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PCI: dwc: Fix dw_pcie_free_msi() if msi_irq is invalid

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Check msi_irq variable before calling irq_set_chained_handler() and
irq_set_handler_data(), lest we call those functions for an invalid MSI
IRQ.

Signed-off-by: Jisheng Zhang <Jisheng.Zhang@synaptics.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
This commit is contained in:
Jisheng Zhang 2019-03-29 11:56:25 +00:00 committed by Bjorn Helgaas
parent 322f034366
commit 3ebc269c19
1 changed files with 4 additions and 2 deletions
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6
drivers/pci/controller/dwc/pcie-designware-host.c
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@ -298,8 +298,10 @@ int dw_pcie_allocate_domains(struct pcie_port *pp)
void dw_pcie_free_msi(struct pcie_port *pp)
{
irq_set_chained_handler(pp->msi_irq, NULL);
irq_set_handler_data(pp->msi_irq, NULL);
if (pp->msi_irq) {
irq_set_chained_handler(pp->msi_irq, NULL);
irq_set_handler_data(pp->msi_irq, NULL);
}
irq_domain_remove(pp->msi_domain);
irq_domain_remove(pp->irq_domain);