On Fri, Mar 18, 2016 at 10:13:34AM -0400, Alan Stern wrote:
> On Thu, 17 Mar 2016, Nicolai Stange wrote:
>
> > With commit 69bec7259853 ("USB: core: let USB device know device node"),
> > the port1 argument of usb_alloc_dev() gets overwritten as follows:
> >
> > ... usb_alloc_dev(..., unsigned port1)
> > {
> > ...
> > if (!parent->parent) {
> > port1 = usb_hcd_find_raw_port_number(..., port1);
> > }
> > ...
> > }
> >
> > Later on, this now overwritten port1 gets assigned to ->portnum:
> >
> > dev->portnum = port1;
> >
> > However, since xhci_find_raw_port_number() isn't idempotent, the
> > aforementioned commit causes a number of KASAN splats like the following:
>
> ...
>
> > Fix this by not overwriting the port1 argument in usb_alloc_dev(), but
> > storing the raw port number as required by OF in an additional variable,
> > raw_port.
> >
> > Fixes: 69bec7259853 ("USB: core: let USB device know device node")
> > Signed-off-by: Nicolai Stange
> > ---
> > Applicable to linux-next-20160317
> >
> > Changes to v1:
> > - Initialize raw_port with port1
>
> Acked-by: Alan Stern
>
Thanks for fixing it in time, you are right. My patch would let the
device logical port number equals to device raw port number, but it
is wrong for xhci.
--
Best Regards,
Peter Chen
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