linux-kernel - [tip:irq/urgent] irq: fix cpumask memory leak on offstack cpumask kernels

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Date:	Fri, 3 Apr 2009 17:15:34 GMT
From:	Yinghai Lu <yinghai@...nel.org>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	yinghai@...nel.org, rusty@...tcorp.com.au, tglx@...utronix.de,
	mingo@...e.hu
Subject: [tip:irq/urgent] irq: fix cpumask memory leak on offstack cpumask kernels

Commit-ID:  9756b15e1b58453a6fd54b85c1ad8515209e10bb
Gitweb:     http://git.kernel.org/tip/9756b15e1b58453a6fd54b85c1ad8515209e10bb
Author:     Yinghai Lu <yinghai@...nel.org>
AuthorDate: Mon, 30 Mar 2009 20:37:20 -0700
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Fri, 3 Apr 2009 19:14:44 +0200

irq: fix cpumask memory leak on offstack cpumask kernels

Need to free the old cpumask for affinity and pending_mask.

Signed-off-by: Yinghai Lu <yinghai@...nel.org>
Acked-by: Rusty Russell <rusty@...tcorp.com.au>
LKML-Reference: <49D18FF0.50707@...nel.org>
Signed-off-by: Ingo Molnar <mingo@...e.hu>


---
 include/linux/irq.h       |   14 ++++++++++++++
 kernel/irq/numa_migrate.c |    1 +
 2 files changed, 15 insertions(+), 0 deletions(-)

diff --git a/include/linux/irq.h b/include/linux/irq.h
index 974890b..99d147e 100644
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -482,6 +482,16 @@ static inline void init_copy_desc_masks(struct irq_desc *old_desc,
 #endif
 }
 
+static inline void free_desc_masks(struct irq_desc *old_desc,
+				   struct irq_desc *new_desc)
+{
+	free_cpumask_var(old_desc->affinity);
+
+#ifdef CONFIG_GENERIC_PENDING_IRQ
+	free_cpumask_var(old_desc->pending_mask);
+#endif
+}
+
 #else /* !CONFIG_SMP */
 
 static inline bool init_alloc_desc_masks(struct irq_desc *desc, int cpu,
@@ -495,6 +505,10 @@ static inline void init_copy_desc_masks(struct irq_desc *old_desc,
 {
 }
 
+static inline void free_desc_masks(struct irq_desc *old_desc,
+				   struct irq_desc *new_desc)
+{
+}
 #endif	/* CONFIG_SMP */
 
 #endif /* _LINUX_IRQ_H */
diff --git a/kernel/irq/numa_migrate.c b/kernel/irq/numa_migrate.c
index 243d612..44bbdcb 100644
--- a/kernel/irq/numa_migrate.c
+++ b/kernel/irq/numa_migrate.c
@@ -54,6 +54,7 @@ static bool init_copy_one_irq_desc(int irq, struct irq_desc *old_desc,
 static void free_one_irq_desc(struct irq_desc *old_desc, struct irq_desc *desc)
 {
 	free_kstat_irqs(old_desc, desc);
+	free_desc_masks(old_desc, desc);
 	arch_free_chip_data(old_desc, desc);
 }
 
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