usb: dwc2: gadget: add mutex to serialize init/deinit calls

This patch adds mutex, which protects initialization and
deinitialization procedures against suspend/resume methods. This mutex
will be needed by the updated suspend/resume calls, which tracks gadget
state.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Acked-by: Paul Zimmerman <paulz@synopsys.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/usb/dwc2/platform.c b/drivers/usb/dwc2/platform.c
index 57eb8a3e022b..ec5658ac52ba 100644
--- a/drivers/usb/dwc2/platform.c
+++ b/drivers/usb/dwc2/platform.c
@@ -40,6 +40,7 @@
 #include <linux/device.h>
 #include <linux/dma-mapping.h>
 #include <linux/of_device.h>
+#include <linux/mutex.h>
 #include <linux/platform_device.h>
 
 #include <linux/usb/of.h>
@@ -212,6 +213,7 @@ static int dwc2_driver_probe(struct platform_device *dev)
         hsotg->dr_mode = of_usb_get_dr_mode(dev->dev.of_node);
 
         spin_lock_init(&hsotg->lock);
+        mutex_init(&hsotg->init_mutex);
         retval = dwc2_gadget_init(hsotg, irq);
         if (retval)
                 return retval;