[PATCH] usb: xhci: pet watchdog during transfers

[seanedmond at linux.microsoft.com]

From: Godfrey Mwangi <godmwan at microsoft.com>

On some platforms with low USB throughput, tranfers
of huge files take a long time and watchdog timer can
expire resulting in hardware reset. Avoid this by
petting the watchdog as long as we have pending transfers.

Signed-off-by: Godfrey Mwangi <godmwan at microsoft.com>
---
 drivers/usb/host/xhci-ring.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c
index c8260cbdf9..de954314bc 100644
--- a/drivers/usb/host/xhci-ring.c
+++ b/drivers/usb/host/xhci-ring.c
@@ -18,6 +18,7 @@
 #include <log.h>
 #include <asm/byteorder.h>
 #include <usb.h>
+#include <watchdog.h>
 #include <asm/unaligned.h>
 #include <linux/bug.h>
 #include <linux/errno.h>
@@ -758,6 +759,8 @@ int xhci_bulk_tx(struct usb_device *udev, unsigned long pipe,
 		/* Calculate length for next transfer */
 		addr += trb_buff_len;
 		trb_buff_len = min((length - running_total), TRB_MAX_BUFF_SIZE);
+
+		schedule();
 	} while (running_total < length);
 
 	giveback_first_trb(udev, ep_index, start_cycle, start_trb);
-- 
2.40.0