| Message ID | 20240820094023.61155-1-krzysztof.kozlowski@linaro.org |
|---|---|
| State | New |
| Headers | show |
| Series | [v2,1/2] cpuidle: riscv-sbi: Use scoped device node handling to fix missing of_node_put | expand |
On Tue, Aug 20, 2024 at 3:10 PM Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> wrote: > > Two return statements in sbi_cpuidle_dt_init_states() did not drop the > OF node reference count. Solve the issue and simplify entire error > handling with scoped/cleanup.h. > > Fixes: 6abf32f1d9c5 ("cpuidle: Add RISC-V SBI CPU idle driver") > Cc: <stable@vger.kernel.org> > Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> LGTM. Reviewed-by: Anup Patel <anup@brainfault.org> Regards, Anup > > --- > > Changes in v2: > 1. Re-write commit msg, because this is actually a fix. > --- > drivers/cpuidle/cpuidle-riscv-sbi.c | 21 +++++++-------------- > 1 file changed, 7 insertions(+), 14 deletions(-) > > diff --git a/drivers/cpuidle/cpuidle-riscv-sbi.c b/drivers/cpuidle/cpuidle-riscv-sbi.c > index a6e123dfe394..5bb3401220d2 100644 > --- a/drivers/cpuidle/cpuidle-riscv-sbi.c > +++ b/drivers/cpuidle/cpuidle-riscv-sbi.c > @@ -8,6 +8,7 @@ > > #define pr_fmt(fmt) "cpuidle-riscv-sbi: " fmt > > +#include <linux/cleanup.h> > #include <linux/cpuhotplug.h> > #include <linux/cpuidle.h> > #include <linux/cpumask.h> > @@ -236,19 +237,16 @@ static int sbi_cpuidle_dt_init_states(struct device *dev, > { > struct sbi_cpuidle_data *data = per_cpu_ptr(&sbi_cpuidle_data, cpu); > struct device_node *state_node; > - struct device_node *cpu_node; > u32 *states; > int i, ret; > > - cpu_node = of_cpu_device_node_get(cpu); > + struct device_node *cpu_node __free(device_node) = of_cpu_device_node_get(cpu); > if (!cpu_node) > return -ENODEV; > > states = devm_kcalloc(dev, state_count, sizeof(*states), GFP_KERNEL); > - if (!states) { > - ret = -ENOMEM; > - goto fail; > - } > + if (!states) > + return -ENOMEM; > > /* Parse SBI specific details from state DT nodes */ > for (i = 1; i < state_count; i++) { > @@ -264,10 +262,8 @@ static int sbi_cpuidle_dt_init_states(struct device *dev, > > pr_debug("sbi-state %#x index %d\n", states[i], i); > } > - if (i != state_count) { > - ret = -ENODEV; > - goto fail; > - } > + if (i != state_count) > + return -ENODEV; > > /* Initialize optional data, used for the hierarchical topology. */ > ret = sbi_dt_cpu_init_topology(drv, data, state_count, cpu); > @@ -277,10 +273,7 @@ static int sbi_cpuidle_dt_init_states(struct device *dev, > /* Store states in the per-cpu struct. */ > data->states = states; > > -fail: > - of_node_put(cpu_node); > - > - return ret; > + return 0; > } > > static void sbi_cpuidle_deinit_cpu(int cpu) > -- > 2.43.0 >
diff --git a/drivers/cpuidle/cpuidle-riscv-sbi.c b/drivers/cpuidle/cpuidle-riscv-sbi.c index a6e123dfe394..5bb3401220d2 100644 --- a/drivers/cpuidle/cpuidle-riscv-sbi.c +++ b/drivers/cpuidle/cpuidle-riscv-sbi.c @@ -8,6 +8,7 @@ #define pr_fmt(fmt) "cpuidle-riscv-sbi: " fmt +#include <linux/cleanup.h> #include <linux/cpuhotplug.h> #include <linux/cpuidle.h> #include <linux/cpumask.h> @@ -236,19 +237,16 @@ static int sbi_cpuidle_dt_init_states(struct device *dev, { struct sbi_cpuidle_data *data = per_cpu_ptr(&sbi_cpuidle_data, cpu); struct device_node *state_node; - struct device_node *cpu_node; u32 *states; int i, ret; - cpu_node = of_cpu_device_node_get(cpu); + struct device_node *cpu_node __free(device_node) = of_cpu_device_node_get(cpu); if (!cpu_node) return -ENODEV; states = devm_kcalloc(dev, state_count, sizeof(*states), GFP_KERNEL); - if (!states) { - ret = -ENOMEM; - goto fail; - } + if (!states) + return -ENOMEM; /* Parse SBI specific details from state DT nodes */ for (i = 1; i < state_count; i++) { @@ -264,10 +262,8 @@ static int sbi_cpuidle_dt_init_states(struct device *dev, pr_debug("sbi-state %#x index %d\n", states[i], i); } - if (i != state_count) { - ret = -ENODEV; - goto fail; - } + if (i != state_count) + return -ENODEV; /* Initialize optional data, used for the hierarchical topology. */ ret = sbi_dt_cpu_init_topology(drv, data, state_count, cpu); @@ -277,10 +273,7 @@ static int sbi_cpuidle_dt_init_states(struct device *dev, /* Store states in the per-cpu struct. */ data->states = states; -fail: - of_node_put(cpu_node); - - return ret; + return 0; } static void sbi_cpuidle_deinit_cpu(int cpu)
Two return statements in sbi_cpuidle_dt_init_states() did not drop the OF node reference count. Solve the issue and simplify entire error handling with scoped/cleanup.h. Fixes: 6abf32f1d9c5 ("cpuidle: Add RISC-V SBI CPU idle driver") Cc: <stable@vger.kernel.org> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> --- Changes in v2: 1. Re-write commit msg, because this is actually a fix. --- drivers/cpuidle/cpuidle-riscv-sbi.c | 21 +++++++-------------- 1 file changed, 7 insertions(+), 14 deletions(-)