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Commit edc8fb1d authored by Laurent Pinchart's avatar Laurent Pinchart Committed by Simon Horman
Browse files

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: default avatarLaurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Acked-by: default avatarMagnus Damm <damm+renesas@opensource.se>
Signed-off-by: default avatarSimon Horman <horms+renesas@verge.net.au>
parent 7171511e

arch/arm/mach-shmobile/timer.c

+29 −21
Original line number Diff line number Diff line
@@ -59,30 +59,38 @@ 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;



	for_each_child_of_node(cpus, np) {

		u32 freq;



	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);



		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"))

	of_node_put(cpus);



	if (!max_freq)

		return;



	if (is_a8_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))

	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)

{