linux-kernel - Re: [PATCH v2] eeprom: at24: check if the chip is functional in probe()

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Message-ID: <20160814221933.GC10501@katana>
Date:	Mon, 15 Aug 2016 00:19:33 +0200
From:	Wolfram Sang <wsa@...-dreams.de>
To:	Bartosz Golaszewski <bgolaszewski@...libre.com>
Cc:	linux-i2c <linux-i2c@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] eeprom: at24: check if the chip is functional in
 probe()

On Fri, Aug 12, 2016 at 01:32:57PM +0200, Bartosz Golaszewski wrote:
> The at24 driver doesn't check if the chip is functional in its probe
> function. This leads to instantiating devices that are not physically
> present. For example the cape EEPROMs for BeagleBone Black are defined
> in the device tree at four addresses on i2c2, but normally only one of
> them is present.
> 
> If the userspace doesn't know the location in advance, it will need to
> check if reading the nvmem attributes fails to determine which EEPROM
> is actually there.
> 
> Try to read a single byte in probe() and bail-out with -ENODEV if the
> read fails.
> 
> Signed-off-by: Bartosz Golaszewski <bgolaszewski@...libre.com>

Applied to for-next, thanks!


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