linux-kernel - Re: [PATCH]bluetooth: hci_sysfs connection bus

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Date:	Thu, 1 Nov 2007 09:05:14 +0800
From:	"Dave Young" <hidave.darkstar@...il.com>
To:	"Marcel Holtmann" <marcel@...tmann.org>
Cc:	"David Miller" <davem@...emloft.net>, linux-kernel@...r.kernel.org,
	bluez-devel@...ts.sourceforge.net
Subject: Re: [PATCH]bluetooth: hci_sysfs connection bus_id add support for diffrent hci device

On 10/31/07, Marcel Holtmann <marcel@...tmann.org> wrote:
> Hi Dave,
>
> > > > > diff -upr linux/net/bluetooth/hci_sysfs.c linux.new/net/bluetooth/hci_sysfs.c
> > > > > --- linux/net/bluetooth/hci_sysfs.c 2007-10-31 10:21:00.000000000 +0800
> > > > > +++ linux.new/net/bluetooth/hci_sysfs.c     2007-10-31 10:21:55.000000000 +0800
> > > > > @@ -302,7 +302,8 @@ void hci_conn_add_sysfs(struct hci_conn
> > > > >     conn->dev.release = bt_release;
> > > > >
> > > > >     snprintf(conn->dev.bus_id, BUS_ID_SIZE,
> > > > > -                   "%s%2.2X%2.2X%2.2X%2.2X%2.2X%2.2X",
> > > > > +                   "%s%s%2.2X%2.2X%2.2X%2.2X%2.2X%2.2X",
> > > > > +                   hdev->name,
> > > > >                     conn->type == ACL_LINK ? "acl" : "sco",
> > > > >                     ba->b[5], ba->b[4], ba->b[3],
> > > > >                     ba->b[2], ba->b[1], ba->b[0]);
> > > >
> > > > This might not work.
> > > >
> > > > Your device's name is already 15 characters long,
> > > > BUS_ID_SIZE is 20, and it seems hdev->name could
> > > > easily overflow the 4 or 5 characters of space
> > > > remaining.
> > >
> > > and should also be not needed since their parents are different. However
> > > we had to add the connections to a bus. Otherwise the userspace will
> > > never see them. I have to think about the right solution for this
> > > problem.
> >
> > Maybe we can use this instead:
> >       snprintf(conn->dev.bus_id, BUS_ID_SIZE,
> > -                     "%s%2.2X%2.2X%2.2X%2.2X%2.2X%2.2X",
> > +                     "%s%s%2.2X%2.2X%2.2X%2.2X%2.2X%2.2X",
> > +                     hdev->name + 3,
> >                       conn->type == ACL_LINK ? "acl" : "sco",
> >                       ba->b[5], ba->b[4], ba->b[3],
> >                       ba->b[2], ba->b[1], ba->b[0]);
>
> I had a look on how other subsystems handle this case and yes, they
> duplicate the id number from its parent device. So I applied the
> attached patch to my tree.
Thanks.
>
> The best would be to use '"%d-%d", hdev->id, conn->handle', but at the
> time we create the hci_conn structure and add the sysfs entry the
> connection handle is not know yet. I have to look into that and see if
> that can be changed.
I agree. I wonder to  know whether the conn sys issue can be delayed
after the handle is availible.

Regards
dave
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