[PATCH v3 1/2] PCI: iproc: Set affinity mask on MSI interrupts

[Mark Tomlinson]

The core interrupt code expects the irq_set_affinity call to update the
effective affinity for the interrupt. This was not being done, so update
iproc_msi_irq_set_affinity() to do so.

Fixes: 3bc2b2348835 ("PCI: iproc: Add iProc PCIe MSI support")
Signed-off-by: Mark Tomlinson <mark.tomlin...@alliedtelesis.co.nz>
---
changes in v2:
 - Patch 1/2 Added Fixes tag
 - Patch 2/2 Replace original change with change suggested by Bjorn
   Helgaas.

changes in v3:
 - Use bitfield rather than bool to save memory.

 drivers/pci/controller/pcie-iproc-msi.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/drivers/pci/controller/pcie-iproc-msi.c 
b/drivers/pci/controller/pcie-iproc-msi.c
index 3176ad3ab0e5..908475d27e0e 100644
--- a/drivers/pci/controller/pcie-iproc-msi.c
+++ b/drivers/pci/controller/pcie-iproc-msi.c
@@ -209,15 +209,20 @@ static int iproc_msi_irq_set_affinity(struct irq_data 
*data,
        struct iproc_msi *msi = irq_data_get_irq_chip_data(data);
        int target_cpu = cpumask_first(mask);
        int curr_cpu;
+       int ret;
 
        curr_cpu = hwirq_to_cpu(msi, data->hwirq);
        if (curr_cpu == target_cpu)
-               return IRQ_SET_MASK_OK_DONE;
+               ret = IRQ_SET_MASK_OK_DONE;
+       else {
+               /* steer MSI to the target CPU */
+               data->hwirq = hwirq_to_canonical_hwirq(msi, data->hwirq) + 
target_cpu;
+               ret = IRQ_SET_MASK_OK;
+       }
 
-       /* steer MSI to the target CPU */
-       data->hwirq = hwirq_to_canonical_hwirq(msi, data->hwirq) + target_cpu;
+       irq_data_update_effective_affinity(data, cpumask_of(target_cpu));
 
-       return IRQ_SET_MASK_OK;
+       return ret;
 }
 
 static void iproc_msi_irq_compose_msi_msg(struct irq_data *data,
-- 
2.28.0