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Commit 758ed196 authored by Marek Szyprowski's avatar Marek Szyprowski Committed by Felipe Balbi
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usb: dwc2: remove no longer needed init_mutex 



init_mutex is a leftover from the time, when s3c-hsotg driver did not
implement proper pull up/down control and emulated it by enabling
enabling/disabling usb phy. Proper pull up/down control has been added
by commit 5b9451f8 ("usb: dwc2: gadget:
use soft-disconnect udc feature in pullup() method"), so init_muxtex can
be removed now to avoid potential deadlocks with other locks.

Signed-off-by: default avatarMarek Szyprowski <m.szyprowski@samsung.com>
Acked-by: default avatarJohn Youn <johnyoun@synopsys.com>
Tested-by: default avatarJohn Youn <johnyoun@synopsys.com>
Signed-off-by: default avatarFelipe Balbi <balbi@ti.com>
parent 145f48c5

drivers/usb/dwc2/core.h

+0 −1
Original line number Diff line number Diff line
@@ -712,7 +712,6 @@ struct dwc2_hsotg { 
	struct regulator_bulk_data supplies[ARRAY_SIZE(dwc2_hsotg_supply_names)];



	spinlock_t lock;

	struct mutex init_mutex;

	void *priv;

	int     irq;

	struct clk *clk;

drivers/usb/dwc2/gadget.c

+0 −17
Original line number Diff line number Diff line
@@ -3193,7 +3193,6 @@ static int dwc2_hsotg_udc_start(struct usb_gadget *gadget, 
		return -EINVAL;

	}



	mutex_lock(&hsotg->init_mutex);

	WARN_ON(hsotg->driver);



	driver->driver.bus = NULL;
@@ -3220,12 +3219,9 @@ static int dwc2_hsotg_udc_start(struct usb_gadget *gadget, 


	dev_info(hsotg->dev, "bound driver %s\n", driver->driver.name);



	mutex_unlock(&hsotg->init_mutex);



	return 0;



err:

	mutex_unlock(&hsotg->init_mutex);

	hsotg->driver = NULL;

	return ret;

}
@@ -3246,8 +3242,6 @@ static int dwc2_hsotg_udc_stop(struct usb_gadget *gadget) 
	if (!hsotg)

		return -ENODEV;



	mutex_lock(&hsotg->init_mutex);



	/* all endpoints should be shutdown */

	for (ep = 1; ep < hsotg->num_of_eps; ep++) {

		if (hsotg->eps_in[ep])
@@ -3270,8 +3264,6 @@ static int dwc2_hsotg_udc_stop(struct usb_gadget *gadget) 


	regulator_bulk_disable(ARRAY_SIZE(hsotg->supplies), hsotg->supplies);



	mutex_unlock(&hsotg->init_mutex);



	return 0;

}
@@ -3307,7 +3299,6 @@ static int dwc2_hsotg_pullup(struct usb_gadget *gadget, int is_on) 
		return 0;

	}



	mutex_lock(&hsotg->init_mutex);

	spin_lock_irqsave(&hsotg->lock, flags);

	if (is_on) {

		hsotg->enabled = 1;
@@ -3321,7 +3312,6 @@ static int dwc2_hsotg_pullup(struct usb_gadget *gadget, int is_on) 


	hsotg->gadget.speed = USB_SPEED_UNKNOWN;

	spin_unlock_irqrestore(&hsotg->lock, flags);

	mutex_unlock(&hsotg->init_mutex);



	return 0;

}
@@ -3832,8 +3822,6 @@ int dwc2_hsotg_suspend(struct dwc2_hsotg *hsotg) 
	if (hsotg->lx_state != DWC2_L0)

		return ret;



	mutex_lock(&hsotg->init_mutex);



	if (hsotg->driver) {

		int ep;
@@ -3861,8 +3849,6 @@ int dwc2_hsotg_suspend(struct dwc2_hsotg *hsotg) 
		clk_disable(hsotg->clk);

	}



	mutex_unlock(&hsotg->init_mutex);



	return ret;

}
@@ -3874,8 +3860,6 @@ int dwc2_hsotg_resume(struct dwc2_hsotg *hsotg) 
	if (hsotg->lx_state == DWC2_L2)

		return ret;



	mutex_lock(&hsotg->init_mutex);



	if (hsotg->driver) {

		dev_info(hsotg->dev, "resuming usb gadget %s\n",

			 hsotg->driver->driver.name);
@@ -3892,7 +3876,6 @@ int dwc2_hsotg_resume(struct dwc2_hsotg *hsotg) 
			dwc2_hsotg_core_connect(hsotg);

		spin_unlock_irqrestore(&hsotg->lock, flags);

	}

	mutex_unlock(&hsotg->init_mutex);



	return ret;

}

drivers/usb/dwc2/platform.c

+0 −1
Original line number Diff line number Diff line
@@ -252,7 +252,6 @@ static int dwc2_driver_probe(struct platform_device *dev) 
	}



	spin_lock_init(&hsotg->lock);

	mutex_init(&hsotg->init_mutex);



	/* Detect config values from hardware */

	retval = dwc2_get_hwparams(hsotg);