linux-kernel - [PATCH v2] irq: generic-chip: provide irq_free_generic

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Message-Id: <1488992645-9980-1-git-send-email-bgolaszewski@baylibre.com>
Date:   Wed,  8 Mar 2017 18:04:05 +0100
From:   Bartosz Golaszewski <bgolaszewski@...libre.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Marc Zyngier <marc.zyngier@....com>
Cc:     linux-kernel@...r.kernel.org,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: [PATCH v2] irq: generic-chip: provide irq_free_generic_chip()

Some users of irq_alloc_generic_chip() are modules which can be
removed (e.g. gpio-ml-ioh) but have no means of freeing the allocated
generic chip. Provide a function for that.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@...libre.com>
---
v1 -> v2:
- added the kernel doc

 include/linux/irq.h       |  1 +
 kernel/irq/generic-chip.c | 12 ++++++++++++
 2 files changed, 13 insertions(+)

diff --git a/include/linux/irq.h b/include/linux/irq.h
index f887351..04e5120 100644
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -950,6 +950,7 @@ void irq_setup_generic_chip(struct irq_chip_generic *gc, u32 msk,
 int irq_setup_alt_chip(struct irq_data *d, unsigned int type);
 void irq_remove_generic_chip(struct irq_chip_generic *gc, u32 msk,
 			     unsigned int clr, unsigned int set);
+void irq_free_generic_chip(struct irq_chip_generic *gc);
 
 struct irq_chip_generic *irq_get_domain_generic_chip(struct irq_domain *d, unsigned int hw_irq);
 
diff --git a/kernel/irq/generic-chip.c b/kernel/irq/generic-chip.c
index ee32870..242836e 100644
--- a/kernel/irq/generic-chip.c
+++ b/kernel/irq/generic-chip.c
@@ -545,6 +545,18 @@ void irq_remove_generic_chip(struct irq_chip_generic *gc, u32 msk,
 }
 EXPORT_SYMBOL_GPL(irq_remove_generic_chip);
 
+/**
+ * irq_free_generic_chip - Free the memory allocated for a chip
+ * @gc:		Generic irq chip
+ *
+ * Free the data previously allocated by irq_allocate_generic_chip().
+ */
+void irq_free_generic_chip(struct irq_chip_generic *gc)
+{
+	kfree(gc);
+}
+EXPORT_SYMBOL_GPL(irq_free_generic_chip);
+
 static struct irq_data *irq_gc_get_irq_data(struct irq_chip_generic *gc)
 {
 	unsigned int virq;
-- 
2.9.3