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

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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>
This commit is contained in:
Marek Szyprowski
2014-11-21 15:14:48 +01:00
committed by Felipe Balbi
parent 4ace06e8b3
commit 7ad8096edf
3 changed files with 22 additions and 0 deletions
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2
drivers/usb/dwc2/platform.c
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@@ -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;