linux-kernel - Re: [PATCH 2/2] hwmon: (pmbus) add MFR

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Date:   Wed, 20 Apr 2022 07:15:09 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     wujek dev <dev_public@...ek.eu>
Cc:     Jean Delvare <jdelvare@...e.com>, linux-hwmon@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] hwmon: (pmbus) add MFR_* registers to debugfs

On 4/20/22 06:58, wujek dev wrote:
> ------- Original Message -------
> On Wednesday, April 20th, 2022 at 15:53, Guenter Roeck <linux@...ck-us.net> wrote:
> 
>>
>>
>> On 4/20/22 05:22, Adam Wujek wrote:
>>
>>> Add registers to debugfs:
>>> PMBUS_MFR_ID
>>> PMBUS_MFR_MODEL
>>> PMBUS_MFR_REVISION
>>> PMBUS_MFR_LOCATION
>>> PMBUS_MFR_DATE
>>> PMBUS_MFR_SERIAL
>>>
>>> Signed-off-by: Adam Wujek dev_public@...ek.eu
>>
>>
>> Where is patch 1/2, and why did you resend this patch ?
>>
> There should be no "1/2" since this and the second patch are unrelated.
> I resend it because I rebased it on master.
> 
Please provide change logs and version your patches in the future.

> Adam
> 
>> Guenter
>>
>>> ---
>>> drivers/hwmon/pmbus/pmbus_core.c | 84 ++++++++++++++++++++++++++++++++
>>> 1 file changed, 84 insertions(+)
>>>
>>> diff --git a/drivers/hwmon/pmbus/pmbus_core.c b/drivers/hwmon/pmbus/pmbus_core.c
>>> index 0af7a3d74f47..1dc186780ccf 100644
>>> --- a/drivers/hwmon/pmbus/pmbus_core.c
>>> +++ b/drivers/hwmon/pmbus/pmbus_core.c
>>> @@ -2625,6 +2625,30 @@ static int pmbus_debugfs_get_status(void *data, u64 *val)
>>> DEFINE_DEBUGFS_ATTRIBUTE(pmbus_debugfs_ops_status, pmbus_debugfs_get_status,
>>> NULL, "0x%04llx\n");
>>>
>>> +static ssize_t pmbus_debugfs_mfr_read(struct file *file, char __user *buf,
>>> + size_t count, loff_t *ppos)
>>> +{
>>> + int rc;
>>> + struct pmbus_debugfs_entry *entry = file->private_data;
>>> + char data[I2C_SMBUS_BLOCK_MAX + 2] = { 0 };
>>> +
>>> + rc = i2c_smbus_read_block_data(entry->client, entry->reg, data);
>>> + if (rc < 0)
>>> + return rc;
>>> +
>>> + data[rc] = '\n';
>>> + rc += 2;

Why +2 ?

>>> +
>>> + return simple_read_from_buffer(buf, count, ppos, data, rc);
>>> +}
>>> +
>>> +static const struct file_operations pmbus_debugfs_ops_mfr = {
>>> + .llseek = noop_llseek,
>>> + .read = pmbus_debugfs_mfr_read,
>>> + .write = NULL,
>>> + .open = simple_open,
>>> +};
>>> +
>>> static int pmbus_debugfs_get_pec(void *data, u64 *val)
>>> {
>>> struct i2c_client *client = data;
>>> @@ -2801,6 +2825,66 @@ static int pmbus_init_debugfs(struct i2c_client *client,
>>> &entries[idx++],
>>> &pmbus_debugfs_ops);
>>> }
>>> +
>>> + if (pmbus_check_byte_register(client, i, PMBUS_MFR_ID)) {
>>> + entries[idx].client = client;
>>> + entries[idx].page = i;
>>> + entries[idx].reg = PMBUS_MFR_ID;
>>> + scnprintf(name, PMBUS_NAME_SIZE, "mfr%d_id", i);
>>> + debugfs_create_file(name, 0444, data->debugfs,
>>> + &entries[idx++],
>>> + &pmbus_debugfs_ops_mfr);
>>> + }

You are adding several debugfs entries without increasing the size
of the entries array. That means that up to 16 debugfs entries are
now created into an array of size 10. That won't work.

Guenter