[PATCH 6.12.y-cip 25/26] irqchip/renesas-rzg2l: Clear the shared interrupt bit in rzg2l_irqc_free()

From: Biju Das <[email protected]>

[ Upstream commit d3689cd02c5de52ff5f3044169c482aee0dd5a78 ]

rzg2l_irqc_free() invokes irq_domain_free_irqs_common(), which internally
calls irq_domain_reset_irq_data(). That explicitly sets irq_data->hwirq to
0. Consequently, irqd_to_hwirq(d) returns 0 when called after it.

Since 0 falls outside the valid shared IRQ ranges,
rzg2l_irqc_is_shared_and_get_irq_num() evaluates to false, completely
bypassing the test_and_clear_bit() operation.

This leaves the bit set in priv->used_irqs, causing future allocations to
fail with -EBUSY.

Fix this by retrieving irq_data and caching hwirq before calling
irq_domain_free_irqs_common().

Fixes: e0fcae27ff57 ("irqchip/renesas-rzg2l: Add shared interrupt support")
Signed-off-by: Biju Das <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Biju Das <[email protected]>
---
 drivers/irqchip/irq-renesas-rzg2l.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/drivers/irqchip/irq-renesas-rzg2l.c b/drivers/irqchip/irq-renesas-rzg2l.c
index cece433dc1fb..93510bcd79c2 100644
--- a/drivers/irqchip/irq-renesas-rzg2l.c
+++ b/drivers/irqchip/irq-renesas-rzg2l.c
@@ -695,15 +695,14 @@ static int rzg2l_irqc_alloc(struct irq_domain *domain, unsigned int virq,
 
 static void rzg2l_irqc_free(struct irq_domain *domain, unsigned int virq, unsigned int nr_irqs)
 {
+	struct irq_data *d = irq_domain_get_irq_data(domain, virq);
 	struct rzg2l_irqc_priv *priv = domain->host_data;
+	irq_hw_number_t hwirq = irqd_to_hwirq(d);
 
 	irq_domain_free_irqs_common(domain, virq, nr_irqs);
 
-	if (priv->info.shared_irq_cnt) {
-		struct irq_data *d = irq_domain_get_irq_data(domain, virq);
-
-		rzg2l_irqc_shared_irq_free(priv, irqd_to_hwirq(d));
-	}
+	if (priv->info.shared_irq_cnt)
+		rzg2l_irqc_shared_irq_free(priv, hwirq);
 }
 
 static const struct irq_domain_ops rzg2l_irqc_domain_ops = {
-- 
2.43.0