usb: chipidea: udc: free pending TD at removal procedure

There is a pending TD which is not freed after request finishes,
we do this due to a controller bug. This TD needs to be freed when
the driver is removed. It prints below error message when unload
chipidea driver at current code:
"ci_hdrc ci_hdrc.0: dma_pool_destroy ci_hw_td, b0001000 busy"
It indicates the buffer at dma pool are still in use.

This commit will free the pending TD at driver's removal procedure,
it can fix the problem described above.

Acked-by: Michael Grzeschik <m.grzeschik@pengutronix.de>
Signed-off-by: Peter Chen <peter.chen@freescale.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/chipidea/udc.c b/drivers/usb/chipidea/udc.c
index 5280454fb2a743000f4e6a267a5e2e15c7a07e26..9333083dd1111c047c7016a44402242e2aa87f7d 100644 (file)
--- a/drivers/usb/chipidea/udc.c
+++ b/drivers/usb/chipidea/udc.c
@@ -1600,6 +1600,8 @@ static void destroy_eps(struct ci_hdrc *ci)
        for (i = 0; i < ci->hw_ep_max; i++) {
                struct ci_hw_ep *hwep = &ci->ci_hw_ep[i];
 
+               if (hwep->pending_td)
+                       free_pending_td(hwep);
                dma_pool_free(ci->qh_pool, hwep->qh.ptr, hwep->qh.dma);
        }
 }