linux-kernel - [PATCH 3/3] bus: fsl-mc: probe the allocatable objects first

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Message-Id: <20200717154800.17169-4-ioana.ciornei@nxp.com>
Date:   Fri, 17 Jul 2020 18:48:00 +0300
From:   Ioana Ciornei <ioana.ciornei@....com>
To:     gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org
Cc:     laurentiu.tudor@....com, Grigore Popescu <grigore.popescu@....com>,
        Ioana Ciornei <ioana.ciornei@....com>
Subject: [PATCH 3/3] bus: fsl-mc: probe the allocatable objects first

From: Grigore Popescu <grigore.popescu@....com>

Because the DPNIs are probed before DPMCPs and other objects that need
to be allocated, messages like "No more resources of type X left" are
printed by the fsl-mc bus driver. This patch resolves the issue by probing
the allocatable objects first and then any other object that may use
them.

Signed-off-by: Grigore Popescu <grigore.popescu@....com>
Signed-off-by: Ioana Ciornei <ioana.ciornei@....com>
---
 drivers/bus/fsl-mc/dprc-driver.c | 57 ++++++++++++++++++++++----------
 1 file changed, 40 insertions(+), 17 deletions(-)

diff --git a/drivers/bus/fsl-mc/dprc-driver.c b/drivers/bus/fsl-mc/dprc-driver.c
index c8b1c3842c1a..3512d1b95821 100644
--- a/drivers/bus/fsl-mc/dprc-driver.c
+++ b/drivers/bus/fsl-mc/dprc-driver.c
@@ -27,7 +27,16 @@ static bool fsl_mc_device_match(struct fsl_mc_device *mc_dev,
 {
 	return mc_dev->obj_desc.id == obj_desc->id &&
 	       strcmp(mc_dev->obj_desc.type, obj_desc->type) == 0;
+}
 
+static bool fsl_mc_obj_desc_is_allocatable(struct fsl_mc_obj_desc *obj)
+{
+	if (strcmp(obj->type, "dpmcp") == 0 ||
+	    strcmp(obj->type, "dpcon") == 0 ||
+	    strcmp(obj->type, "dpbp") == 0)
+		return true;
+	else
+		return false;
 }
 
 static int __fsl_mc_device_remove_if_not_in_mc(struct device *dev, void *data)
@@ -150,6 +159,27 @@ static void check_plugged_state_change(struct fsl_mc_device *mc_dev,
 	}
 }
 
+static void fsl_mc_obj_device_add(struct fsl_mc_device *mc_bus_dev,
+				  struct fsl_mc_obj_desc *obj_desc)
+{
+	int error;
+	struct fsl_mc_device *child_dev;
+
+	/*
+	 * Check if device is already known to Linux:
+	 */
+	child_dev = fsl_mc_device_lookup(obj_desc, mc_bus_dev);
+	if (child_dev) {
+		check_plugged_state_change(child_dev, obj_desc);
+		put_device(&child_dev->dev);
+	} else {
+		error = fsl_mc_device_add(obj_desc, NULL, &mc_bus_dev->dev,
+					  &child_dev);
+		if (error < 0)
+			return;
+	}
+}
+
 /**
  * dprc_add_new_devices - Adds devices to the logical bus for a DPRC
  *
@@ -166,30 +196,23 @@ static void dprc_add_new_devices(struct fsl_mc_device *mc_bus_dev,
 				 struct fsl_mc_obj_desc *obj_desc_array,
 				 int num_child_objects_in_mc)
 {
-	int error;
 	int i;
 
+	/* probe the allocable objects first */
 	for (i = 0; i < num_child_objects_in_mc; i++) {
-		struct fsl_mc_device *child_dev;
 		struct fsl_mc_obj_desc *obj_desc = &obj_desc_array[i];
 
-		if (strlen(obj_desc->type) == 0)
-			continue;
+		if (strlen(obj_desc->type) > 0 &&
+		    fsl_mc_obj_desc_is_allocatable(obj_desc))
+			fsl_mc_obj_device_add(mc_bus_dev, obj_desc);
+	}
 
-		/*
-		 * Check if device is already known to Linux:
-		 */
-		child_dev = fsl_mc_device_lookup(obj_desc, mc_bus_dev);
-		if (child_dev) {
-			check_plugged_state_change(child_dev, obj_desc);
-			put_device(&child_dev->dev);
-			continue;
-		}
+	for (i = 0; i < num_child_objects_in_mc; i++) {
+		struct fsl_mc_obj_desc *obj_desc = &obj_desc_array[i];
 
-		error = fsl_mc_device_add(obj_desc, NULL, &mc_bus_dev->dev,
-					  &child_dev);
-		if (error < 0)
-			continue;
+		if (strlen(obj_desc->type) > 0 &&
+		    !fsl_mc_obj_desc_is_allocatable(obj_desc))
+			fsl_mc_obj_device_add(mc_bus_dev, obj_desc);
 	}
 }
 
-- 
2.25.1