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From a3502251f0a195b584efc6b29ecac0ac53ac582a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Pali=20Roh=C3=A1r?= <pali@kernel.org>
Date: Sat, 9 Jul 2022 16:12:40 +0200
Subject: [PATCH 54/90] PCI: mvebu: Dispose INTx irqs prior to removing INTx
domain
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Documentation for irq_domain_remove() says that all mapping within the
domain must be disposed prior to domain remove.
Currently INTx irqs are not disposed in pci-mvebu.c device unbind callback
which cause that kernel crashes after unloading driver and trying to read
/sys/kernel/debug/irq/irqs/<num> or /proc/interrupts.
Fixes: ec075262648f ("PCI: mvebu: Implement support for legacy INTx interrupts")
Reported-by: Hajo Noerenberg <hajo-linux-bugzilla@noerenberg.de>
Signed-off-by: Pali Rohár <pali@kernel.org>
---
drivers/pci/controller/pci-mvebu.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/drivers/pci/controller/pci-mvebu.c b/drivers/pci/controller/pci-mvebu.c
index d8cba09649ba..0122c65b0269 100644
--- a/drivers/pci/controller/pci-mvebu.c
+++ b/drivers/pci/controller/pci-mvebu.c
@@ -1713,8 +1713,15 @@ static int mvebu_pcie_remove(struct platform_device *pdev)
mvebu_writel(port, ~PCIE_INT_ALL_MASK, PCIE_INT_CAUSE_OFF);
/* Remove IRQ domains. */
- if (port->intx_irq_domain)
+ if (port->intx_irq_domain) {
+ int virq, j;
+ for (j = 0; j < PCI_NUM_INTX; j++) {
+ virq = irq_find_mapping(port->intx_irq_domain, j);
+ if (virq > 0)
+ irq_dispose_mapping(virq);
+ }
irq_domain_remove(port->intx_irq_domain);
+ }
/* Free config space for emulated root bridge. */
pci_bridge_emul_cleanup(&port->bridge);
--
2.34.1
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