linux-kernel - Re: [PATCH] net: ethtool: Return -EOPNOTSUPP if user space tries to read EEPROM with lengh 0

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Message-ID: <20141031035635.GC4082@lunn.ch>
Date:	Fri, 31 Oct 2014 04:56:35 +0100
From:	Andrew Lunn <andrew@...n.ch>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
	Andrew Lunn <andrew@...n.ch>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: ethtool: Return -EOPNOTSUPP if user space tries to
 read EEPROM with lengh 0

On Thu, Oct 30, 2014 at 08:50:15PM -0700, Guenter Roeck wrote:
> If a driver supports reading EEPROM but no EEPROM is installed in the system,
> the driver's get_eeprom_len function returns 0. ethtool will subsequently
> try to read that zero-length EEPROM anyway. If the driver does not support
> EEPROM access at all, this operation will return -EOPNOTSUPP. If the driver
> does support EEPROM access but no EEPROM is installed, the operation will
> return -EINVAL. Return -EOPNOTSUPP in both cases for consistency.
> 
> Signed-off-by: Guenter Roeck <linux@...ck-us.net>

root@...665:~# ethtool -e lan4
Cannot get EEPROM data: Operation not supported

Tested-by: Andrew Lunn <andrew@...n.ch>

Thanks
	Andrew
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