[PATCH v7 04/14] PCI: rzg3s-host: Create the INTx IRQ domain before setting the chained handlers

[Claudiu Beznea <claudiu.beznea@kernel.org>]

From: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>

rzg3s_pcie_init_irqdomain() installs the chained INTx handlers before
creating the INTx IRQ domain. irq_set_chained_handler_and_data() also
enables the interrupt, so an INTx interrupt arriving in between is
handled by rzg3s_pcie_intx_irq_handler() while host->intx_domain is
still NULL, leading to a NULL pointer dereference.

Move the IRQ domain creation before the loop that installs the chained
handlers.

Fixes: 7ef502fb35b2 ("PCI: Add Renesas RZ/G3S host controller driver")
Cc: stable@vger.kernel.org
Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
---

Changes in v7:
- none, this patch is new

 drivers/pci/controller/pcie-rzg3s-host.c | 22 ++++++++++------------
 1 file changed, 10 insertions(+), 12 deletions(-)

diff --git a/drivers/pci/controller/pcie-rzg3s-host.c b/drivers/pci/controller/pcie-rzg3s-host.c
index bee3e46d025f..cc985020d962 100644
--- a/drivers/pci/controller/pcie-rzg3s-host.c
+++ b/drivers/pci/controller/pcie-rzg3s-host.c
@@ -1024,6 +1024,16 @@ static int rzg3s_pcie_init_irqdomain(struct rzg3s_pcie_host *host)
 	struct platform_device *pdev = to_platform_device(dev);
 	int i, ret;
 
+	host->intx_domain = irq_domain_create_linear(dev_fwnode(dev),
+						     PCI_NUM_INTX,
+						     &rzg3s_pcie_intx_domain_ops,
+						     host);
+	if (!host->intx_domain) {
+		return dev_err_probe(dev, -EINVAL,
+				     "Failed to add irq domain for INTx IRQs\n");
+	}
+	irq_domain_update_bus_token(host->intx_domain, DOMAIN_BUS_WIRED);
+
 	for (i = 0; i < PCI_NUM_INTX; i++) {
 		char irq_name[5] = {0};
 		int irq;
@@ -1045,18 +1055,6 @@ static int rzg3s_pcie_init_irqdomain(struct rzg3s_pcie_host *host)
 						 host);
 	}
 
-	host->intx_domain = irq_domain_create_linear(dev_fwnode(dev),
-						     PCI_NUM_INTX,
-						     &rzg3s_pcie_intx_domain_ops,
-						     host);
-	if (!host->intx_domain) {
-		ret = -EINVAL;
-		dev_err_probe(dev, ret,
-			      "Failed to add irq domain for INTx IRQs\n");
-		goto teardown_intx;
-	}
-	irq_domain_update_bus_token(host->intx_domain, DOMAIN_BUS_WIRED);
-
 	if (IS_ENABLED(CONFIG_PCI_MSI)) {
 		ret = rzg3s_pcie_init_msi(host);
 
-- 
2.43.0