[tip:irq/urgent] irqchip/ls-scfg-msi: Fix MSI affinity handling

[tip-bot for Marc Zyngier]

Commit-ID:  893fbfff976cd069f2e60c3b186dbe3f85504db2
Gitweb:     https://git.kernel.org/tip/893fbfff976cd069f2e60c3b186dbe3f85504db2
Author:     Marc Zyngier <marc.zyngier@xxxxxxx>
AuthorDate: Fri, 22 Jun 2018 10:52:49 +0100
Committer:  Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitDate: Fri, 22 Jun 2018 14:22:00 +0200

irqchip/ls-scfg-msi: Fix MSI affinity handling

The ls-scfs-msi driver is not dealing with the effective affinity
as it should. Let's fix that, and make it clear that the effective
affinity is restricted to a single CPU. Also prevent the driver from
messing with the internals of the affinity setting infrastructure.

Reported-by: Alexandre Belloni <alexandre.belloni@xxxxxxxxxxx>
Signed-off-by: Marc Zyngier <marc.zyngier@xxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Tested-by: Alexandre Belloni <alexandre.belloni@xxxxxxxxxxx>
Cc: Jason Cooper <jason@xxxxxxxxxxxxxx>
Cc: Yang Yingliang <yangyingliang@xxxxxxxxxx>
Cc: Sumit Garg <sumit.garg@xxxxxxxxxx>
Link: https://lkml.kernel.org/r/20180622095254.5906-3-marc.zyngier@xxxxxxx

---
 drivers/irqchip/irq-ls-scfg-msi.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/irqchip/irq-ls-scfg-msi.c b/drivers/irqchip/irq-ls-scfg-msi.c
index 1ec3bfe56693..c671b3212010 100644
--- a/drivers/irqchip/irq-ls-scfg-msi.c
+++ b/drivers/irqchip/irq-ls-scfg-msi.c
@@ -93,8 +93,12 @@ static void ls_scfg_msi_compose_msg(struct irq_data *data, struct msi_msg *msg)
 	msg->address_lo = lower_32_bits(msi_data->msiir_addr);
 	msg->data = data->hwirq;
 
-	if (msi_affinity_flag)
-		msg->data |= cpumask_first(data->common->affinity);
+	if (msi_affinity_flag) {
+		const struct cpumask *mask;
+
+		mask = irq_data_get_effective_affinity_mask(data);
+		msg->data |= cpumask_first(mask);
+	}
 
 	iommu_dma_map_msi_msg(data->irq, msg);
 }
@@ -121,7 +125,7 @@ static int ls_scfg_msi_set_affinity(struct irq_data *irq_data,
 		return -EINVAL;
 	}
 
-	cpumask_copy(irq_data->common->affinity, mask);
+	irq_data_update_effective_affinity(irq_data, cpumask_of(cpu));
 
 	return IRQ_SET_MASK_OK;
 }