PCI: brcmstb: Remove chained IRQ handler and data in one go

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

See also 2cf5a03c ("PCI/keystone: Fix race in installing chained
IRQ handler").

Link: https://lore.kernel.org/r/20210115211532.19837-1-martin@kaiser.cxSigned-off-by: NMartin Kaiser <martin@kaiser.cx>
Signed-off-by: NLorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: NFlorian Fainelli <f.fainelli@gmail.com>
Acked-by: NNicolas Saenz Julienne <nsaenzjulienne@suse.de>

drivers/pci/controller/pcie-brcmstb.c

@@ -603,8 +603,7 @@ static void brcm_msi_remove(struct brcm_pcie *pcie)
 
 	if (!msi)
 		return;
-	irq_set_chained_handler(msi->irq, NULL);
-	irq_set_handler_data(msi->irq, NULL);
+	irq_set_chained_handler_and_data(msi->irq, NULL, NULL);
 	brcm_free_domains(msi);
 }