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From dbd2881ab44968823962a14f6de0ed73f916e7b5 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Pali=20Roh=C3=A1r?= <pali@kernel.org>
Date: Sat, 9 Jul 2022 16:55:54 +0200
Subject: [PATCH 2/9] PCI: aardvark: 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-aardvark.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: 526a76991b7b ("PCI: aardvark: Implement driver 'remove' function and allow to build it as module")
Signed-off-by: Pali Rohár <pali@kernel.org>
---
drivers/pci/controller/pci-aardvark.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/drivers/pci/controller/pci-aardvark.c b/drivers/pci/controller/pci-aardvark.c
index 8f01bf82a754..5dda72ce4d7e 100644
--- a/drivers/pci/controller/pci-aardvark.c
+++ b/drivers/pci/controller/pci-aardvark.c
@@ -1439,6 +1439,14 @@ static int advk_pcie_init_irq_domain(struct advk_pcie *pcie)
static void advk_pcie_remove_irq_domain(struct advk_pcie *pcie)
{
+ int virq, i;
+
+ for (i = 0; i < PCI_NUM_INTX; i++) {
+ virq = irq_find_mapping(pcie->irq_domain, i);
+ if (virq > 0)
+ irq_dispose_mapping(virq);
+ }
+
irq_domain_remove(pcie->irq_domain);
}
--
2.34.1
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