[PATCH] Fix resource leaks on error paths in plda_init_interrupts()

[Ali Tariq <alitariq45892@gmail.com>]

plda_init_interrupts() initializes IRQ domains and creates IRQ mapping but
does not unwind them when later step fails.

If platform_get_irq() or either irq_create_mapping() fails
in plda_init_interrupts(), the domains are never deinitialized. If
irq_create_mapping() fails, port->intx_irq stays initialized.

Add shared error handling labels for error paths to deinitialize IRQ
mappings and IRQ domains.

This issue was found by automated review of sashiko-bot

Fixes: 4602c370bdf6 ("PCI: microchip: Move IRQ functions to pcie-plda-host.c")
Fixes: 76c911396807 ("PCI: plda: Add host init/deinit and map bus functions")
Link: https://lore.kernel.org/linux-pci/20260718120701.DF4111F000E9@smtp.kernel.org/
Signed-off-by: Ali Tariq <alitariq45892@gmail.com>
Cc: stable@vger.kernel.org
---
 drivers/pci/controller/plda/pcie-plda-host.c | 30 +++++++++++++++-----
 1 file changed, 23 insertions(+), 7 deletions(-)

diff --git a/drivers/pci/controller/plda/pcie-plda-host.c b/drivers/pci/controller/plda/pcie-plda-host.c
index cda8fdb088fd..a2d7079aec73 100644
--- a/drivers/pci/controller/plda/pcie-plda-host.c
+++ b/drivers/pci/controller/plda/pcie-plda-host.c
@@ -419,6 +419,8 @@ static int plda_pcie_init_irq_domains(struct plda_pcie_rp *port)
 	return plda_allocate_msi_domains(port);
 }
 
+static void plda_pcie_irq_domain_deinit(struct plda_pcie_rp *pcie);
+
 int plda_init_interrupts(struct platform_device *pdev,
 			 struct plda_pcie_rp *port,
 			 const struct plda_event *event)
@@ -440,14 +442,17 @@ int plda_init_interrupts(struct platform_device *pdev,
 	}
 
 	port->irq = platform_get_irq(pdev, 0);
-	if (port->irq < 0)
-		return -ENODEV;
+	if (port->irq < 0) {
+		ret = -ENODEV;
+		goto err_irq_domain_deinit;
+	}
 
 	for_each_set_bit(i, &port->events_bitmap, port->num_events) {
 		event_irq = irq_create_mapping(port->event_domain, i);
 		if (!event_irq) {
 			dev_err(dev, "failed to map hwirq %d\n", i);
-			return -ENXIO;
+			ret = -ENXIO;
+			goto err_irq_domain_deinit;
 		}
 
 		if (event->request_event_irq)
@@ -459,7 +464,7 @@ int plda_init_interrupts(struct platform_device *pdev,
 
 		if (ret) {
 			dev_err(dev, "failed to request IRQ %d\n", event_irq);
-			return ret;
+			goto err_irq_domain_deinit;
 		}
 	}
 
@@ -467,7 +472,8 @@ int plda_init_interrupts(struct platform_device *pdev,
 					    event->intx_event);
 	if (!port->intx_irq) {
 		dev_err(dev, "failed to map INTx interrupt\n");
-		return -ENXIO;
+		ret = -ENXIO;
+		goto err_irq_domain_deinit;
 	}
 
 	/* Plug the INTx chained handler */
@@ -475,8 +481,11 @@ int plda_init_interrupts(struct platform_device *pdev,
 
 	port->msi_irq = irq_create_mapping(port->event_domain,
 					   event->msi_event);
-	if (!port->msi_irq)
-		return -ENXIO;
+	if (!port->msi_irq) {
+		dev_err(dev, "failed to map MSI interrupt\n");
+		ret = -ENXIO;
+		goto err_dispose_irq_mapping;
+	}
 
 	/* Plug the MSI chained handler */
 	irq_set_chained_handler_and_data(port->msi_irq, plda_handle_msi, port);
@@ -485,6 +494,13 @@ int plda_init_interrupts(struct platform_device *pdev,
 	irq_set_chained_handler_and_data(port->irq, plda_handle_event, port);
 
 	return 0;
+
+err_dispose_irq_mapping:
+	irq_dispose_mapping(port->intx_irq);
+err_irq_domain_deinit:
+	plda_pcie_irq_domain_deinit(port);
+
+	return ret;
 }
 EXPORT_SYMBOL_GPL(plda_init_interrupts);
 
-- 
2.34.1