evie/android_kernel_oneplus_msm8998
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driver-core: remove lock for platform devices during probe

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

Change-Id: I5457869e056a55b51dd91937d6202947b13977eb
Signed-off-by: vkakani <vkakani@codeaurora.org>
Signed-off-by: Wei Li <weili@codeaurora.org>
This commit is contained in:
Venkata Rao Kakani 2018-06-25 13:00:59 +05:30 • committed by Gerrit - the friendly Code Review server
parent c7a3fb0e9b
commit 030cf68850
2 changed files with 20 additions and 4 deletions
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4
Makefile
View file

@ -404,7 +404,9 @@ KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
-Wno-format-security \
-std=gnu89 $(call cc-option,-fno-PIE)
ifeq ($(TARGET_BOARD_TYPE),auto)
KBUILD_CFLAGS += -DCONFIG_PLATFORM_AUTO
endif
KBUILD_AFLAGS_KERNEL :=
KBUILD_CFLAGS_KERNEL :=
KBUILD_AFLAGS := -D__ASSEMBLY__ $(call cc-option,-fno-PIE)

20
drivers/base/dd.c
View file

@ -25,6 +25,7 @@
#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"
@ -642,6 +643,20 @@ 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)
{
@ -659,14 +674,13 @@ static int __driver_attach(struct device *dev, void *data)
if (!driver_match_device(drv, dev))
return 0;
if (dev->parent) /* Needed for USB */
if (lock_parent(dev))
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;