Re: [PATCH V1 2/5] irqchip/loongson-eiointc: Fix incorrect use of acpi_get_vec_parent

From: Jianmin Lv
Date: Mon Mar 27 2023 - 00:00:46 EST




On 2023/3/24 下午11:34, Marc Zyngier wrote:
On Fri, 24 Mar 2023 06:08:51 +0000,
Jianmin Lv <lvjianmin@xxxxxxxxxxx> wrote:

In eiointc_acpi_init(), a *eiointc* node is passed into
acpi_get_vec_parent() instead of a required *NUMA* node (on some chip
like 3C5000L, a *NUMA* node means a *eiointc* node, but on some chip
like 3C5000, a *NUMA* node contains 4 *eiointc* nodes), and node in
struct acpi_vector_group is essentially a *NUMA* node, which will
lead to no parent matched for passed *eiointc* node. so the patch
adjusts code to use *NUMA* node for parameter node of
acpi_set_vec_parent/acpi_get_vec_parent.

Change-Id: Iddd8423f9694cadc1ce28ee290c2e98ca17dfccc
Signed-off-by: Jianmin Lv <lvjianmin@xxxxxxxxxxx>
---
drivers/irqchip/irq-loongson-eiointc.c | 17 +++++++++++------
1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/drivers/irqchip/irq-loongson-eiointc.c b/drivers/irqchip/irq-loongson-eiointc.c
index 62a632d73991..b165c27a3609 100644
--- a/drivers/irqchip/irq-loongson-eiointc.c
+++ b/drivers/irqchip/irq-loongson-eiointc.c
@@ -280,9 +280,6 @@ static void acpi_set_vec_parent(int node, struct irq_domain *parent, struct acpi
{
int i;
- if (cpu_has_flatmode)
- node = cpu_to_node(node * CORES_PER_EIO_NODE);
-
for (i = 0; i < MAX_IO_PICS; i++) {
if (node == vec_group[i].node) {
vec_group[i].parent = parent;
@@ -349,8 +346,13 @@ static int __init pch_pic_parse_madt(union acpi_subtable_headers *header,
static int __init pch_msi_parse_madt(union acpi_subtable_headers *header,
const unsigned long end)
{
+ struct irq_domain *parent;
struct acpi_madt_msi_pic *pchmsi_entry = (struct acpi_madt_msi_pic *)header;
- struct irq_domain *parent = acpi_get_vec_parent(eiointc_priv[nr_pics - 1]->node, msi_group);
+ int node = eiointc_priv[nr_pics - 1]->node;
+
+ if (cpu_has_flatmode)
+ node = cpu_to_node(node * CORES_PER_EIO_NODE);

This is a bit unreadable. I'd rather see:

int node;

if (cpu_has_flatmode)
node = ....;
else
node = ....;

which makes it easy to detect the use of an uninitialised 'node'
rather than using the wrong default variable.

+ parent = acpi_get_vec_parent(node, msi_group);
if (parent)
return pch_msi_acpi_init(parent, pchmsi_entry);
@@ -379,6 +381,7 @@ int __init eiointc_acpi_init(struct irq_domain *parent,
int i, ret, parent_irq;
unsigned long node_map;
struct eiointc_priv *priv;
+ int node = acpi_eiointc->node;
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
if (!priv)
@@ -421,8 +424,10 @@ int __init eiointc_acpi_init(struct irq_domain *parent,
"irqchip/loongarch/intc:starting",
eiointc_router_init, NULL);
- acpi_set_vec_parent(acpi_eiointc->node, priv->eiointc_domain, pch_group);
- acpi_set_vec_parent(acpi_eiointc->node, priv->eiointc_domain, msi_group);
+ if (cpu_has_flatmode)
+ node = cpu_to_node(node * CORES_PER_EIO_NODE);
+ acpi_set_vec_parent(node, priv->eiointc_domain, pch_group);
+ acpi_set_vec_parent(node, priv->eiointc_domain, msi_group);
ret = acpi_cascade_irqdomain_init();
return ret;

Same thing here.


Ok, I'll change them in next version.

Thanks!

M.