When data read interrupt happened, the pipe is BUF which means "enable".
then, next un-necessary interrupt/token might be
issued again when all data were popped from fifo.
It will cause un-understandable bug.
This patch decides pipe disable on top of read interrupt.
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@xxxxxxxxxxx>
---
drivers/usb/renesas_usbhs/fifo.c | 23 ++++++++++++++---------
1 files changed, 14 insertions(+), 9 deletions(-)
diff --git a/drivers/usb/renesas_usbhs/fifo.c b/drivers/usb/renesas_usbhs/fifo.c
index 87f56b6..1a345c2 100644
--- a/drivers/usb/renesas_usbhs/fifo.c
+++ b/drivers/usb/renesas_usbhs/fifo.c
@@ -476,6 +476,20 @@ static int usbhsf_pio_try_pop(struct usbhs_pkt *pkt, int *is_done)
total_len = len;
/*
+ * update actual length first here to decide disable pipe.
+ * if this pipe keeps BUF status and all data were popped,
+ * then, next interrupt/token will be issued again
+ */
+ pkt->actual += total_len;
+
+ if ((pkt->actual == pkt->length) || /* receive all data */
+ (total_len < maxp)) { /* short packet */
+ *is_done = 1;
+ usbhsf_rx_irq_ctrl(pipe, 0);
+ usbhs_pipe_disable(pipe); /* disable pipe first */
+ }
+
+ /*
* Buffer clear if Zero-Length packet
*
* see
@@ -505,16 +519,7 @@ static int usbhsf_pio_try_pop(struct usbhs_pkt *pkt, int *is_done)
buf[i] = (data >> ((i & 0x03) * 8)) & 0xff;
}
- pkt->actual += total_len;
-
usbhs_fifo_read_end:
- if ((pkt->actual == pkt->length) || /* receive all data */
- (total_len < maxp)) { /* short packet */
- *is_done = 1;
- usbhsf_rx_irq_ctrl(pipe, 0);
- usbhs_pipe_disable(pipe);
- }
-
dev_dbg(dev, " recv %d (%d/ %d/ %d/ %d)\n",
usbhs_pipe_number(pipe),
pkt->length, pkt->actual, *is_done, pkt->zero);
--
1.7.4.1
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