Re: [PATCH v9 0/9] Add simple NVMEM Framework via regmap.

From: Srinivas Kandagatla
Date: Mon Aug 10 2015 - 06:37:51 EST

Hi Andrew,

On 09/08/15 16:19, Andrew Lunn wrote:
Hi Srinivas

The AT24 eeprom driver contains the comment:

* Export the EEPROM bytes through sysfs, since that's convenient.
* By default, only root should see the data (maybe passwords etc)

and as you would expect from this:

# ls -l ./devices/platform/soc/soc:aips-bus@40000000/40066000.i2c/i2c-0/0-0050/eeprom
-rw------- 1 root root 512 Aug 9 10:16 ./devices/platform/soc/soc:aips-bus@40000000/40066000.i2c/i2c-0/0-0050/eeprom

The AT25 and the MAX6875 driver are the same.

However nvmem has different defaults:

# ls -l ./devices/platform/soc/soc:aips-bus@40000000/40066000.i2c/i2c-0/0-0050/0-00500/nvmem
-rw-r--r-- 1 root root 0 Aug 9 10:16 ./devices/platform/soc/soc:aips-bus@40000000/40066000.i2c/i2c-0/0-0050/0-00500/nvmem

Yes, nvmem by default sets the read permission for everyone S_IRUGO. Which was the most common use case.

Has this been considered and discussed?
Thanks for bringing this up, No, we did not discuss this explicitly, but it should not be an issue to accommodate this. Provider still have flexibility to configure such things.

As a first patchset we wanted to keep the framework simple and add features as we move on.



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