linux-kernel - Re: [RESEND PATCH 0/9] eeprom: at24: at24cs series serial number read

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Message-ID: <CAMpxmJWkioHCLZnJ7LfK3Y4K4jJ2iPMaZ4Kaj_BmAwXqYfW76A@mail.gmail.com>
Date:	Wed, 21 Oct 2015 16:42:04 +0200
From:	Bartosz Golaszewski <bgolaszewski@...libre.com>
To:	Peter Korsgaard <peter@...sgaard.com>
Cc:	Wolfram Sang <wsa@...-dreams.de>,
	linux-i2c <linux-i2c@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RESEND PATCH 0/9] eeprom: at24: at24cs series serial number read

2015-10-21 16:23 GMT+02:00 Peter Korsgaard <peter@...sgaard.com>:
>>>>>> "Bartosz" == Bartosz Golaszewski <bgolaszewski@...libre.com> writes:
>
>  >> As the serial number is available on a separate i2c address, wouldn't
>  >> it be simpler to handle these as special (read only) device variants and
>  >> instantiate E.G. a 24c64 (for the normal data) and a 24cs64 (for the
>  >> serial)?
>  >>
>
>  > Hi Peter,
>
>  > I wanted to respond that this way we would not be protected from
>  > concurrent accesses, but then I saw I didn't actually include any
>  > locks in the serial read function - my bad. It needs to be fixed as
>  > both memory blocks share the same address pointer.
>
>  > I'll resend the series.
>
> But we're protected by the i2c bus lock, right? You do a single
> i2c_transfer to read the serial number.

Why the at24->lock then?

Best regards,
Bartosz Golaszewski
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