From: Andrzej Pietrasiewicz
> Sent: 02 July 2014 12:20
> To: [email protected]; Michal Nazarewicz; Felipe Balbi; Greg
> Kroah-Hartman; Marek Szyprowski
> Subject: Re: [PATCH] usb: gadget: f_fs: OS descriptors support
>
> W dniu 02.07.2014 13:04, Peter Stuge pisze:
> > Andrzej Pietrasiewicz wrote:
> >> +++ b/include/uapi/linux/usb/functionfs.h
> >> @@ -33,6 +32,42 @@ struct usb_endpoint_descriptor_no_audio {
> > ..
> >> +/* MS OS Extended Compatibility Descriptor header */
> >> +struct usb_ext_compat_desc_header {
> >> + struct usb_os_desc_header header;
> >> + __u8 bCount;
> >> + __u8 Reserved;
> >> +} __attribute__((packed));
> >> +
> >> +struct usb_ext_compat_desc {
> >> + __u8 bFirstInterfaceNumber;
> >> + __u8 Reserved1;
> >> + __u8 CompatibleID[8];
> >> + __u8 SubCompatibleID[8];
> >> + __u8 Reserved2[6];
> >> +};
> >
> > Shouldn't usb_ext_compat_desc be packed too, like all the others?
> >
> Good catch, thanks!
In this case it is completely pointless - all the fields are byte aligned.
Alternatively it shouldn't be 'packed', and a full audit of the
other structures done to determine which ones can ever be misaligned
and then determine whether that should actually be allowed.
David
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