From: Mahesh Vaidya Date: Thu, 30 Apr 2026 20:43:29 +0000 (-0700) Subject: PCI: altera: Do not dispose parent IRQ mapping X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5ef4bac02189bee0b7c170e352d7a38e13fe9678;p=thirdparty%2Flinux.git PCI: altera: Do not dispose parent IRQ mapping altera_pcie_irq_teardown() calls irq_dispose_mapping() on pcie->irq. However, pcie->irq is the parent IRQ returned by platform_get_irq(), not the mapping created by Altera INTx irq_domain. The Altera driver only sets the chained handler on the parent IRQ. It should detach that handler during teardown, but it should not dispose the parent IRQ mapping, which belongs to the parent interrupt controller's irq_domain. Drop irq_dispose_mapping(pcie->irq) from the teardown path. Note that during irqchip remove(), the child IRQs should've disposed. But since the chained handler itself is removed, there is no way the stale child IRQs (if exists) could fire. So it is safe here. Fixes: ec15c4d0d5d2 ("PCI: altera: Allow building as module") Signed-off-by: Mahesh Vaidya [mani: added a note about IRQ disposal] Signed-off-by: Manivannan Sadhasivam Reviewed-by: Subhransu S. Prusty Cc: stable@vger.kernel.org Link: https://patch.msgid.link/20260430204330.3121003-2-mahesh.vaidya@altera.com --- diff --git a/drivers/pci/controller/pcie-altera.c b/drivers/pci/controller/pcie-altera.c index 3dbb7adc421c4..3d3519b8d88f0 100644 --- a/drivers/pci/controller/pcie-altera.c +++ b/drivers/pci/controller/pcie-altera.c @@ -868,7 +868,6 @@ static void altera_pcie_irq_teardown(struct altera_pcie *pcie) { irq_set_chained_handler_and_data(pcie->irq, NULL, NULL); irq_domain_remove(pcie->irq_domain); - irq_dispose_mapping(pcie->irq); } static int altera_pcie_parse_dt(struct altera_pcie *pcie)