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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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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