lkml.org 
[lkml]   [2019]   [Apr]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 2/3] ARM: hisi: check of_iomap and fix missing of_node_put
Date
of_find_compatible_node() returns a device node with refcount incremented
and thus needs an explicit of_node_put(). Further relying on an unchecked
of_iomap() which can return NULL is problematic here, after all ctrl_base
is critical enough for hix5hd2_set_cpu() to call BUG() if not available
so a check seems mandated here.

Signed-off-by: Nicholas Mc Guire <hofrat@osadl.org>
0002 Fixes: commit 06cc5c1d4d73 ("ARM: hisi: enable hix5hd2 SoC")
---
Problem found by an experimental coccinelle script

Patch was compile tested with: hisi_defconfig (implies CONFIG_SMP=y)

Patch is against 4.18-rc3 (localversion-next is next-20180712)

arch/arm/mach-hisi/hotplug.c | 14 +++++++++-----
1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/arch/arm/mach-hisi/hotplug.c b/arch/arm/mach-hisi/hotplug.c
index 3b0d1c6..40857bf 100644
--- a/arch/arm/mach-hisi/hotplug.c
+++ b/arch/arm/mach-hisi/hotplug.c
@@ -173,11 +173,15 @@ static bool hix5hd2_hotplug_init(void)
struct device_node *np;

np = of_find_compatible_node(NULL, NULL, "hisilicon,cpuctrl");
- if (np) {
- ctrl_base = of_iomap(np, 0);
- return true;
- }
- return false;
+ if (!np)
+ return false;
+
+ ctrl_base = of_iomap(np, 0);
+ of_node_put(np);
+ if (!ctrl_base)
+ return false;
+
+ return true;
}

void hix5hd2_set_cpu(int cpu, bool enable)
--
2.1.4
\
 
 \ /
  Last update: 2019-04-13 09:22    [W:0.096 / U:2.380 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site