This is a note to let you know that I've just added the patch titled
usb: dwc3: ep0: correct cache sync issue in case of ep0_bounced
to the 3.5-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-correct-cache-sync-issue-in-case-of-ep0_bounced.patch
and it can be found in the queue-3.5 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 0416e494ce7dc84e2719bc9fb7daecb330476074 Mon Sep 17 00:00:00 2001
From: Pratyush Anand <[email protected]>
Date: Fri, 10 Aug 2012 13:42:16 +0530
Subject: usb: dwc3: ep0: correct cache sync issue in case of ep0_bounced
From: Pratyush Anand <[email protected]>
commit 0416e494ce7dc84e2719bc9fb7daecb330476074 upstream.
In case of ep0 out, if length is not aligned to maxpacket size then we use
dwc->ep_bounce_addr for dma transfer and not request->dma. Since, we have
alreday done memcpy from dwc->ep0_bounce to request->buf, so we do not need to
issue cache sync function. In fact, cache sync function will bring wrong data
in request->buf from request->dma in this scenario.
So, cache sync function must not be executed in case of ep0 bounced.
Signed-off-by: Pratyush Anand <[email protected]>
Signed-off-by: Felipe Balbi <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/usb/dwc3/ep0.c | 1 -
drivers/usb/dwc3/gadget.c | 7 +++++--
2 files changed, 5 insertions(+), 3 deletions(-)
--- a/drivers/usb/dwc3/ep0.c
+++ b/drivers/usb/dwc3/ep0.c
@@ -702,7 +702,6 @@ static void dwc3_ep0_complete_data(struc
transferred = min_t(u32, ur->length,
transfer_size - length);
memcpy(ur->buf, dwc->ep0_bounce, transferred);
- dwc->ep0_bounced = false;
} else {
transferred = ur->length - length;
}
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -238,8 +238,11 @@ void dwc3_gadget_giveback(struct dwc3_ep
if (req->request.status == -EINPROGRESS)
req->request.status = status;
- usb_gadget_unmap_request(&dwc->gadget, &req->request,
- req->direction);
+ if (dwc->ep0_bounced && dep->number == 0)
+ dwc->ep0_bounced = false;
+ else
+ usb_gadget_unmap_request(&dwc->gadget, &req->request,
+ req->direction);
dev_dbg(dwc->dev, "request %p from %s completed %d/%d ===> %d\n",
req, dep->name, req->request.actual,
Patches currently in stable-queue which might be from [email protected] are
queue-3.5/usb-dwc3-ep0-correct-cache-sync-issue-in-case-of-ep0_bounced.patch
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