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Date: Tue, 10 Oct 2017 18:02:25 -0700
From: frowand.list@...il.com
To: Rob Herring <robh+dt@...nel.org>,
Pantelis Antoniou <pantelis.antoniou@...sulko.com>,
David Airlie <airlied@...ux.ie>, Jyri Sarha <jsarha@...com>
Cc: devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
Mark Rutland <mark.rutland@....com>,
Tomi Valkeinen <tomi.valkeinen@...com>,
dri-devel@...ts.freedesktop.org
Subject: [PATCH] of: overlay: move resolve phandles into of_overlay_apply()
From: Frank Rowand <frank.rowand@...y.com>
Move more code into of_overlay_apply() so that it does not have
to be duplicated by each caller of of_overlay_apply().
The test in of_resolve_phandles() that the overlay tree is detached is
temporarily disabled so that old style overlay unittests do not fail.
Signed-off-by: Frank Rowand <frank.rowand@...y.com>
---
This patch applies on top of the series: "[PATCH 00/12] of: overlay: clean
up device tree overlay code".
While reviewing "[PATCH 09/12] of: overlay: avoid race condition between
applying multiple overlays", Rob asked if of_resolve_phandles() could be
moved into of_overlay_apply(). This patch is what is involved in doing so.
The impact on drivers/gpu/drm/tilcdc/tilcdc_slave_compat.c is not
fully investigated. That driver should be tested on real hardware.
drivers/gpu/drm/tilcdc/tilcdc_slave_compat.c | 13 -------------
drivers/of/of_private.h | 12 ++++++++++++
drivers/of/overlay.c | 10 ++++++++++
drivers/of/resolver.c | 7 +++++++
drivers/of/unittest.c | 11 -----------
include/linux/of.h | 22 ----------------------
6 files changed, 29 insertions(+), 46 deletions(-)
diff --git a/drivers/gpu/drm/tilcdc/tilcdc_slave_compat.c b/drivers/gpu/drm/tilcdc/tilcdc_slave_compat.c
index c99f7924b1c6..54025af534d4 100644
--- a/drivers/gpu/drm/tilcdc/tilcdc_slave_compat.c
+++ b/drivers/gpu/drm/tilcdc/tilcdc_slave_compat.c
@@ -145,7 +145,6 @@ static struct device_node * __init tilcdc_get_overlay(struct kfree_table *kft)
__dtb_tilcdc_slave_compat_begin;
static void *overlay_data;
struct device_node *overlay;
- int ret;
if (!size) {
pr_warn("%s: No overlay data\n", __func__);
@@ -164,11 +163,6 @@ static struct device_node * __init tilcdc_get_overlay(struct kfree_table *kft)
}
of_node_set_flag(overlay, OF_DETACHED);
- ret = of_resolve_phandles(overlay);
- if (ret) {
- pr_err("%s: Failed to resolve phandles: %d\n", __func__, ret);
- return NULL;
- }
return overlay;
}
@@ -221,11 +215,6 @@ static void __init tilcdc_convert_slave_node(void)
goto out;
}
- /*
- * protect from of_resolve_phandles() through of_overlay_apply()
- */
- of_overlay_mutex_lock();
-
overlay = tilcdc_get_overlay(&kft);
if (!overlay)
goto out;
@@ -261,8 +250,6 @@ static void __init tilcdc_convert_slave_node(void)
pr_info("%s: ti,tilcdc,slave node successfully converted\n",
__func__);
out:
- of_overlay_mutex_unlock();
-
kfree_table_free(&kft);
of_node_put(i2c);
of_node_put(slave);
diff --git a/drivers/of/of_private.h b/drivers/of/of_private.h
index 0c9e473801f2..267edb1b50df 100644
--- a/drivers/of/of_private.h
+++ b/drivers/of/of_private.h
@@ -59,6 +59,18 @@ static inline int of_property_notify(int action, struct device_node *np,
}
#endif /* CONFIG_OF_DYNAMIC */
+#if defined(CONFIG_OF_RESOLVE)
+int of_resolve_phandles(struct device_node *tree);
+#endif
+
+#if defined(CONFIG_OF_OVERLAY)
+void of_overlay_mutex_lock(void);
+void of_overlay_mutex_unlock(void);
+#else
+static inline void of_overlay_mutex_lock(void) {};
+static inline void of_overlay_mutex_unlock(void) {};
+#endif
+
#if defined(CONFIG_OF_UNITTEST) && defined(CONFIG_OF_OVERLAY)
