[PATCH v4 2/3] PCI: dwc: Remove IRQ handler and data in one go

[Martin Kaiser]

Call irq_set_chained_handler_and_data() to clear the chained handler
and the handler's data under irq_desc->lock.

See also 2cf5a03cb29d ("PCI/keystone: Fix race in installing chained
IRQ handler").

Signed-off-by: Martin Kaiser <martin@xxxxxxxxx>
---
v4:
 - resend after two months
 - capitalize the commit message properly
v3:
 - rewrite the commit message again. this is no race condition if we
   remove the interrupt handler. sorry for the noise.
v2:
 - rewrite the commit message to clarify that this is a bugfix

 drivers/pci/controller/dwc/pcie-designware-host.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
index 8a84c005f32b..3837fff48944 100644
--- a/drivers/pci/controller/dwc/pcie-designware-host.c
+++ b/drivers/pci/controller/dwc/pcie-designware-host.c
@@ -258,10 +258,8 @@ int dw_pcie_allocate_domains(struct pcie_port *pp)
 
 static void dw_pcie_free_msi(struct pcie_port *pp)
 {
-	if (pp->msi_irq) {
-		irq_set_chained_handler(pp->msi_irq, NULL);
-		irq_set_handler_data(pp->msi_irq, NULL);
-	}
+	if (pp->msi_irq)
+		irq_set_chained_handler_and_data(pp->msi_irq, NULL, NULL);
 
 	irq_domain_remove(pp->msi_domain);
 	irq_domain_remove(pp->irq_domain);
-- 
2.20.1