linux-kernel - Re: [PATCH 2/2] mtd: spi-nor: core: Add dbg msg for spi_nor_erase_multi

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Date:   Mon, 8 Feb 2021 11:59:22 +0000
From:   <Tudor.Ambarus@...rochip.com>
To:     <p.yadav@...com>
CC:     <Takahiro.Kuwano@...ineon.com>, <miquel.raynal@...tlin.com>,
        <richard@....at>, <vigneshr@...com>,
        <linux-mtd@...ts.infradead.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] mtd: spi-nor: core: Add dbg msg for
 spi_nor_erase_multi_sectors()

On 2/8/21 1:41 PM, Pratyush Yadav wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> 
> On 05/02/21 03:52PM, Tudor Ambarus wrote:
>> Useful when debugging non-uniform erase.
>>
>> Signed-off-by: Tudor Ambarus <tudor.ambarus@...rochip.com>
>> ---
>>  drivers/mtd/spi-nor/core.c | 3 +++
>>  1 file changed, 3 insertions(+)
>>
>> diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c
>> index bcaa161bc7db..7401c60b53e6 100644
>> --- a/drivers/mtd/spi-nor/core.c
>> +++ b/drivers/mtd/spi-nor/core.c
>> @@ -1622,6 +1622,9 @@ static int spi_nor_erase_multi_sectors(struct spi_nor *nor, u64 addr, u32 len)
>>                       if (ret)
>>                               goto destroy_erase_cmd_list;
>>
>> +                     dev_dbg(nor->dev, "erase_cmd->size = 0x%08x, erase_cmd->opcode = 0x%02x, erase_cmd->count = %d\n",
>> +                             cmd->size, cmd->opcode, cmd->count);
>> +
> 
> I don't like the position of this debug message. This prints cmd->count
> _after_ the erase is done but _before_ cmd->count is updated. It might

oh, yes.

> end up giving some wrong or misleading information. Can you either move
> it before the start of the erase or after all the bookkeeping is done?

Before the start of the erase sounds good, but still inside the while,
so that we catch each executed command. And maybe I'll change dev_dbg
to dev_vdbg. I'll made my mind before v2.

Cheers,
ta
> 
>>                       addr += cmd->size;
>>                       cmd->count--;
>>               }
>> --
>> 2.25.1
> 
> --
> Regards,
> Pratyush Yadav
> Texas Instruments Inc.
>