From: Wei Li <weili@codeaurora.org>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: linux-kernel@vger.kernel.org, vatsa@codeaurora.org,
Wei Li <weili@codeaurora.org>
Subject: [PATCH] driver-core: remove lock for platform devices during probe
Date: Mon, 24 Apr 2017 13:42:16 +0800 [thread overview]
Message-ID: <1493012536-9240-1-git-send-email-weili@codeaurora.org> (raw)
During driver probe procedure, lock on the parent of
platform devices could be removed to make probe in
parallel.
Signed-off-by: Wei Li <weili@codeaurora.org>
---
drivers/base/dd.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/base/dd.c b/drivers/base/dd.c
index a1fbf55..e238fbc 100644
--- a/drivers/base/dd.c
+++ b/drivers/base/dd.c
@@ -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"
@@ -749,13 +750,14 @@ static int __driver_attach(struct device *dev, void *data)
return ret;
} /* ret > 0 means positive match */
- if (dev->parent) /* Needed for USB */
+ if (dev->parent &&
+ (dev->bus != &platform_bus_type)) /* 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 (dev->parent && (dev->bus != &platform_bus_type))
device_unlock(dev->parent);
return 0;
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,\na Linux Foundation Collaborative Project
next reply other threads:[~2017-04-24 5:42 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-04-24 5:42 Wei Li [this message]
2017-04-24 7:32 ` [PATCH] driver-core: remove lock for platform devices during probe Greg Kroah-Hartman
2017-04-24 8:27 ` weili
2017-04-24 8:46 ` Greg Kroah-Hartman
2017-04-25 8:43 ` weili
2017-04-25 11:36 ` Greg Kroah-Hartman
2017-05-02 2:18 ` weili
2017-05-02 18:37 ` Greg Kroah-Hartman
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