[PATCH 6.1.y 4/4] PCI: mediatek: Fix IRQ domain leak when port fails to enable

[Sasha Levin <sashal@kernel.org>]

From: Manivannan Sadhasivam <manivannan.sadhasivam@oss.qualcomm.com>

[ Upstream commit f865a57896bd92d7662eb2818d8f48872e2cbbc7 ]

When mtk_pcie_enable_port() fails, mtk_pcie_port_free() removes the port
from pcie->ports and frees the port structure. However, the IRQ domains set
up earlier by mtk_pcie_init_irq_domain() are never freed.

Fix this by refactoring mtk_pcie_irq_teardown() into a per-port helper,
mtk_pcie_irq_teardown_port(), and calling it from mtk_pcie_setup() when
mtk_pcie_enable_port() fails. Since the IRQ teardown must only happen in
the probe error path (during resume, child devices may have active MSI
mappings and the NOIRQ context prohibits sleeping locks),
mtk_pcie_enable_port() is changed to return an error code so callers can
distinguish the two paths and act accordingly.

This issue was reported by Sashiko while reviewing the EcoNet EN7528 SoC
support series.

Fixes: b099631df160 ("PCI: mediatek: Add controller support for MT2712 and MT7622")
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@oss.qualcomm.com>
Signed-off-by: Manivannan Sadhasivam <mani@kernel.org>
Cc: stable@vger.kernel.org # 5.10
Cc: Caleb James DeLisle <cjd@cjdns.fr>
Link: https://patch.msgid.link/20260521174617.17692-1-mani@kernel.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/pci/controller/pcie-mediatek.c | 67 ++++++++++++++++----------
 drivers/pci/pci.h                      |  3 ++
 2 files changed, 45 insertions(+), 25 deletions(-)

diff --git a/drivers/pci/controller/pcie-mediatek.c b/drivers/pci/controller/pcie-mediatek.c
index afda83372beaee..d472e87a5c767c 100644
--- a/drivers/pci/controller/pcie-mediatek.c
+++ b/drivers/pci/controller/pcie-mediatek.c
@@ -537,25 +537,29 @@ static void mtk_pcie_enable_msi(struct mtk_pcie_port *port)
 	writel(val, port->base + PCIE_INT_MASK);
 }
 
-static void mtk_pcie_irq_teardown(struct mtk_pcie *pcie)
+static void mtk_pcie_irq_teardown_port(struct mtk_pcie_port *port)
 {
-	struct mtk_pcie_port *port, *tmp;
+	irq_set_chained_handler_and_data(port->irq, NULL, NULL);
 
-	list_for_each_entry_safe(port, tmp, &pcie->ports, list) {
-		irq_set_chained_handler_and_data(port->irq, NULL, NULL);
+	if (port->irq_domain)
+		irq_domain_remove(port->irq_domain);
 
-		if (port->irq_domain)
-			irq_domain_remove(port->irq_domain);
+	if (IS_ENABLED(CONFIG_PCI_MSI)) {
+		if (port->msi_domain)
+			irq_domain_remove(port->msi_domain);
+		if (port->inner_domain)
+			irq_domain_remove(port->inner_domain);
+	}
 
-		if (IS_ENABLED(CONFIG_PCI_MSI)) {
-			if (port->msi_domain)
-				irq_domain_remove(port->msi_domain);
-			if (port->inner_domain)
-				irq_domain_remove(port->inner_domain);
-		}
+	irq_dispose_mapping(port->irq);
+}
 
-		irq_dispose_mapping(port->irq);
-	}
+static void mtk_pcie_irq_teardown(struct mtk_pcie *pcie)
+{
+	struct mtk_pcie_port *port, *tmp;
+
+	list_for_each_entry_safe(port, tmp, &pcie->ports, list)
+		mtk_pcie_irq_teardown_port(port);
 }
 
 static int mtk_pcie_intx_map(struct irq_domain *domain, unsigned int irq,
@@ -838,7 +842,7 @@ static int mtk_pcie_startup_port(struct mtk_pcie_port *port)
 	return 0;
 }
 
