linux-kernel - [PATCH v3 1/8] staging: fsl-mc: static inline function to differentiate root dprc

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Date:	Mon, 8 Feb 2016 17:40:11 -0600
From:	Lijun Pan <Lijun.Pan@...escale.com>
To:	<gregkh@...uxfoundation.org>, <arnd@...db.de>,
	<devel@...verdev.osuosl.org>, <linux-kernel@...r.kernel.org>
CC:	<stuart.yoder@...escale.com>, <itai.katz@...escale.com>,
	<german.rivera@...escale.com>, <leoli@...escale.com>,
	<scottwood@...escale.com>, <agraf@...e.de>,
	<bhamciu1@...escale.com>, <R89243@...escale.com>,
	<bhupesh.sharma@...escale.com>, <nir.erez@...escale.com>,
	<richard.schmitt@...escale.com>, <dan.carpenter@...cle.com>,
	<Lijun.Pan2000@...il.com>, Lijun Pan <Lijun.Pan@...escale.com>
Subject: [PATCH v3 1/8] staging: fsl-mc: static inline function to differentiate root dprc

Define a static inline function is_root_dprc(dev) to tell whether
a device is root dprc or not via platform_bus_type.
Remove fsl_mc_is_root_dprc() because is_root_dprc() is simpler
and easier to understand.

Signed-off-by: Lijun Pan <Lijun.Pan@...escale.com>
---
v3: rebased on top of greg's staging-testing
v2: use static inline function instead of macro
    replace the fsl_mc_is_root_dprc with is_root_dprc

 drivers/staging/fsl-mc/bus/mc-bus.c |   22 +++-------------------
 drivers/staging/fsl-mc/include/mc.h |   14 ++++++++++++++
 2 files changed, 17 insertions(+), 19 deletions(-)

diff --git a/drivers/staging/fsl-mc/bus/mc-bus.c b/drivers/staging/fsl-mc/bus/mc-bus.c
index 9317561..b828985 100644
--- a/drivers/staging/fsl-mc/bus/mc-bus.c
+++ b/drivers/staging/fsl-mc/bus/mc-bus.c
@@ -24,8 +24,6 @@
 
 static struct kmem_cache *mc_dev_cache;
 
-static bool fsl_mc_is_root_dprc(struct device *dev);
-
 /**
  * fsl_mc_bus_match - device to driver matching callback
  * @dev: the MC object device structure to match against
@@ -54,7 +52,7 @@ static int fsl_mc_bus_match(struct device *dev, struct device_driver *drv)
 	 * Only exception is the root DPRC, which is a special case.
 	 */
 	if ((mc_dev->obj_desc.state & DPRC_OBJ_STATE_PLUGGED) == 0 &&
-	    !fsl_mc_is_root_dprc(&mc_dev->dev))
+	    !is_root_dprc(&mc_dev->dev))
 		goto out;
 
 	/*
@@ -238,20 +236,6 @@ static void fsl_mc_get_root_dprc(struct device *dev,
 	}
 }
 
-/**
- * fsl_mc_is_root_dprc - function to check if a given device is a root dprc
- */
-static bool fsl_mc_is_root_dprc(struct device *dev)
-{
-	struct device *root_dprc_dev;
-
-	fsl_mc_get_root_dprc(dev, &root_dprc_dev);
-	if (!root_dprc_dev)
-		return false;
-	else
-		return dev == root_dprc_dev;
-}
-
 static int get_dprc_icid(struct fsl_mc_io *mc_io,
 			 int container_id, u16 *icid)
 {
@@ -545,7 +529,7 @@ void fsl_mc_device_remove(struct fsl_mc_device *mc_dev)
 			mc_dev->mc_io = NULL;
 		}
 
-		if (fsl_mc_is_root_dprc(&mc_dev->dev)) {
+		if (is_root_dprc(&mc_dev->dev)) {
 			if (atomic_read(&root_dprc_count) > 0)
 				atomic_dec(&root_dprc_count);
 			else
@@ -777,7 +761,7 @@ static int fsl_mc_bus_remove(struct platform_device *pdev)
 {
 	struct fsl_mc *mc = platform_get_drvdata(pdev);
 
-	if (WARN_ON(!fsl_mc_is_root_dprc(&mc->root_mc_bus_dev->dev)))
+	if (WARN_ON(!is_root_dprc(&mc->root_mc_bus_dev->dev)))
 		return -EINVAL;
 
 	fsl_mc_device_remove(mc->root_mc_bus_dev);
diff --git a/drivers/staging/fsl-mc/include/mc.h b/drivers/staging/fsl-mc/include/mc.h
index ac7c1ce..6dffa29 100644
--- a/drivers/staging/fsl-mc/include/mc.h
+++ b/drivers/staging/fsl-mc/include/mc.h
@@ -15,6 +15,7 @@
 #include <linux/mod_devicetable.h>
 #include <linux/list.h>
 #include <linux/interrupt.h>
+#include <linux/platform_device.h>
 #include "../include/dprc.h"
 
 #define FSL_MC_VENDOR_FREESCALE	0x1957
@@ -226,4 +227,17 @@ void fsl_mc_free_irqs(struct fsl_mc_device *mc_dev);
 
 extern struct bus_type fsl_mc_bus_type;
 
+/**
+  * is_root_dprc - tell whether dev is root dprc or not.
+  * root dprc's parent is a platform device,
+  * that platform device's bus type is platform_bus_type.
+  * @dev: MC object device
+  * return 1 on root dprc, 0 otherwise
+  */
+static inline bool is_root_dprc(struct device *dev)
+{
+	return ((to_fsl_mc_device(dev)->flags & FSL_MC_IS_DPRC) &&
+		((dev)->bus == &fsl_mc_bus_type) &&
+		((dev)->parent->bus == &platform_bus_type));
+}
 #endif /* _FSL_MC_H_ */
-- 
1.7.9.5