Subject: [PATCH 5/6] USB: fsl_qe_udc: Fix muram corruption by disabled endpoints

From: Anton Vorontsov <[email-masked]>
Date: Thu, 25 Dec 2008 17:15:11 +0300

Before freeing an endpoint's muram memory, we should stop all activity
of the endpoint, otherwise the QE UDC controller might do nasty things
with the muram memory that isn't belong to that endpoint anymore.

The qe_ep_reset() effectively flushes the hardware fifos, finishes all
late transaction and thus prevents the corruption.

Signed-off-by: Anton Vorontsov <[email-masked]>
Acked-by: David Brownell <[email-masked]>
---
 drivers/usb/gadget/fsl_qe_udc.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/drivers/usb/gadget/fsl_qe_udc.c b/drivers/usb/gadget/fsl_qe_udc.c
index 4726582..ea42088 100644
--- a/drivers/usb/gadget/fsl_qe_udc.c
+++ b/drivers/usb/gadget/fsl_qe_udc.c
@@ -1622,6 +1622,7 @@ static int qe_ep_disable(struct usb_ep *_ep)
 	nuke(ep, -ESHUTDOWN);
 	ep->desc = NULL;
 	ep->stopped = 1;
+	qe_ep_reset(udc, ep->epnum);
 	spin_unlock_irqrestore(&udc->lock, flags);
 
 	cpm_muram_free(cpm_muram_offset(ep->rxbase));
-- 
1.5.6.5