[PATCH 2/2] usb: gadget: f_mass_storage: Optimize schedule() call

schedule was added in sleep_thread() by commit 4b6a3e860878
("usb: gadget: f_mass_storage: Add schedule() in sleep_thread()").
to ensure that watchdog is still reset periodically even on platform
that doesn't implement g_dnl_board_usb_cable_connected() and in case USB
cable is not connected.

Instead of calling schedule() for each for() loop iteration, call
schedule() only in case g_dnl_board_usb_cable_connected() is not
overloaded, in this particular case, g_dnl_board_usb_cable_connected()'s
return value is -EOPNOTSUPP.

Signed-off-by: Patrice Chotard <[email protected]>
---
 drivers/usb/gadget/f_mass_storage.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/gadget/f_mass_storage.c b/drivers/usb/gadget/f_mass_storage.c
index 621852080e2..f467693d2cb 100644
--- a/drivers/usb/gadget/f_mass_storage.c
+++ b/drivers/usb/gadget/f_mass_storage.c
@@ -651,6 +651,7 @@ static void busy_indicator(void)
 static int sleep_thread(struct fsg_common *common)
 {
 	int i = 0, k = 0;
+	int ret;
 
 	/* Wait until a signal arrives or we are woken up */
 	for (;;) {
@@ -673,13 +674,15 @@ static int sleep_thread(struct fsg_common *common)
 				return -EPIPE;
 
 			/* Check cable connection */
-			if (!g_dnl_board_usb_cable_connected())
+			ret = g_dnl_board_usb_cable_connected();
+			if (!ret)
 				return -EIO;
+			if (ret == -EOPNOTSUPP)
+				schedule();
 
 			k = 0;
 		}
 
-		schedule();
 		dm_usb_gadget_handle_interrupts(udcdev);
 	}
 	common->thread_wakeup_needed = 0;

-- 
2.43.0