-static void mtk_pcie_enable_port(struct mtk_pcie_port *port)
+static int mtk_pcie_enable_port(struct mtk_pcie_port *port)
 {
 	struct mtk_pcie *pcie = port->pcie;
 	struct device *dev = pcie->dev;
@@ -847,7 +851,7 @@ static void mtk_pcie_enable_port(struct mtk_pcie_port *port)
 	err = clk_prepare_enable(port->sys_ck);
 	if (err) {
 		dev_err(dev, "failed to enable sys_ck%d clock\n", port->slot);
-		goto err_sys_clk;
+		return err;
 	}
 
 	err = clk_prepare_enable(port->ahb_ck);
@@ -895,11 +899,15 @@ static void mtk_pcie_enable_port(struct mtk_pcie_port *port)
 		goto err_phy_on;
 	}
 
-	if (!pcie->soc->startup(port))
-		return;
+	err = pcie->soc->startup(port);
+	if (err) {
+		dev_info(dev, "Port%d link down\n", port->slot);
+		goto err_soc_startup;
+	}
 
-	dev_info(dev, "Port%d link down\n", port->slot);
+	return 0;
 
+err_soc_startup:
 	phy_power_off(port->phy);
 err_phy_on:
 	phy_exit(port->phy);
@@ -915,8 +923,8 @@ static void mtk_pcie_enable_port(struct mtk_pcie_port *port)
 	clk_disable_unprepare(port->ahb_ck);
 err_ahb_clk:
 	clk_disable_unprepare(port->sys_ck);
-err_sys_clk:
-	mtk_pcie_port_free(port);
+
+	return err;
 }
 
 static int mtk_pcie_parse_port(struct mtk_pcie *pcie,
@@ -1084,8 +1092,13 @@ static int mtk_pcie_setup(struct mtk_pcie *pcie)
 		return err;
 
 	/* enable each port, and then check link status */
-	list_for_each_entry_safe(port, tmp, &pcie->ports, list)
-		mtk_pcie_enable_port(port);
+	list_for_each_entry_safe(port, tmp, &pcie->ports, list) {
+		err = mtk_pcie_enable_port(port);
+		if (err) {
+			mtk_pcie_irq_teardown_port(port);
+			mtk_pcie_port_free(port);
+		}
+	}
 
 	/* power down PCIe subsys if slots are all empty (link down) */
 	if (list_empty(&pcie->ports))
@@ -1189,14 +1202,18 @@ static int mtk_pcie_resume_noirq(struct device *dev)
 {
 	struct mtk_pcie *pcie = dev_get_drvdata(dev);
 	struct mtk_pcie_port *port, *tmp;
+	int err;
 
 	if (list_empty(&pcie->ports))
 		return 0;
 
 	clk_prepare_enable(pcie->free_ck);
 
-	list_for_each_entry_safe(port, tmp, &pcie->ports, list)
-		mtk_pcie_enable_port(port);
+	list_for_each_entry_safe(port, tmp, &pcie->ports, list) {
+		err = mtk_pcie_enable_port(port);
+		if (err)
+			mtk_pcie_port_free(port);
+	}
 
 	/* In case of EP was removed while system suspend. */
 	if (list_empty(&pcie->ports))
diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index 8b177931cf21ef..214a0af8b14f64 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -14,6 +14,9 @@
 #define PCI_EXP_AER_FLAGS	(PCI_EXP_DEVCTL_CERE | PCI_EXP_DEVCTL_NFERE | \
 				 PCI_EXP_DEVCTL_FERE | PCI_EXP_DEVCTL_URRE)
 
+/* Power stable to PERST# inactive from PCIe card Electromechanical Spec */
+#define PCIE_T_PVPERL_MS		100
+
 /*
  * PCIe r6.0, sec 5.3.3.2.1 <PME Synchronization>
  * Recommends 1ms to 10ms timeout to check L2 ready.
-- 
2.53.0