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 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 <[EMAIL PROTECTED]>
---
 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 cb47337..37c8575 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);
 
-- 
1.5.6.3
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