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Subject: Re: [PATCH] RISC-V: Fix of_node_* refcount
From:   Atish Patra <atish.patra@wdc.com>
To:     "linux-riscv@lists.infradead.org" <linux-riscv@lists.infradead.org>
Cc:     "palmer@sifive.com" <palmer@sifive.com>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "anup@brainfault.org" <anup@brainfault.org>,
        "jeremy.linton@arm.com" <jeremy.linton@arm.com>,
        "sudeep.holla@arm.com" <sudeep.holla@arm.com>,
        "schwab@suse.de" <schwab@suse.de>
References: <1542755270-10433-1-git-send-email-atish.patra@wdc.com>
Message-ID: <99bcf158-80f2-efa8-cbcb-01493185852d@wdc.com>
Date:   Tue, 18 Dec 2018 15:55:42 -0800
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On 11/20/18 3:07 PM, Atish Patra wrote:
> Fix of_node* refcount at various places by using of_node_put.
> 
> Signed-off-by: Atish Patra <atish.patra@wdc.com>
> ---
>   arch/riscv/kernel/cacheinfo.c  | 11 +++++++++++
>   arch/riscv/kernel/cpu.c        |  1 +
>   arch/riscv/kernel/cpufeature.c |  2 ++
>   arch/riscv/kernel/perf_event.c |  1 +
>   arch/riscv/kernel/smpboot.c    |  6 +++++-
>   5 files changed, 20 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/riscv/kernel/cacheinfo.c b/arch/riscv/kernel/cacheinfo.c
> index cb35ffd8..638dee3f 100644
> --- a/arch/riscv/kernel/cacheinfo.c
> +++ b/arch/riscv/kernel/cacheinfo.c
> @@ -28,6 +28,7 @@ static int __init_cache_level(unsigned int cpu)
>   {
>   	struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
>   	struct device_node *np = of_cpu_device_node_get(cpu);
> +	struct device_node *prev = NULL;
>   	int levels = 0, leaves = 0, level;
>   
>   	if (of_property_read_bool(np, "cache-size"))
> @@ -39,7 +40,10 @@ static int __init_cache_level(unsigned int cpu)
>   	if (leaves > 0)
>   		levels = 1;
>   
> +	prev = np;
>   	while ((np = of_find_next_cache_node(np))) {
> +		of_node_put(prev);
> +		prev = np;
>   		if (!of_device_is_compatible(np, "cache"))
>   			break;
>   		if (of_property_read_u32(np, "cache-level", &level))
> @@ -55,8 +59,10 @@ static int __init_cache_level(unsigned int cpu)
>   		levels = level;
>   	}
>   
> +	of_node_put(np);
>   	this_cpu_ci->num_levels = levels;
>   	this_cpu_ci->num_leaves = leaves;
> +
>   	return 0;
>   }
>   
> @@ -65,6 +71,7 @@ static int __populate_cache_leaves(unsigned int cpu)
>   	struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
>   	struct cacheinfo *this_leaf = this_cpu_ci->info_list;
>   	struct device_node *np = of_cpu_device_node_get(cpu);
> +	struct device_node *prev = NULL;
>   	int levels = 1, level = 1;
>   
>   	if (of_property_read_bool(np, "cache-size"))
> @@ -74,7 +81,10 @@ static int __populate_cache_leaves(unsigned int cpu)
>   	if (of_property_read_bool(np, "d-cache-size"))
>   		ci_leaf_init(this_leaf++, np, CACHE_TYPE_DATA, level);
>   
> +	prev = np;
>   	while ((np = of_find_next_cache_node(np))) {
> +		of_node_put(prev);
> +		prev = np;
>   		if (!of_device_is_compatible(np, "cache"))
>   			break;
>   		if (of_property_read_u32(np, "cache-level", &level))
> @@ -89,6 +99,7 @@ static int __populate_cache_leaves(unsigned int cpu)
>   			ci_leaf_init(this_leaf++, np, CACHE_TYPE_DATA, level);
>   		levels = level;
>   	}
> +	of_node_put(np);
>   
>   	return 0;
>   }
> diff --git a/arch/riscv/kernel/cpu.c b/arch/riscv/kernel/cpu.c
> index 3a5a2ee3..7b3eb970 100644
> --- a/arch/riscv/kernel/cpu.c
> +++ b/arch/riscv/kernel/cpu.c
> @@ -155,6 +155,7 @@ static int c_show(struct seq_file *m, void *v)
>   	    && strcmp(compat, "riscv"))
>   		seq_printf(m, "uarch\t\t: %s\n", compat);
>   	seq_puts(m, "\n");
> +	of_node_put(node);
>   
>   	return 0;
>   }
> diff --git a/arch/riscv/kernel/cpufeature.c b/arch/riscv/kernel/cpufeature.c
> index 0339087a..a6e369ed 100644
> --- a/arch/riscv/kernel/cpufeature.c
> +++ b/arch/riscv/kernel/cpufeature.c
> @@ -56,8 +56,10 @@ void riscv_fill_hwcap(void)
>   
>   	if (of_property_read_string(node, "riscv,isa", &isa)) {
>   		pr_warning("Unable to find \"riscv,isa\" devicetree entry");
> +		of_node_put(node);
>   		return;
>   	}
> +	of_node_put(node);
>   
>   	for (i = 0; i < strlen(isa); ++i)
>   		elf_hwcap |= isa2hwcap[(unsigned char)(isa[i])];
> diff --git a/arch/riscv/kernel/perf_event.c b/arch/riscv/kernel/perf_event.c
> index a243fae1..667ee70d 100644
> --- a/arch/riscv/kernel/perf_event.c
> +++ b/arch/riscv/kernel/perf_event.c
> @@ -476,6 +476,7 @@ int __init init_hw_perf_events(void)
>   
>   		if (of_id)
>   			riscv_pmu = of_id->data;
> +		of_node_put(node);
>   	}
>   
>   	perf_pmu_register(riscv_pmu->pmu, "cpu", PERF_TYPE_RAW);
> diff --git a/arch/riscv/kernel/smpboot.c b/arch/riscv/kernel/smpboot.c
> index 18cda0e8..fc185eca 100644
> --- a/arch/riscv/kernel/smpboot.c
> +++ b/arch/riscv/kernel/smpboot.c
> @@ -57,12 +57,15 @@ void __init setup_smp(void)
>   
>   	while ((dn = of_find_node_by_type(dn, "cpu"))) {
>   		hart = riscv_of_processor_hartid(dn);
> -		if (hart < 0)
> +		if (hart < 0) {
> +			of_node_put(dn);
>   			continue;
> +		}
>   
>   		if (hart == cpuid_to_hartid_map(0)) {
>   			BUG_ON(found_boot_cpu);
>   			found_boot_cpu = 1;
> +			of_node_put(dn);
>   			continue;
>   		}
>   
> @@ -70,6 +73,7 @@ void __init setup_smp(void)
>   		set_cpu_possible(cpuid, true);
>   		set_cpu_present(cpuid, true);
>   		cpuid++;
> +		of_node_put(dn);
>   	}
>   
>   	BUG_ON(!found_boot_cpu);
> 

ping ?

Regards,
Atish