[PATCH 3/5] irqchip: Constify some direct access to irq_data->chip

[Christophe JAILLET <christophe.jaillet@xxxxxxxxxx>]

When the 'chip' member of struct irq_data will be turned into a const
struct irq_chip, the const qualifier will be needed for local variables
that keep a reference to this field.

So start to add some of these const qualifiers.

Signed-off-by: Christophe JAILLET <christophe.jaillet@xxxxxxxxxx>
---
Compile tested only
---
 kernel/irq/chip.c      |  8 ++++----
 kernel/irq/debugfs.c   |  2 +-
 kernel/irq/manage.c    | 10 +++++-----
 kernel/irq/migration.c |  2 +-
 4 files changed, 11 insertions(+), 11 deletions(-)

diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
index 502133dc3b9c..eca39c4dd094 100644
--- a/kernel/irq/chip.c
+++ b/kernel/irq/chip.c
@@ -442,7 +442,7 @@ void unmask_irq(struct irq_desc *desc)
 
 void unmask_threaded_irq(struct irq_desc *desc)
 {
-	struct irq_chip *chip = desc->irq_data.chip;
+	const struct irq_chip *chip = desc->irq_data.chip;
 
 	if (chip->flags & IRQCHIP_EOI_THREADED)
 		chip->irq_eoi(&desc->irq_data);
@@ -687,7 +687,7 @@ static void cond_unmask_eoi_irq(struct irq_desc *desc,
  */
 void handle_fasteoi_irq(struct irq_desc *desc)
 {
-	struct irq_chip *chip = desc->irq_data.chip;
+	const struct irq_chip *chip = desc->irq_data.chip;
 
 	raw_spin_lock(&desc->lock);
 
@@ -1212,7 +1212,7 @@ void irq_cpu_offline(void)
  */
 void handle_fasteoi_ack_irq(struct irq_desc *desc)
 {
-	struct irq_chip *chip = desc->irq_data.chip;
+	const struct irq_chip *chip = desc->irq_data.chip;
 
 	raw_spin_lock(&desc->lock);
 
@@ -1263,7 +1263,7 @@ EXPORT_SYMBOL_GPL(handle_fasteoi_ack_irq);
  */
 void handle_fasteoi_mask_irq(struct irq_desc *desc)
 {
-	struct irq_chip *chip = desc->irq_data.chip;
+	const struct irq_chip *chip = desc->irq_data.chip;
 
 	raw_spin_lock(&desc->lock);
 	mask_ack_irq(desc);
diff --git a/kernel/irq/debugfs.c b/kernel/irq/debugfs.c
index c6ffb97966be..c9c1c28be1a9 100644
--- a/kernel/irq/debugfs.c
+++ b/kernel/irq/debugfs.c
@@ -58,7 +58,7 @@ static const struct irq_bit_descr irqchip_flags[] = {
 static void
 irq_debug_show_chip(struct seq_file *m, struct irq_data *data, int ind)
 {
-	struct irq_chip *chip = data->chip;
+	const struct irq_chip *chip = data->chip;
 
 	if (!chip) {
 		seq_printf(m, "chip: None\n");
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index f0803d6bd296..e7f548bc976b 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -958,7 +958,7 @@ int can_request_irq(unsigned int irq, unsigned long irqflags)
 
 int __irq_set_trigger(struct irq_desc *desc, unsigned long flags)
 {
-	struct irq_chip *chip = desc->irq_data.chip;
+	const struct irq_chip *chip = desc->irq_data.chip;
 	int ret, unmask = 0;
 
 	if (!chip || !chip->irq_set_type) {
@@ -1407,7 +1407,7 @@ static int irq_setup_forced_threading(struct irqaction *new)
 static int irq_request_resources(struct irq_desc *desc)
 {
 	struct irq_data *d = &desc->irq_data;
-	struct irq_chip *c = d->chip;
+	const struct irq_chip *c = d->chip;
 
 	return c->irq_request_resources ? c->irq_request_resources(d) : 0;
 }
@@ -1415,7 +1415,7 @@ static int irq_request_resources(struct irq_desc *desc)
 static void irq_release_resources(struct irq_desc *desc)
 {
 	struct irq_data *d = &desc->irq_data;
-	struct irq_chip *c = d->chip;
+	const struct irq_chip *c = d->chip;
 
 	if (c->irq_release_resources)
 		c->irq_release_resources(d);
@@ -1440,7 +1440,7 @@ static bool irq_supports_nmi(struct irq_desc *desc)
 static int irq_nmi_setup(struct irq_desc *desc)
 {
 	struct irq_data *d = irq_desc_get_irq_data(desc);
-	struct irq_chip *c = d->chip;
+	const struct irq_chip *c = d->chip;
 
 	return c->irq_nmi_setup ? c->irq_nmi_setup(d) : -EINVAL;
 }
@@ -1448,7 +1448,7 @@ static int irq_nmi_setup(struct irq_desc *desc)
 static void irq_nmi_teardown(struct irq_desc *desc)
 {
 	struct irq_data *d = irq_desc_get_irq_data(desc);
-	struct irq_chip *c = d->chip;
+	const struct irq_chip *c = d->chip;
 
 	if (c->irq_nmi_teardown)
 		c->irq_nmi_teardown(d);
diff --git a/kernel/irq/migration.c b/kernel/irq/migration.c
index eb150afd671f..fff2d9cd0239 100644
--- a/kernel/irq/migration.c
+++ b/kernel/irq/migration.c
@@ -39,7 +39,7 @@ void irq_move_masked_irq(struct irq_data *idata)
 {
 	struct irq_desc *desc = irq_data_to_desc(idata);
 	struct irq_data *data = &desc->irq_data;
-	struct irq_chip *chip = data->chip;
+	const struct irq_chip *chip = data->chip;
 
 	if (likely(!irqd_is_setaffinity_pending(data)))
 		return;
-- 
2.47.0