linux-kernel - Re: [PATCH 1/1] [usb/host]: use get/put_unaligned_* helpers to fix more potential unaligned issues.

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Message-ID: <482BFF2C.4090506@analog.com>
Date:	Thu, 15 May 2008 17:15:24 +0800
From:	Jie Zhang <jie.zhang@...log.com>
To:	Oliver Neukum <oliver@...kum.org>
CC:	Bryan Wu <cooloney@...nel.org>, harvey.harrison@...il.com,
	david-b@...bell.net, greg@...ah.com, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] [usb/host]: use get/put_unaligned_* helpers to fix
 more potential unaligned issues.

Oliver Neukum wrote:
> Am Donnerstag 15 Mai 2008 10:03:35 schrieb Jie Zhang:
>> Oliver Neukum wrote:
>>> Am Donnerstag 15 Mai 2008 08:19:24 schrieb Bryan Wu:
>>>> --- a/drivers/usb/host/uhci-hub.c
>>>> +++ b/drivers/usb/host/uhci-hub.c
>>>> @@ -253,7 +253,7 @@ static int uhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
>>>>         switch (typeReq) {
>>>>  
>>>>         case GetHubStatus:
>>>> -               *(__le32 *)buf = cpu_to_le32(0);
>>>> +               put_unaligned_le32(0, buf);
>>> What is supposed to make all these changes a good idea?
>>>
>> Since buf might not be 4-byte aligned.
> 
> It is. Please analyze the code before you use these access methods.
> 
You are right. buf has been 4-byte aligned since 2.6.19. My patch was 
written two years ago. Sorry for the noise I caused.


Jie
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