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: <200805151036.09386.oliver@neukum.org>
Date:	Thu, 15 May 2008 10:36:08 +0200
From:	Oliver Neukum <oliver@...kum.org>
To:	Jie Zhang <jie.zhang@...log.com>
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.

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.

	Regards
		Oliver
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