Patchwork [6/6] USB: fsl_qe_udc: Fix stalled TX requests bug

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Submitter Anton Vorontsov
Date Dec. 25, 2008, 2:15 p.m.
Message ID <20081225141514.GF6786@oksana.dev.rtsoft.ru>
Download mbox | patch
Permalink /patch/15593/
State Accepted
Delegated to: Kumar Gala
Headers show

Comments

Anton Vorontsov - Dec. 25, 2008, 2:15 p.m.
While disabling an endpoint the driver nuking any pending requests,
thus completing them with -ESHUTDOWN status. But the driver doesn't
clear the tx_req, which means that a next TX request (after
ep_enable), might get stalled, since the driver won't queue the new
reqests.

This patch fixes a bug I'm observing with ethernet gadget while
playing with ifconfig usb0 up/down (the up/down sequence disables
and enables `in' and `out' endpoints).

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(-)

Patch

diff --git a/drivers/usb/gadget/fsl_qe_udc.c b/drivers/usb/gadget/fsl_qe_udc.c
index ea42088..69ccbeb 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;
+	ep->tx_req = NULL;
 	qe_ep_reset(udc, ep->epnum);
 	spin_unlock_irqrestore(&udc->lock, flags);