Mailing List Archive: [PATCH V2 1/5] irqchip/loongson-eiointc: Fix returned value on parsing MADT

[PATCH V2 1/5] irqchip/loongson-eiointc: Fix returned value on parsing MADT

Mar 31, 2023, 6:15 AM

Post #1 of 3 (22 views)

In pch_pic_parse_madt(), a NULL parent pointer will be
returned from acpi_get_vec_parent() for second pch-pic domain
related to second bridge while calling eiointc_acpi_init() at
first time, where the parent of it has not been initialized
yet, and will be initialized during second time calling
eiointc_acpi_init(). So, it's reasonable to return zero so
that failure of acpi_table_parse_madt() will be avoided, or else
acpi_cascade_irqdomain_init() will return and initialization of
followed pch_msi domain will be skipped.

Although it does not matter when pch_msi_parse_madt() returns
-EINVAL if no invalid parent is found, it's also reasonable to
return zero for that.

Signed-off-by: Jianmin Lv <lvjianmin@loongson.cn>
---
drivers/irqchip/irq-loongson-eiointc.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/irqchip/irq-loongson-eiointc.c b/drivers/irqchip/irq-loongson-eiointc.c
index d15fd38c1756..62a632d73991 100644
--- a/drivers/irqchip/irq-loongson-eiointc.c
+++ b/drivers/irqchip/irq-loongson-eiointc.c
@@ -343,7 +343,7 @@ static int __init pch_pic_parse_madt(union acpi_subtable_headers *header,
if (parent)
return pch_pic_acpi_init(parent, pchpic_entry);

- return -EINVAL;
+ return 0;
}

static int __init pch_msi_parse_madt(union acpi_subtable_headers *header,
@@ -355,7 +355,7 @@ static int __init pch_msi_parse_madt(union acpi_subtable_headers *header,
if (parent)
return pch_msi_acpi_init(parent, pchmsi_entry);

- return -EINVAL;
+ return 0;
}

static int __init acpi_cascade_irqdomain_init(void)
--
2.31.1

Re: [PATCH V2 1/5] irqchip/loongson-eiointc: Fix returned value on parsing MADT [ In reply to ]

gregkh at linuxfoundation

Mar 31, 2023, 8:15 AM

Post #2 of 3 (22 views)

Permalink

On Fri, Mar 31, 2023 at 07:38:56PM +0800, Jianmin Lv wrote:
> In pch_pic_parse_madt(), a NULL parent pointer will be
> returned from acpi_get_vec_parent() for second pch-pic domain
> related to second bridge while calling eiointc_acpi_init() at
> first time, where the parent of it has not been initialized
> yet, and will be initialized during second time calling
> eiointc_acpi_init(). So, it's reasonable to return zero so
> that failure of acpi_table_parse_madt() will be avoided, or else
> acpi_cascade_irqdomain_init() will return and initialization of
> followed pch_msi domain will be skipped.
>
> Although it does not matter when pch_msi_parse_madt() returns
> -EINVAL if no invalid parent is found, it's also reasonable to
> return zero for that.
>
> Signed-off-by: Jianmin Lv <lvjianmin@loongson.cn>
> ---
> drivers/irqchip/irq-loongson-eiointc.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)

<formletter>

This is not the correct way to submit patches for inclusion in the
stable kernel tree. Please read:
https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html
for how to do this properly.

</formletter>

Re: [PATCH V2 1/5] irqchip/loongson-eiointc: Fix returned value on parsing MADT [ In reply to ]

lvjianmin at loongson

Mar 31, 2023, 8:15 PM

Post #3 of 3 (22 views)

Permalink

Ok, thanks, got it.

On 2023/3/31 ??9:17, Greg KH wrote:
> On Fri, Mar 31, 2023 at 07:38:56PM +0800, Jianmin Lv wrote:
>> In pch_pic_parse_madt(), a NULL parent pointer will be
>> returned from acpi_get_vec_parent() for second pch-pic domain
>> related to second bridge while calling eiointc_acpi_init() at
>> first time, where the parent of it has not been initialized
>> yet, and will be initialized during second time calling
>> eiointc_acpi_init(). So, it's reasonable to return zero so
>> that failure of acpi_table_parse_madt() will be avoided, or else
>> acpi_cascade_irqdomain_init() will return and initialization of
>> followed pch_msi domain will be skipped.
>>
>> Although it does not matter when pch_msi_parse_madt() returns
>> -EINVAL if no invalid parent is found, it's also reasonable to
>> return zero for that.
>>
>> Signed-off-by: Jianmin Lv <lvjianmin@loongson.cn>
>> ---
>> drivers/irqchip/irq-loongson-eiointc.c | 4 ++--
>> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> <formletter>
>
> This is not the correct way to submit patches for inclusion in the
> stable kernel tree. Please read:
> https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html
> for how to do this properly.
>
> </formletter>
>