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usb: dwc3: gadget: cope with XferNotReady before usb_ep_queue() 

If XferNotReady comes before usb_ep_queue() we will
set our PENDING request flag and wait for a
request. However, originally, we were assuming
usb_ep_queue() would always happen before our first
XferNotReady and that causes a corner case where we
could try to issue ENDTRANSFER command before
STARTTRANSFER.

Let's fix that by tracking endpoints which have been
started.

Reported-by: Janusz Dziedzic <januszx.dziedzic@intel.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
This commit is contained in:
Felipe Balbi 2016-10-21 13:07:09 +03:00
parent 76a638f8ac
commit 6cb2e4e3de
2 changed files with 34 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/usb/dwc3/core.h
View File

@ -551,6 +551,7 @@ struct dwc3_ep {
#define DWC3_EP_PENDING_REQUEST (1 << 5)
#define DWC3_EP_MISSED_ISOC (1 << 6)
#define DWC3_EP_END_TRANSFER_PENDING (1 << 7)
#define DWC3_EP_TRANSFER_STARTED (1 << 8)
/* This last one is specific to EP0 */
#define DWC3_EP0_DIR_IN (1 << 31)

40
drivers/usb/dwc3/gadget.c
View File

@ -340,6 +340,20 @@ int dwc3_send_gadget_ep_cmd(struct dwc3_ep *dep, unsigned cmd,
trace_dwc3_gadget_ep_cmd(dep, cmd, params, cmd_status);
if (ret == 0) {
switch (DWC3_DEPCMD_CMD(cmd)) {
case DWC3_DEPCMD_STARTTRANSFER:
dep->flags |= DWC3_EP_TRANSFER_STARTED;
break;
case DWC3_DEPCMD_ENDTRANSFER:
dep->flags &= ~DWC3_EP_TRANSFER_STARTED;
break;
default:
/* nothing */
break;
}
}
if (unlikely(susphy)) {
reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0));
reg |= DWC3_GUSB2PHYCFG_SUSPHY;
@ -1066,6 +1080,14 @@ static int __dwc3_gadget_kick_transfer(struct dwc3_ep *dep, u16 cmd_param)
return 0;
}
static int __dwc3_gadget_get_frame(struct dwc3 *dwc)
{
u32 reg;
reg = dwc3_readl(dwc->regs, DWC3_DSTS);
return DWC3_DSTS_SOFFN(reg);
}
static void __dwc3_gadget_start_isoc(struct dwc3 *dwc,
struct dwc3_ep *dep, u32 cur_uf)
{
@ -1143,10 +1165,16 @@ static int __dwc3_gadget_ep_queue(struct dwc3_ep *dep, struct dwc3_request *req)
* errors which will force us issue EndTransfer command.
*/
if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
if ((dep->flags & DWC3_EP_PENDING_REQUEST) &&
list_empty(&dep->started_list)) {
dwc3_stop_active_transfer(dwc, dep->number, true);
dep->flags = DWC3_EP_ENABLED;
if ((dep->flags & DWC3_EP_PENDING_REQUEST)) {
if (dep->flags & DWC3_EP_TRANSFER_STARTED) {
dwc3_stop_active_transfer(dwc, dep->number, true);
dep->flags = DWC3_EP_ENABLED;
} else {
u32 cur_uf;
cur_uf = __dwc3_gadget_get_frame(dwc);
__dwc3_gadget_start_isoc(dwc, dep, cur_uf);
}
}
return 0;
}
@ -1392,10 +1420,8 @@ static const struct usb_ep_ops dwc3_gadget_ep_ops = {
static int dwc3_gadget_get_frame(struct usb_gadget *g)
{
struct dwc3 *dwc = gadget_to_dwc(g);
u32 reg;
reg = dwc3_readl(dwc->regs, DWC3_DSTS);
return DWC3_DSTS_SOFFN(reg);
return __dwc3_gadget_get_frame(dwc);
}
static int __dwc3_gadget_wakeup(struct dwc3 *dwc)