linux-kernel - Re: [PATCH, resubmit] ax88179_178a: ASIX AX88179_178A USB 3.0/2.0 to gigabit ethernet adapter driver

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Date:	Thu, 07 Feb 2013 15:05:35 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	bhutchings@...arflare.com
Cc:	freddy@...x.com.tw, netdev@...r.kernel.org,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH, resubmit] ax88179_178a: ASIX AX88179_178A USB 3.0/2.0
 to gigabit ethernet adapter driver

From: Ben Hutchings <bhutchings@...arflare.com>
Date: Thu, 7 Feb 2013 20:02:55 +0000

> On Thu, 2013-02-07 at 21:39 +0800, Freddy Xin wrote:
>> From: Freddy Xin <freddy@...x.com.tw>
>> 
>> This is a resubmission.
>> Added "const" to ethtool_ops structure and fixed the coding style of AX88179_BULKIN_SIZE array.
>> Fixed the issue that the default MTU is not 1500.
>> Added ax88179_change_mtu function and enabled the hardware jumbo frame function to support an
>> MTU higher than 1500.
>> Fixed indentation and empty line coding style errors.
>> The _nopm version usb functions were added to access register in suspend and resume functions.
>> Serveral variables allocted dynamically were removed and replaced by stack variables.
>> ax88179_get_eeprom were modified from asix_get_eeprom in asix_common.
>> 
>> This patch adds a driver for ASIX's AX88179 family of USB 3.0/2.0
>> to gigabit ethernet adapters. It's based on the AX88xxx driver but
>> the usb commands used to access registers for AX88179 are completely different.
>> This driver had been verified on x86 system with AX88179/AX88178A and
>> Sitcomm LN-032 USB dongles.
>> 
>> Signed-off-by: Freddy Xin <freddy@...x.com.tw>
> [...]
>> --- /dev/null
>> +++ b/drivers/net/usb/ax88179_178a.c
> [...]
>> +struct ax88179_data {
>> +       u16 rxctl;
>> +};
> 
> Should also be declared __packed, as on some architectures it may be
> padded to 4 bytes.

Packed is evil and should be avoid everywhere that it is possible to
do so.  It's going to use byte loads on this u16 on RISC cpus simply
because __packed makes it so that the compiler cannot assume data
alignment any longer.
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