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From aafa075abaa80a17d9ac105e72ab235ddb573aac Mon Sep 17 00:00:00 2001
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Fri, 31 Aug 2018 14:16:30 +0200
Subject: [PATCH 021/347] of: allocate / free phandle cache outside of the
devtree_lock
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.19/older/patches-4.19.246-rt110.tar.xz
The phandle cache code allocates memory while holding devtree_lock which
is a raw_spinlock_t. Memory allocation (and free()) is not possible on
RT while a raw_spinlock_t is held.
Invoke the kfree() and kcalloc() while the lock is dropped.
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Frank Rowand <frowand.list@gmail.com>
Cc: devicetree@vger.kernel.org
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
drivers/of/base.c | 19 +++++++++++++------
1 file changed, 13 insertions(+), 6 deletions(-)
diff --git a/drivers/of/base.c b/drivers/of/base.c
index f0dbb7ad88cf..c59b30bab0e0 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -130,31 +130,34 @@ static u32 phandle_cache_mask;
/*
* Caller must hold devtree_lock.
*/
-static void __of_free_phandle_cache(void)
+static struct device_node** __of_free_phandle_cache(void)
{
u32 cache_entries = phandle_cache_mask + 1;
u32 k;
+ struct device_node **shadow;
if (!phandle_cache)
- return;
+ return NULL;
for (k = 0; k < cache_entries; k++)
of_node_put(phandle_cache[k]);
- kfree(phandle_cache);
+ shadow = phandle_cache;
phandle_cache = NULL;
+ return shadow;
}
int of_free_phandle_cache(void)
{
unsigned long flags;
+ struct device_node **shadow;
raw_spin_lock_irqsave(&devtree_lock, flags);
- __of_free_phandle_cache();
+ shadow = __of_free_phandle_cache();
raw_spin_unlock_irqrestore(&devtree_lock, flags);
-
+ kfree(shadow);
return 0;
}
#if !defined(CONFIG_MODULES)
@@ -189,10 +192,11 @@ void of_populate_phandle_cache(void)
u32 cache_entries;
struct device_node *np;
u32 phandles = 0;
+ struct device_node **shadow;
raw_spin_lock_irqsave(&devtree_lock, flags);
- __of_free_phandle_cache();
+ shadow = __of_free_phandle_cache();
for_each_of_allnodes(np)
if (np->phandle && np->phandle != OF_PHANDLE_ILLEGAL)
@@ -200,12 +204,14 @@ void of_populate_phandle_cache(void)
if (!phandles)
goto out;
+ raw_spin_unlock_irqrestore(&devtree_lock, flags);
cache_entries = roundup_pow_of_two(phandles);
phandle_cache_mask = cache_entries - 1;
phandle_cache = kcalloc(cache_entries, sizeof(*phandle_cache),
GFP_ATOMIC);
+ raw_spin_lock_irqsave(&devtree_lock, flags);
if (!phandle_cache)
goto out;
@@ -217,6 +223,7 @@ void of_populate_phandle_cache(void)
out:
raw_spin_unlock_irqrestore(&devtree_lock, flags);
+ kfree(shadow);
}
void __init of_core_init(void)
--
2.36.1
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