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| author | Jisheng Zhang <jszhang@marvell.com> | 2016-07-14 13:37:27 +0300 |
|---|---|---|
| committer | Russell King <rmk+kernel@armlinux.org.uk> | 2016-07-14 18:30:44 +0300 |
| commit | f222a7695219217c7d8ad9f842242ed223e2a1a4 (patch) | |
| tree | cb3a83cd2a5a7494ceff25d9941db75b4afb9abc /arch/arm/kernel/cpuidle.c | |
| parent | 1a695a905c18548062509178b98bc91e67510864 (diff) | |
| download | linux-f222a7695219217c7d8ad9f842242ed223e2a1a4.tar.xz | |
ARM: 8585/1: cpuidle: fix !cpuidle_ops[cpu].init case during init
Let's assume cpuidle_ops exists but it doesn't implement the according
init callback, current arm_cpuidle_init() will return success to its
caller, but in fact it should return -EOPNOTSUPP.
Signed-off-by: Jisheng Zhang <jszhang@marvell.com>
Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/kernel/cpuidle.c')
| -rw-r--r-- | arch/arm/kernel/cpuidle.c | 14 |
1 files changed, 11 insertions, 3 deletions
diff --git a/arch/arm/kernel/cpuidle.c b/arch/arm/kernel/cpuidle.c index a44b268e12e1..2129b297ec20 100644 --- a/arch/arm/kernel/cpuidle.c +++ b/arch/arm/kernel/cpuidle.c @@ -92,7 +92,8 @@ static const struct cpuidle_ops *__init arm_cpuidle_get_ops(const char *method) * process. * * Return 0 on sucess, -ENOENT if no 'enable-method' is defined, -EOPNOTSUPP if - * no cpuidle_ops is registered for the 'enable-method'. + * no cpuidle_ops is registered for the 'enable-method', or if no init callback + * is defined. */ static int __init arm_cpuidle_read_ops(struct device_node *dn, int cpu) { @@ -110,6 +111,12 @@ static int __init arm_cpuidle_read_ops(struct device_node *dn, int cpu) return -EOPNOTSUPP; } + if (!ops->init) { + pr_warn("cpuidle_ops '%s': no init callback\n", + enable_method); + return -EOPNOTSUPP; + } + cpuidle_ops[cpu] = *ops; /* structure copy */ pr_notice("cpuidle: enable-method property '%s'" @@ -129,7 +136,8 @@ static int __init arm_cpuidle_read_ops(struct device_node *dn, int cpu) * Returns: * 0 on success, * -ENODEV if it fails to find the cpu node in the device tree, - * -EOPNOTSUPP if it does not find a registered cpuidle_ops for this cpu, + * -EOPNOTSUPP if it does not find a registered and valid cpuidle_ops for + * this cpu, * -ENOENT if it fails to find an 'enable-method' property, * -ENXIO if the HW reports a failure or a misconfiguration, * -ENOMEM if the HW report an memory allocation failure @@ -143,7 +151,7 @@ int __init arm_cpuidle_init(int cpu) return -ENODEV; ret = arm_cpuidle_read_ops(cpu_node, cpu); - if (!ret && cpuidle_ops[cpu].init) + if (!ret) ret = cpuidle_ops[cpu].init(cpu_node, cpu); of_node_put(cpu_node); |