padata: Allocate the cpumask for the padata instance

The cpumask of the padata instance was used without allocated.
This caused boot crashes if CONFIG_CPUMASK_OFFSTACK is enabled.
This patch fixes this by doing proper allocation for this cpumask.

Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 7 insertions, 1 deletions

diff --git a/kernel/padata.c b/kernel/padata.c
index 6f9bcb8313d6..93caf65ff57c 100644
--- a/kernel/padata.c
+++ b/kernel/padata.c
@@ -642,6 +642,9 @@ struct padata_instance *padata_alloc(const struct cpumask *cpumask,
         if (!pd)
                 goto err_free_inst;
 
+        if (!alloc_cpumask_var(&pinst->cpumask, GFP_KERNEL))
+                goto err_free_pd;
+
         rcu_assign_pointer(pinst->pd, pd);
 
         pinst->wq = wq;
@@ -654,12 +657,14 @@ struct padata_instance *padata_alloc(const struct cpumask *cpumask,
         pinst->cpu_notifier.priority = 0;
         err = register_hotcpu_notifier(&pinst->cpu_notifier);
         if (err)
-                goto err_free_pd;
+                goto err_free_cpumask;
 
         mutex_init(&pinst->lock);
 
         return pinst;
 
+err_free_cpumask:
+        free_cpumask_var(pinst->cpumask);
 err_free_pd:
         padata_free_pd(pd);
 err_free_inst:
@@ -685,6 +690,7 @@ void padata_free(struct padata_instance *pinst)
 
         unregister_hotcpu_notifier(&pinst->cpu_notifier);
         padata_free_pd(pinst->pd);
+        free_cpumask_var(pinst->cpumask);
         kfree(pinst);
 }
 EXPORT_SYMBOL(padata_free);