linux-kernel - [PATCH v2 3/6] irq/domain: add a new callback to domain ops

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Message-Id: <20200211131240.15853-4-brgl@bgdev.pl>
Date:   Tue, 11 Feb 2020 14:12:37 +0100
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Linus Walleij <linus.walleij@...aro.org>,
        Jonathan Cameron <jic23@...nel.org>,
        Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Marc Zyngier <maz@...nel.org>
Cc:     linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-iio@...r.kernel.org,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: [PATCH v2 3/6] irq/domain: add a new callback to domain ops

From: Bartosz Golaszewski <bgolaszewski@...libre.com>

Add the remove() callback to irq_domain_ops which can be used to
automatically dispose of any host data associated with the domain when
irq_domain_remove() is called.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@...libre.com>
---
 include/linux/irqdomain.h | 3 +++
 kernel/irq/irqdomain.c    | 3 +++
 2 files changed, 6 insertions(+)

diff --git a/include/linux/irqdomain.h b/include/linux/irqdomain.h
index 20d38621e2f8..fbc25f464f62 100644
--- a/include/linux/irqdomain.h
+++ b/include/linux/irqdomain.h
@@ -95,6 +95,8 @@ enum irq_domain_bus_token {
  * @unmap: Dispose of such a mapping
  * @xlate: Given a device tree node and interrupt specifier, decode
  *         the hardware irq number and linux irq type value.
+ * @remove: Free any custom resources associated with this domain. This is
+ *          called from irq_domain_remove() before any other code.
  *
  * Functions below are provided by the driver and called whenever a new mapping
  * is created or an old mapping is disposed. The driver can then proceed to
@@ -126,6 +128,7 @@ struct irq_domain_ops {
 	void (*debug_show)(struct seq_file *m, struct irq_domain *d,
 			   struct irq_data *irqd, int ind);
 #endif
+	void (*remove)(struct irq_domain *d);
 };
 
 extern struct irq_domain_ops irq_generic_chip_ops;
diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
index 039427c98af8..b391d2e65bdd 100644
--- a/kernel/irq/irqdomain.c
+++ b/kernel/irq/irqdomain.c
@@ -242,6 +242,9 @@ EXPORT_SYMBOL_GPL(__irq_domain_add);
  */
 void irq_domain_remove(struct irq_domain *domain)
 {
+	if (domain->ops->remove)
+		domain->ops->remove(domain);
+
 	mutex_lock(&irq_domain_mutex);
 	debugfs_remove_domain_dir(domain);
 
-- 
2.25.0