usb: renesas_usbhs: missed the "running" flag in usb_dmac with rx path

commit 17aa31f13cad25daa19d3f923323f552e87bc874 upstream.

This fixes an issue that a gadget driver (usb_f_fs) is possible to
stop rx transactions after the usb-dmac is used because the following
functions missed to set/check the "running" flag.
 - usbhsf_dma_prepare_pop_with_usb_dmac()
 - usbhsf_dma_pop_done_with_usb_dmac()

So, if next transaction uses pio, the usbhsf_prepare_pop() can not
start the transaction because the "running" flag is 0.

Fixes: 8355b2b3082d ("usb: renesas_usbhs: fix the behavior of some usbhs_pkt_handle")
Cc: <stable@vger.kernel.org> # v3.19+
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/renesas_usbhs/fifo.c b/drivers/usb/renesas_usbhs/fifo.c
index 50285b01da92ee0ee9ab60507800607ca207b8be..5d369b38868a626665b7e7e423feade1136d75cc 100644 (file)
--- a/drivers/usb/renesas_usbhs/fifo.c
+++ b/drivers/usb/renesas_usbhs/fifo.c
@@ -998,6 +998,10 @@ static int usbhsf_dma_prepare_pop_with_usb_dmac(struct usbhs_pkt *pkt,
        if ((uintptr_t)pkt->buf & (USBHS_USB_DMAC_XFER_SIZE - 1))
                goto usbhsf_pio_prepare_pop;
 
+       /* return at this time if the pipe is running */
+       if (usbhs_pipe_is_running(pipe))
+               return 0;
+
        usbhs_pipe_config_change_bfre(pipe, 1);
 
        ret = usbhsf_fifo_select(pipe, fifo, 0);
@@ -1188,6 +1192,7 @@ static int usbhsf_dma_pop_done_with_usb_dmac(struct usbhs_pkt *pkt,
        usbhsf_fifo_clear(pipe, fifo);
        pkt->actual = usbhs_dma_calc_received_size(pkt, chan, rcv_len);
 
+       usbhs_pipe_running(pipe, 0);
        usbhsf_dma_stop(pipe, fifo);
        usbhsf_dma_unmap(pkt);
        usbhsf_fifo_unselect(pipe, pipe->fifo);