This is a note to let you know that I've just added the patch titled
usb: dwc3: ep0: Reset TRB counter for ep0 IN
to the 4.15-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-ep0-reset-trb-counter-for-ep0-in.patch
and it can be found in the queue-4.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From f035d139ffece7b6a7b8bfb17bd0ba715ee57a04 Mon Sep 17 00:00:00 2001
From: Thinh Nguyen <Thinh.Nguyen@xxxxxxxxxxxx>
Date: Fri, 12 Jan 2018 18:18:27 -0800
Subject: usb: dwc3: ep0: Reset TRB counter for ep0 IN
From: Thinh Nguyen <Thinh.Nguyen@xxxxxxxxxxxx>
commit f035d139ffece7b6a7b8bfb17bd0ba715ee57a04 upstream.
DWC3 tracks TRB counter for each ep0 direction separately. In control
read transfer completion handler, the driver needs to reset the TRB
enqueue counter for ep0 IN direction. Currently the driver only resets
the TRB counter for control OUT endpoint. Check for the data direction
and properly reset the TRB counter from correct control endpoint.
Cc: stable@xxxxxxxxxxxxxxx
Fixes: c2da2ff00606 ("usb: dwc3: ep0: don't use ep0in for transfers")
Signed-off-by: Thinh Nguyen <thinhn@xxxxxxxxxxxx>
Signed-off-by: Felipe Balbi <felipe.balbi@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/dwc3/ep0.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
--- a/drivers/usb/dwc3/ep0.c
+++ b/drivers/usb/dwc3/ep0.c
@@ -858,7 +858,12 @@ static void dwc3_ep0_complete_data(struc
trb++;
trb->ctrl &= ~DWC3_TRB_CTRL_HWO;
trace_dwc3_complete_trb(ep0, trb);
- ep0->trb_enqueue = 0;
+
+ if (r->direction)
+ dwc->eps[1]->trb_enqueue = 0;
+ else
+ dwc->eps[0]->trb_enqueue = 0;
+
dwc->ep0_bounced = false;
}
Patches currently in stable-queue which might be from Thinh.Nguyen@xxxxxxxxxxxx are
queue-4.15/usb-dwc3-ep0-reset-trb-counter-for-ep0-in.patch
queue-4.15/usb-dwc3-gadget-set-maxpacket-size-for-ep0-in.patch