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

Message ID 20081225141511.GE6786@oksana.dev.rtsoft.ru (mailing list archive)
State Accepted, archived
Delegated to: Kumar Gala
Headers show

Commit Message

Anton Vorontsov Dec. 25, 2008, 2:15 p.m. UTC 
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 <avorontsov@ru.mvista.com>
Acked-by: David Brownell <dbrownell@users.sourceforge.net>
---
 drivers/usb/gadget/fsl_qe_udc.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
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Patch

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));