extern void __init unittest_unflatten_overlay_base(void);
#else
diff --git a/drivers/of/overlay.c b/drivers/of/overlay.c
index 88df2986b03f..dc7657329aea 100644
--- a/drivers/of/overlay.c
+++ b/drivers/of/overlay.c
@@ -696,6 +696,12 @@ int of_overlay_apply(struct device_node *tree, int *ovcs_id)
goto out;
}
+ of_overlay_mutex_lock();
+
+ ret = of_resolve_phandles(tree);
+ if (ret)
+ goto err_overlay_unlock;
+
mutex_lock(&of_mutex);
ret = init_overlay_changeset(ovcs, tree);
@@ -741,9 +747,13 @@ int of_overlay_apply(struct device_node *tree, int *ovcs_id)
}
mutex_unlock(&of_mutex);
+ of_overlay_mutex_unlock();
goto out;
+err_overlay_unlock:
+ of_overlay_mutex_unlock();
+
err_free_overlay_changeset:
free_overlay_changeset(ovcs);
diff --git a/drivers/of/resolver.c b/drivers/of/resolver.c
index 99309cb7d372..8a0f52cfe160 100644
--- a/drivers/of/resolver.c
+++ b/drivers/of/resolver.c
@@ -275,11 +275,18 @@ int of_resolve_phandles(struct device_node *overlay)
err = -EINVAL;
goto out;
}
+
+#if 0
+ Temporarily disable check so that old style overlay unittests
+ do not fail when of_resolve_phandles() is moved into
+ of_overlay_apply().
+
if (!of_node_check_flag(overlay, OF_DETACHED)) {
pr_err("overlay not detached\n");
err = -EINVAL;
goto out;
}
+#endif
phandle_delta = live_tree_max_phandle() + 1;
adjust_overlay_phandles(overlay, phandle_delta);
diff --git a/drivers/of/unittest.c b/drivers/of/unittest.c
index f4c8aff21320..cb9b7674f746 100644
--- a/drivers/of/unittest.c
+++ b/drivers/of/unittest.c
@@ -2162,15 +2162,6 @@ static int __init overlay_data_add(int onum)
}
of_node_set_flag(info->np_overlay, OF_DETACHED);
- of_overlay_mutex_lock();
-
- ret = of_resolve_phandles(info->np_overlay);
- if (ret) {
- pr_err("resolve ot phandles (ret=%d), %d\n", ret, onum);
- of_overlay_mutex_unlock();
- goto out_free_np_overlay;
- }
-
info->overlay_id = 0;
ret = of_overlay_apply(info->np_overlay, &info->overlay_id);
if (ret < 0) {
@@ -2179,8 +2170,6 @@ static int __init overlay_data_add(int onum)
goto out_free_np_overlay;
}
- of_overlay_mutex_unlock();
-
pr_debug("__dtb_overlay_begin applied, overlay id %d\n", ret);
goto out;
diff --git a/include/linux/of.h b/include/linux/of.h
index eb60eddf83c2..55e9ff0fb1fe 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -1273,9 +1273,6 @@ static inline int of_reconfig_get_state_change(unsigned long action,
}
#endif /* CONFIG_OF_DYNAMIC */
-/* CONFIG_OF_RESOLVE api */
-extern int of_resolve_phandles(struct device_node *tree);
-
/**
* of_device_is_system_power_controller - Tells if system-power-controller is found for device_node
* @np: Pointer to the given device_node
@@ -1306,9 +1303,6 @@ struct of_overlay_notify_data {
#ifdef CONFIG_OF_OVERLAY
/* ID based overlays; the API for external users */
-void of_overlay_mutex_lock(void);
-void of_overlay_mutex_unlock(void);
-
int of_overlay_apply(struct device_node *tree, int *ovcs_id);
int of_overlay_remove(int *ovcs_id);
int of_overlay_remove_all(void);
@@ -1318,22 +1312,6 @@ struct of_overlay_notify_data {
#else
-static inline void of_overlay_mutex_lock(void)
-{
-#ifndef CONFIG_OF_RESOLVE
- /* avoid warning in unittest.c */
- WARN(1, "of_overlay_mutex_lock() ifdef'ed out\n");
-#endif
-}
-
-static inline void of_overlay_mutex_unlock(void)
-{
-#ifndef CONFIG_OF_RESOLVE
- /* avoid warning in unittest.c */
- WARN(1, "of_overlay_mutex_unlock() ifdef'ed out\n");
-#endif
-}
-
static inline int of_overlay_apply(struct device_node *tree, int *ovcs_id)
{
return -ENOTSUPP;
--
Frank Rowand <frank.rowand@...y.com>
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