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Commit 673fbaf5 authored by Venkata Rao Kakani's avatar Venkata Rao Kakani
Browse files

driver core: Remove lock for platform devices during probe 



During driver probe procedure, lock on the parent of platform
device could be removed to make probe in parallel.

Change-Id: I12407a93125ddd53e1c53803ce9964e108a6800b
Signed-off-by: default avatarVenkata Rao Kakani <vkakani@codeaurora.org>
parent d55696ba

drivers/base/dd.c

+18 −2
Original line number Diff line number Diff line
@@ -27,6 +27,7 @@ 
#include <linux/async.h>

#include <linux/pm_runtime.h>

#include <linux/pinctrl/devinfo.h>

#include <linux/platform_device.h>



#include "base.h"

#include "power/power.h"
@@ -769,6 +770,21 @@ void device_initial_probe(struct device *dev) 
	__device_attach(dev, true);

}



#ifdef CONFIG_PLATFORM_AUTO

static inline int lock_parent(struct device *dev)

{

	if (!dev->parent || dev->bus == &platform_bus_type)

		return 0;



	return 1;

}

#else

static inline int lock_parent(struct device *dev)

{

	return dev->parent ? 1 : 0;

}

#endif



static int __driver_attach(struct device *dev, void *data)

{

	struct device_driver *drv = data;
@@ -796,13 +812,13 @@ static int __driver_attach(struct device *dev, void *data) 
		return ret;

	} /* ret > 0 means positive match */



	if (dev->parent)	/* Needed for USB */

	if (lock_parent(dev))	/* Needed for USB */

		device_lock(dev->parent);

	device_lock(dev);

	if (!dev->driver)

		driver_probe_device(drv, dev);

	device_unlock(dev);

	if (dev->parent)

	if (lock_parent(dev))

		device_unlock(dev->parent);



	return 0;