff File Expand all files Collapse all files

16
drivers/usb/dwc3/gadget.c
View File

@@ -581,7 +581,7 @@ 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);
@@ -1202,7 +1202,7 @@ 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;
@@ -1216,6 +1216,14 @@ int __dwc3_gadget_ep_set_halt(struct dwc3_ep *dep, int value)
memset(&params, 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, &params);
if (ret)
@@ -1246,7 +1254,7 @@ static int dwc3_gadget_ep_set_halt(struct usb_ep *ep, int value)
int ret;
spin_lock_irqsave(&dwc->lock, flags);
ret = __dwc3_gadget_ep_set_halt(dep, value);
ret = __dwc3_gadget_ep_set_halt(dep, value, false);
spin_unlock_irqrestore(&dwc->lock, flags);
return ret;
@@ -1265,7 +1273,7 @@ static int dwc3_gadget_ep_set_wedge(struct usb_ep *ep)
if (dep->number == 0 || dep->number == 1)
ret = __dwc3_gadget_ep0_set_halt(ep, 1);
else
ret = __dwc3_gadget_ep_set_halt(dep, 1);
ret = __dwc3_gadget_ep_set_halt(dep, 1, false);
spin_unlock_irqrestore(&dwc->lock, flags);
return ret;