Re: [bluetooth] linux-3.x regression (bisected)
From: Gustavo Padovan
Date: Wed Dec 28 2011 - 11:16:33 EST
* David Herrmann <dh.herrmann@xxxxxxxxxxxxxx> [2011-12-28 17:04:11 +0100]:
> On Wed, Dec 28, 2011 at 4:52 PM, Gustavo Padovan <padovan@xxxxxxxxxxxxxx> wrote:
> > I think this patch can do handling, let's see what others think.
> > Gustavo
> > ---
> > Author: Gustavo F. Padovan <padovan@xxxxxxxxxxxxxx>
> > Date: Wed Dec 28 13:40:02 2011 -0200
> > Bluetooth: Fix lmp_host_le_capable() check for broken devices
> > Some dongles reports a wrong Local Extended Features leading the kernel
> > think that dongle support LE while it don't.
> > The fix here is just rely on a bit in Local Features (LE Capable) to tell
> > us if the device really supports LE.
> > LE Host Capable is the only bit used from Local Extended Features in our
> > kernel.
> > Signed-off-by: Gustavo F. Padovan <padovan@xxxxxxxxxxxxxx>
> > diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
> > index 5e2e984..c693111 100644
> > --- a/include/net/bluetooth/hci_core.h
> > +++ b/include/net/bluetooth/hci_core.h
> > @@ -676,7 +676,11 @@ void hci_conn_del_sysfs(struct hci_conn *conn);
> > #define lmp_le_capable(dev) ((dev)->features & LMP_LE)
> > /* ----- Extended LMP capabilities ----- */
> > -#define lmp_host_le_capable(dev) ((dev)->extfeatures & LMP_HOST_LE)
> > +/* Some crap dongles does not report a proper Local Extended Features causing
> > + * the kernel to wrongly init it as a LE device. So first check if it is LE
> > + * capable (controller) which is a info from the Local Features */
> > +#define lmp_host_le_capable(dev) ( lmp_le_capable(dev) && \
> > + (dev)->extfeatures & LMP_HOST_LE)
> > /* ----- HCI protocols ----- */
> > static inline int hci_proto_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr,
> Next time we use the extfeatures for something else, we will break
> this device again. Can't we fix dev->extfeatures on initialization
> based on a blacklist/quirklist? Or is dev->extfeatures modified after
> initialzation of the device somewhere?
Sure, we will, but I don't see us using another bit of extfeatures in the near
future (after the next Core Spec release maybe) and I don't wanna got that far
in this fix right now.
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