This is a note to let you know that I've just added the patch titled
usb: dwc3: gadget: fix set_halt() bug with pending transfers
to the 3.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
usb-dwc3-gadget-fix-set_halt-bug-with-pending-transfers.patch
and it can be found in the queue-3.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From balbi@xxxxxx Wed Nov 12 08:38:02 2014
From: Felipe Balbi <balbi@xxxxxx>
Date: Mon, 10 Nov 2014 08:55:44 -0600
Subject: usb: dwc3: gadget: fix set_halt() bug with pending transfers
To: Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>, Felipe Balbi <balbi@xxxxxx>
Message-ID: <1415631344-23269-1-git-send-email-balbi@xxxxxx>
From: Felipe Balbi <balbi@xxxxxx>
[ Upstream commit 7a60855972f0d3c014093046cb6f013a1ee5bb19 ]
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@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Felipe Balbi <balbi@xxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/dwc3/ep0.c | 4 ++--
drivers/usb/dwc3/gadget.c | 16 ++++++++++++----
drivers/usb/dwc3/gadget.h | 2 +-
3 files changed, 15 insertions(+), 7 deletions(-)
--- a/drivers/usb/dwc3/ep0.c
+++ b/drivers/usb/dwc3/ep0.c
@@ -270,7 +270,7 @@ static void dwc3_ep0_stall_and_restart(s
/* 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;
@@ -480,7 +480,7 @@ static int dwc3_ep0_handle_feature(struc
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;
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -605,7 +605,7 @@ static int __dwc3_gadget_ep_disable(stru
/* 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);
@@ -1205,7 +1205,7 @@ 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;
@@ -1214,6 +1214,14 @@ int __dwc3_gadget_ep_set_halt(struct dwc
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)
@@ -1253,7 +1261,7 @@ static int dwc3_gadget_ep_set_halt(struc
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);
@@ -1273,7 +1281,7 @@ static int dwc3_gadget_ep_set_wedge(stru
if (dep->number == 0 || dep->number == 1)
return dwc3_gadget_ep0_set_halt(ep, 1);
else
- return dwc3_gadget_ep_set_halt(ep, 1);
+ return __dwc3_gadget_ep_set_halt(dep, 1, false);
}
/* -------------------------------------------------------------------------- */
--- a/drivers/usb/dwc3/gadget.h
+++ b/drivers/usb/dwc3/gadget.h
@@ -114,7 +114,7 @@ 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);
int dwc3_send_gadget_ep_cmd(struct dwc3 *dwc, unsigned ep,
unsigned cmd, struct dwc3_gadget_ep_cmd_params *params);
int dwc3_send_gadget_generic_command(struct dwc3 *dwc, int cmd, u32 param);
Patches currently in stable-queue which might be from balbi@xxxxxx are
queue-3.10/usb-dwc3-gadget-fix-set_halt-bug-with-pending-transfers.patch
queue-3.10/usb-gadget-function-acm-make-f_acm-pass-usb20cv-chapter9.patch
queue-3.10/usb-dwc3-gadget-properly-initialize-link-trb.patch
--
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