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Message-ID: <5473F99D.6090505@huawei.com>
Date: Tue, 25 Nov 2014 11:38:05 +0800
From: Hanjun Guo <guohanjun@...wei.com>
To: "Rafael J. Wysocki" <rjw@...ysocki.net>,
Hanjun Guo <hanjun.guo@...aro.org>
CC: Catalin Marinas <catalin.marinas@....com>,
Mark Rutland <mark.rutland@....com>,
Olof Johansson <olof@...om.net>,
Grant Likely <grant.likely@...aro.org>,
Will Deacon <will.deacon@....com>,
Graeme Gregory <graeme.gregory@...aro.org>,
Arnd Bergmann <arnd@...db.de>,
Sudeep Holla <Sudeep.Holla@....com>,
Jon Masters <jcm@...hat.com>,
Jason Cooper <jason@...edaemon.net>,
Marc Zyngier <marc.zyngier@....com>,
Bjorn Helgaas <bhelgaas@...gle.com>,
Daniel Lezcano <daniel.lezcano@...aro.org>,
Mark Brown <broonie@...nel.org>, Rob Herring <robh@...nel.org>,
Robert Richter <rric@...nel.org>,
Lv Zheng <lv.zheng@...el.com>,
Robert Moore <robert.moore@...el.com>,
Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
Liviu Dudau <Liviu.Dudau@....com>,
Randy Dunlap <rdunlap@...radead.org>,
<Charles.Garcia-Tobin@....com>, <Kangkang.Shen@...wei.com>,
<linux-acpi@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>,
<linux-kernel@...r.kernel.org>, <linaro-acpi@...ts.linaro.org>,
"Ashwin Chaugule" <ashwin.chaugule@...aro.org>,
Tomasz Nowicki <tomasz.nowicki@...aro.org>
Subject: Re: [PATCH v5 02/18] ACPI / table: Add new function to get table
entries
On 2014/11/24 22:51, Rafael J. Wysocki wrote:
> On Monday, November 24, 2014 07:03:54 PM Hanjun Guo wrote:
>> On 2014-11-24 9:27, Rafael J. Wysocki wrote:
>>> On Friday, October 17, 2014 09:36:58 PM Hanjun Guo wrote:
>>>> From: Ashwin Chaugule <ashwin.chaugule@...aro.org>
>>>>
>>>> The acpi_table_parse() function has a callback that
>>>> passes a pointer to a table_header. Add a new function
>>>> which takes this pointer and parses its entries. This
>>>> eliminates the need to re-traverse all the tables for
>>>> each call. e.g. as in acpi_table_parse_madt() which is
>>>> normally called after acpi_table_parse().
>>>>
>>>> Acked-by: Grant Likely <grant.likely@...aro.org>
>>>> Signed-off-by: Ashwin Chaugule <ashwin.chaugule@...aro.org>
>>>> Signed-off-by: Tomasz Nowicki <tomasz.nowicki@...aro.org>
>>>> Signed-off-by: Hanjun Guo <hanjun.guo@...aro.org>
>>>> ---
>>>> drivers/acpi/tables.c | 67 ++++++++++++++++++++++++++++++++++---------------
>>>> include/linux/acpi.h | 4 +++
>>>> 2 files changed, 51 insertions(+), 20 deletions(-)
>>>>
>>>> diff --git a/drivers/acpi/tables.c b/drivers/acpi/tables.c
>>>> index 6d5a6cd..21ae521 100644
>>>> --- a/drivers/acpi/tables.c
>>>> +++ b/drivers/acpi/tables.c
>>>> @@ -192,17 +192,14 @@ void acpi_table_print_madt_entry(struct acpi_subtable_header *header)
>>>>
>>>>
>>>> int __init
>>>> -acpi_table_parse_entries(char *id,
>>>> - unsigned long table_size,
>>>> - int entry_id,
>>>> - acpi_tbl_entry_handler handler,
>>>> - unsigned int max_entries)
>>>> +acpi_parse_entries(unsigned long table_size,
>>>> + acpi_tbl_entry_handler handler,
>>>> + struct acpi_table_header *table_header,
>>>> + int entry_id, unsigned int max_entries)
>>>> {
>>>> - struct acpi_table_header *table_header = NULL;
>>>> struct acpi_subtable_header *entry;
>>>> - unsigned int count = 0;
>>>> + int count = 0;
>>>> unsigned long table_end;
>>>> - acpi_size tbl_size;
>>>>
>>>> if (acpi_disabled)
>>>> return -ENODEV;
>>>> @@ -210,13 +207,11 @@ acpi_table_parse_entries(char *id,
>>>> if (!handler)
>>>> return -EINVAL;
>>>>
>>>> - if (strncmp(id, ACPI_SIG_MADT, 4) == 0)
>>>> - acpi_get_table_with_size(id, acpi_apic_instance, &table_header, &tbl_size);
>>>> - else
>>>> - acpi_get_table_with_size(id, 0, &table_header, &tbl_size);
>>>> + if (!table_size)
>>>> + return -EINVAL;
>>>>
>>>> if (!table_header) {
>>>> - pr_warn("%4.4s not present\n", id);
>>>> + pr_warn("Table header not present\n");
>>> The message doesn't make sense any more if the table signature is not printed.
For this message, since no table id is passed, and this message is printed in
acpi_table_parse_entries() before this function is called, I think we can check
the table_header before call this function and remove the printed message here.
>>>
>>>> return -ENODEV;
>>>> }
>>>>
>>>> @@ -232,30 +227,62 @@ acpi_table_parse_entries(char *id,
>>>> if (entry->type == entry_id
>>>> && (!max_entries || count++ < max_entries))
>>>> if (handler(entry, table_end))
>>>> - goto err;
>>>> + return -EINVAL;
>>>>
>>>> /*
>>>> * If entry->length is 0, break from this loop to avoid
>>>> * infinite loop.
>>>> */
>>>> if (entry->length == 0) {
>>>> - pr_err("[%4.4s:0x%02x] Invalid zero length\n", id, entry_id);
>>>> - goto err;
>>>> + pr_err("[0x%02x] Invalid zero length\n", entry_id);
For this one, since the table_header is valid now, we can keep it with:
- pr_err("[%4.4s:0x%02x] Invalid zero length\n", id, entry_id);
+ pr_err("[%4.4s:0x%02x] Invalid zero length\n", table_header->signature, entry_id);
>>> Same here.
>> How about remove the message and return directly?
> We could do that, but for what reason? Is the message not useful?
I agree with you, the message is useful I think, how about the comments above?
Thanks
Hanjun
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