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OpenCloudOS-Kernel
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padata: Use get_online_cpus/put_online_cpus 

This patch puts get_online_cpus/put_online_cpus around the places
we modify the padata cpumask to ensure that no cpu goes offline
during this operation.

Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Steffen Klassert 2010-04-29 14:42:30 +02:00 committed by Herbert Xu
parent 7b389b2cc5
commit 6751fb3c0e
1 changed files with 13 additions and 0 deletions
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13
kernel/padata.c
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@ -441,6 +441,8 @@ int padata_set_cpumask(struct padata_instance *pinst,
mutex_lock(&pinst->lock);
get_online_cpus();
pd = padata_alloc_pd(pinst, cpumask);
if (!pd) {
err = -ENOMEM;
@ -452,6 +454,8 @@ int padata_set_cpumask(struct padata_instance *pinst,
padata_replace(pinst, pd);
out:
put_online_cpus();
mutex_unlock(&pinst->lock);
return err;
@ -485,8 +489,10 @@ int padata_add_cpu(struct padata_instance *pinst, int cpu)
mutex_lock(&pinst->lock);
get_online_cpus();
cpumask_set_cpu(cpu, pinst->cpumask);
err = __padata_add_cpu(pinst, cpu);
put_online_cpus();
mutex_unlock(&pinst->lock);
@ -521,8 +527,10 @@ int padata_remove_cpu(struct padata_instance *pinst, int cpu)
mutex_lock(&pinst->lock);
get_online_cpus();
cpumask_clear_cpu(cpu, pinst->cpumask);
err = __padata_remove_cpu(pinst, cpu);
put_online_cpus();
mutex_unlock(&pinst->lock);
@ -626,6 +634,8 @@ struct padata_instance *padata_alloc(const struct cpumask *cpumask,
if (!pinst)
goto err;
get_online_cpus();
pd = padata_alloc_pd(pinst, cpumask);
if (!pd)
goto err_free_inst;
@ -647,6 +657,8 @@ struct padata_instance *padata_alloc(const struct cpumask *cpumask,
register_hotcpu_notifier(&pinst->cpu_notifier);
#endif
put_online_cpus();
mutex_init(&pinst->lock);
return pinst;
@ -655,6 +667,7 @@ err_free_pd:
padata_free_pd(pd);
err_free_inst:
kfree(pinst);
put_online_cpus();
err:
return NULL;
}