openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

ARM: shmobile: Fix device node reference leakage in shmobile_init_delay 

The of_find_compatible_node() function returns a new reference to the
found node. Instead of just adding of_node_put() calls, simplify the
code by moving the CPU identification logic inside the loop over cpu
nodes, in order to lower complexity from O(n) to O(1) by replacing
of_find_compatible_node() calls with of_device_is_compatible().

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Acked-by: Magnus Damm <damm+renesas@opensource.se>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
This commit is contained in:
Laurent Pinchart 2014-05-21 15:31:05 +02:00 committed by Simon Horman
parent 7171511eae
commit edc8fb1d6e
1 changed files with 27 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

46
arch/arm/mach-shmobile/timer.c
View File

@ -59,29 +59,37 @@ void __init shmobile_setup_delay(unsigned int max_cpu_core_mhz,
void __init shmobile_init_delay(void)
{
struct device_node *np, *parent;
u32 max_freq, freq;
struct device_node *np, *cpus;
bool is_a8_a9 = false;
bool is_a15 = false;
u32 max_freq = 0;
max_freq = 0;
cpus = of_find_node_by_path("/cpus");
if (!cpus)
return;
parent = of_find_node_by_path("/cpus");
if (parent) {
for_each_child_of_node(parent, np) {
if (!of_property_read_u32(np, "clock-frequency", &freq))
max_freq = max(max_freq, freq);
}
of_node_put(parent);
for_each_child_of_node(cpus, np) {
u32 freq;
if (!of_property_read_u32(np, "clock-frequency", &freq))
max_freq = max(max_freq, freq);
if (of_device_is_compatible(np, "arm,cortex-a8") ||
of_device_is_compatible(np, "arm,cortex-a9"))
is_a8_a9 = true;
else if (of_device_is_compatible(np, "arm,cortex-a15"))
is_a15 = true;
}
if (max_freq) {
if (of_find_compatible_node(NULL, NULL, "arm,cortex-a8"))
shmobile_setup_delay_hz(max_freq, 1, 3);
else if (of_find_compatible_node(NULL, NULL, "arm,cortex-a9"))
shmobile_setup_delay_hz(max_freq, 1, 3);
else if (of_find_compatible_node(NULL, NULL, "arm,cortex-a15"))
if (!IS_ENABLED(CONFIG_ARM_ARCH_TIMER))
shmobile_setup_delay_hz(max_freq, 2, 4);
}
of_node_put(cpus);
if (!max_freq)
return;
if (is_a8_a9)
shmobile_setup_delay_hz(max_freq, 1, 3);
else if (is_a15 && !IS_ENABLED(CONFIG_ARM_ARCH_TIMER))
shmobile_setup_delay_hz(max_freq, 2, 4);
}
static void __init shmobile_late_time_init(void)