Patch "usb: dwc3: gadget: don't clear EP_BUSY too early" has been added to the 4.1-stable tree

This is a note to let you know that I've just added the patch titled

usb: dwc3: gadget: don't clear EP_BUSY too early

to the 4.1-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-don-t-clear-ep_busy-too-early.patch
and it can be found in the queue-4.1 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Felipe Balbi <[email protected]>
Date: Fri, 29 May 2015 10:06:38 -0500
Subject: usb: dwc3: gadget: don't clear EP_BUSY too early

From: Felipe Balbi <[email protected]>

commit e18b7975c885bc3a938b9a76daf32957ea0235fa upstream.

In case of non-Isochronous transfers, we don't want to clear DWC3_EP_BUSY flag until XferComplete event. That's because XferInProgress was only enabled so we can recycle TRBs and usb_requests quicker, but there are still other pending requests being transferred.

In order to make sure we don't allow for another StartTransfer command while the HW is still processing other transfers, we must keep DWC3_EP_BUSY flag set and this what this patch does.

bulk/interrupt transfers)

---
 drivers/usb/dwc3/gadget.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

@@ -1906,12 +1906,16 @@ static void dwc3_endpoint_transfer_compl
 {
 	unsigned		status = 0;
 	int			clean_busy;
+	u32			is_xfer_complete;
+
+	is_xfer_complete = (event->endpoint_event == DWC3_DEPEVT_XFERCOMPLETE);
 
 	if (event->status & DEPEVT_STATUS_BUSERR)
 		status = -ECONNRESET;
 
 	clean_busy = dwc3_cleanup_done_reqs(dwc, dep, event, status);
-	if (clean_busy)
+	if (clean_busy && (is_xfer_complete ||
+				usb_endpoint_xfer_isoc(dep->endpoint.desc)))
 		dep->flags &= ~DWC3_EP_BUSY;
 
 	/*

Patches currently in stable-queue which might be from [email protected] are

queue-4.1/usb-f_mass_storage-limit-number-of-reported-luns.patch queue-4.1/usb-dwc3-reset-the-transfer-resource-index-on-set_interface.patch queue-4.1/usb-musb-host-rely-on-port_mode-to-call-musb_start.patch queue-4.1/usb-gadget-mv_udc_core-fix-phy_regs-i-o-memory-leak.patch queue-4.1/usb-dwc3-gadget-don-t-clear-ep_busy-too-early.patch queue-4.1/usb-gadget-composite-fix-null-pointer-dereference.patch queue-4.1/usb-dwc3-gadget-return-error-if-command-sent-to-depcmd-register-fails.patch queue-4.1/usb-phy-mxs-suspend-to-ram-causes-null-pointer-dereference.patch queue-4.1/usb-gadget-f_fs-do-not-set-cancel-function-on-synchronous-read-write.patch queue-4.1/usb-dwc3-gadget-return-error-if-command-sent-to-dgcmd-register-fails.patch