[PATCH v3 2/4] irqchip/imx-irqsteer: Dispose of IRQ mappings in remove()

[Zhipeng.wang_1 at oss.nxp.com]

From: Zhipeng Wang <zhipeng.wang_1 at nxp.com>

remove() tears down the chained handlers and the IRQ domain but never
disposes of the IRQ mappings it created. The parent mappings from
irq_of_parse_and_map() and the child mappings handed out by the domain
are leaked, and the child irq_descs are left pointing at the driver's
irq_chip past irq_domain_remove().

Dispose of the parent mappings alongside the chained handler teardown,
and dispose of the child mappings before removing the domain.

Fixes: 0136afa08967 ("irqchip: Add driver for imx-irqsteer controller")
Signed-off-by: Zhipeng Wang <zhipeng.wang_1 at nxp.com>
---
Changes in v3:
 - Split out of the single v2 patch. In v2 this was folded into the
   module-conversion patch; no functional change.

 drivers/irqchip/irq-imx-irqsteer.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/irqchip/irq-imx-irqsteer.c b/drivers/irqchip/irq-imx-irqsteer.c
index a2f0629b22a3..4a2fe8ba97f5 100644
--- a/drivers/irqchip/irq-imx-irqsteer.c
+++ b/drivers/irqchip/irq-imx-irqsteer.c
@@ -277,7 +277,7 @@ static int imx_irqsteer_probe(struct platform_device *pdev)
 static void imx_irqsteer_remove(struct platform_device *pdev)
 {
 	struct irqsteer_data *irqsteer_data = platform_get_drvdata(pdev);
-	int i;
+	int hwirq, i;
 
 	for (i = 0; i < irqsteer_data->irq_count; i++) {
 		if (!irqsteer_data->irq[i])
@@ -285,8 +285,13 @@ static void imx_irqsteer_remove(struct platform_device *pdev)
 
 		irq_set_chained_handler_and_data(irqsteer_data->irq[i],
 						 NULL, NULL);
+		irq_dispose_mapping(irqsteer_data->irq[i]);
 	}
 
+	for (hwirq = 0; hwirq < irqsteer_data->reg_num * 32; hwirq++)
+		irq_dispose_mapping(irq_find_mapping(irqsteer_data->domain,
+						     hwirq));
+
 	irq_domain_remove(irqsteer_data->domain);
 
 	clk_disable_unprepare(irqsteer_data->ipg_clk);
-- 
2.34.1