linux-kernel - Re: [PATCH v3 03/33] staging: rtl8192e: Mark unaligned memcpy()

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Message-ID: <5558FC58.4040407@gmail.com>
Date:	Sun, 17 May 2015 22:38:48 +0200
From:	Mateusz Kulikowski <mateusz.kulikowski@...il.com>
To:	Dan Carpenter <dan.carpenter@...cle.com>
CC:	devel@...verdev.osuosl.org, gregkh@...uxfoundation.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 03/33] staging: rtl8192e: Mark unaligned memcpy()

On 15.05.2015 01:14, Dan Carpenter wrote:
> On Thu, May 14, 2015 at 10:29:39PM +0200, Mateusz Kulikowski wrote:
>> On 13.05.2015 10:22, Dan Carpenter wrote:
>>> On Tue, May 12, 2015 at 10:00:13PM +0200, Mateusz Kulikowski wrote:
>>>> On 11.05.2015 10:26, Dan Carpenter wrote:
>> (...)
>>>>>
>>>>> Which part isn't aligned?  I think they both are.
>>>>>
>>>> struct rtllib_rxb *prxb = prxbIndicateArray[j];
>>>>
>>>> struct rtllib_rxb {
>>>> 	u8 nr_subframes;
>>>> 	struct sk_buff *subframes[MAX_SUBFRAME_COUNT == 64];
>>>> 	u8 dst[ETH_ALEN]; // here
>>>> 	u8 src[ETH_ALEN]; // here
>>>> } __packed;
(...)
> 
> I'm not positive it's "by design" though, this is staging code so maybe
> they just added __packed to every struct.  In fact, I'm pretty sure
> unaligned pointers don't work on some arches so the __packed is probably
> a bug.
> 

I doubt anyone uses it on anything else than some low cost x86 netbooks. 

I removed __packed and did a small test today (download 10mb of garbage, check md5)
- it doesn't seem to affect driver (on staging-testing, without this patchset).

Nevertheless I would prefer to leave it like that for this patch set if it's
OK with you and perhaps include it for next series I'll work on.

Regards,
Mateusz

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