This is a note to let you know that I've just added the patch titled
usb: dwc3: gadget: fix 'endpoint always busy' bug
to the 3.4-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-endpoint-always-busy-bug.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 041d81f493d90c940ec41f0ec98bc7c4f2fba431 Mon Sep 17 00:00:00 2001
From: Felipe Balbi <[email protected]>
Date: Thu, 4 Oct 2012 11:58:00 +0300
Subject: usb: dwc3: gadget: fix 'endpoint always busy' bug
From: Felipe Balbi <[email protected]>
commit 041d81f493d90c940ec41f0ec98bc7c4f2fba431 upstream.
If a USB transfer has already been started, meaning
we have already issued StartTransfer command to that
particular endpoint, DWC3_EP_BUSY flag has also
already been set.
When we try to cancel this transfer which is already
in controller's cache, we will not receive XferComplete
event and we must clear DWC3_EP_BUSY in order to allow
subsequent requests to be properly started.
The best place to clear that flag is right after issuing
DWC3_DEPCMD_ENDTRANSFER.
Reported-by: Moiz Sonasath <[email protected]>
Signed-off-by: Felipe Balbi <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/usb/dwc3/gadget.c | 1 +
1 file changed, 1 insertion(+)
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -1777,6 +1777,7 @@ static void dwc3_stop_active_transfer(st
ret = dwc3_send_gadget_ep_cmd(dwc, dep->number, cmd, ¶ms);
WARN_ON_ONCE(ret);
dep->res_trans_idx = 0;
+ dep->flags &= ~DWC3_EP_BUSY;
}
}
Patches currently in stable-queue which might be from [email protected] are
queue-3.4/usb-dwc3-gadget-fix-endpoint-always-busy-bug.patch
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