This is a note to let you know that I've just added the patch titled
usb: dwc3: gadget: free trb pool only from epnum 2
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-free-trb-pool-only-from-epnum-2.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 <stable@xxxxxxxxxxxxxxx> know about it.
>From 5b9ce8be3223c6d68e7581b0de59f6a92ccdd02d Mon Sep 17 00:00:00 2001
From: George Cherian <george.cherian@xxxxxx>
Date: Mon, 27 May 2013 14:35:49 +0530
Subject: usb: dwc3: gadget: free trb pool only from epnum 2
From: George Cherian <george.cherian@xxxxxx>
commit 5bf8fae33d14cc5c3c53a926f9079f92c8b082b0 upstream.
we never allocate a TRB pool for physical endpoints
0 and 1 so trying to free it (a invalid TRB pool pointer)
will lead us in a warning while removing dwc3.ko module.
In order to fix the situation, all we have to do is skip
dwc3_free_trb_pool() for physical endpoints 0 and 1 just
as we while deleting endpoints from the endpoints list.
Signed-off-by: George Cherian <george.cherian@xxxxxx>
Signed-off-by: Felipe Balbi <balbi@xxxxxx>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
Cc: Yang Yingliang <yangyingliang@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/dwc3/gadget.c | 15 ++++++++++++---
1 file changed, 12 insertions(+), 3 deletions(-)
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -1483,10 +1483,19 @@ static void dwc3_gadget_free_endpoints(s
for (epnum = 0; epnum < DWC3_ENDPOINTS_NUM; epnum++) {
dep = dwc->eps[epnum];
- dwc3_free_trb_pool(dep);
-
- if (epnum != 0 && epnum != 1)
+ /*
+ * Physical endpoints 0 and 1 are special; they form the
+ * bi-directional USB endpoint 0.
+ *
+ * For those two physical endpoints, we don't allocate a TRB
+ * pool nor do we add them the endpoints list. Due to that, we
+ * shouldn't do these two operations otherwise we would end up
+ * with all sorts of bugs when removing dwc3.ko.
+ */
+ if (epnum != 0 && epnum != 1) {
+ dwc3_free_trb_pool(dep);
list_del(&dep->endpoint.ep_list);
+ }
kfree(dep);
}
Patches currently in stable-queue which might be from george.cherian@xxxxxx are
queue-3.4/usb-dwc3-gadget-free-trb-pool-only-from-epnum-2.patch
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