Since commit 3e54c5890c87 ("Bluetooth: hci_event: Use of a function table to handle HCI events"),
some devices see warnings being printed for vendor events, e.g.
[ 75.806141] Bluetooth: hci0: setting up wcn399x
[ 75.948311] Bluetooth: hci0: unexpected event 0xff length: 14 > 0
[ 75.955552] Bluetooth: hci0: QCA Product ID :0x0000000a
[ 75.961369] Bluetooth: hci0: QCA SOC Version :0x40010214
[ 75.967417] Bluetooth: hci0: QCA ROM Version :0x00000201
[ 75.973363] Bluetooth: hci0: QCA Patch Version:0x00000001
[ 76.000289] Bluetooth: hci0: QCA controller version 0x02140201
[ 76.006727] Bluetooth: hci0: QCA Downloading qca/crbtfw21.tlv
[ 76.986850] Bluetooth: hci0: unexpected event 0xff length: 3 > 0
[ 77.013574] Bluetooth: hci0: QCA Downloading qca/oneplus6/crnv21.bin
[ 77.024302] Bluetooth: hci0: unexpected event 0xff length: 3 > 0
[ 77.032681] Bluetooth: hci0: unexpected event 0xff length: 3 > 0
[ 77.040674] Bluetooth: hci0: unexpected event 0xff length: 3 > 0
[ 77.049251] Bluetooth: hci0: unexpected event 0xff length: 3 > 0
[ 77.057997] Bluetooth: hci0: unexpected event 0xff length: 3 > 0
[ 77.066320] Bluetooth: hci0: unexpected event 0xff length: 3 > 0
[ 77.075065] Bluetooth: hci0: unexpected event 0xff length: 3 > 0
[ 77.083073] Bluetooth: hci0: unexpected event 0xff length: 3 > 0
[ 77.091250] Bluetooth: hci0: unexpected event 0xff length: 3 > 0
[ 77.099417] Bluetooth: hci0: unexpected event 0xff length: 3 > 0
[ 77.110166] Bluetooth: hci0: unexpected event 0xff length: 3 > 0
[ 77.118672] Bluetooth: hci0: unexpected event 0xff length: 3 > 0
[ 77.127449] Bluetooth: hci0: unexpected event 0xff length: 3 > 0
[ 77.137190] Bluetooth: hci0: unexpected event 0xff length: 3 > 0
[ 77.146192] Bluetooth: hci0: unexpected event 0xff length: 3 > 0
[ 77.154242] Bluetooth: hci0: unexpected event 0xff length: 3 > 0
[ 77.163183] Bluetooth: hci0: unexpected event 0xff length: 3 > 0
[ 77.171202] Bluetooth: hci0: unexpected event 0xff length: 3 > 0
[ 77.179364] Bluetooth: hci0: unexpected event 0xff length: 3 > 0
[ 77.187259] Bluetooth: hci0: unexpected event 0xff length: 3 > 0
[ 77.198451] Bluetooth: hci0: QCA setup on UART is completed
Avoid printing the event length warning for vendor events, this reverts
to the previous behaviour where such warnings weren't printed.
Fixes: 3e54c5890c87 ("Bluetooth: hci_event: Use of a function table to handle HCI events")
Signed-off-by: Caleb Connolly <[email protected]>
---
Changes since v1:
* Don't return early! Vendor events still get parsed despite the
warning. I should have looked a little more closely at that...
---
net/bluetooth/hci_event.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
index fc30f4c03d29..9b7c9ab77971 100644
--- a/net/bluetooth/hci_event.c
+++ b/net/bluetooth/hci_event.c
@@ -6822,7 +6822,7 @@ static void hci_event_func(struct hci_dev *hdev, u8 event, struct sk_buff *skb,
* possible to partially parse the event so leave to callback to
* decide if that is acceptable.
*/
- if (skb->len > ev->max_len)
+ if (skb->len > ev->max_len && event != HCI_EV_VENDOR)
bt_dev_warn(hdev, "unexpected event 0x%2.2x length: %u > %u",
event, skb->len, ev->max_len);
--
2.35.1
Hi Caleb,
> Since commit 3e54c5890c87 ("Bluetooth: hci_event: Use of a function table to handle HCI events"),
> some devices see warnings being printed for vendor events, e.g.
>
> [ 75.806141] Bluetooth: hci0: setting up wcn399x
> [ 75.948311] Bluetooth: hci0: unexpected event 0xff length: 14 > 0
> [ 75.955552] Bluetooth: hci0: QCA Product ID :0x0000000a
> [ 75.961369] Bluetooth: hci0: QCA SOC Version :0x40010214
> [ 75.967417] Bluetooth: hci0: QCA ROM Version :0x00000201
> [ 75.973363] Bluetooth: hci0: QCA Patch Version:0x00000001
> [ 76.000289] Bluetooth: hci0: QCA controller version 0x02140201
> [ 76.006727] Bluetooth: hci0: QCA Downloading qca/crbtfw21.tlv
> [ 76.986850] Bluetooth: hci0: unexpected event 0xff length: 3 > 0
> [ 77.013574] Bluetooth: hci0: QCA Downloading qca/oneplus6/crnv21.bin
> [ 77.024302] Bluetooth: hci0: unexpected event 0xff length: 3 > 0
> [ 77.032681] Bluetooth: hci0: unexpected event 0xff length: 3 > 0
> [ 77.040674] Bluetooth: hci0: unexpected event 0xff length: 3 > 0
> [ 77.049251] Bluetooth: hci0: unexpected event 0xff length: 3 > 0
> [ 77.057997] Bluetooth: hci0: unexpected event 0xff length: 3 > 0
> [ 77.066320] Bluetooth: hci0: unexpected event 0xff length: 3 > 0
> [ 77.075065] Bluetooth: hci0: unexpected event 0xff length: 3 > 0
> [ 77.083073] Bluetooth: hci0: unexpected event 0xff length: 3 > 0
> [ 77.091250] Bluetooth: hci0: unexpected event 0xff length: 3 > 0
> [ 77.099417] Bluetooth: hci0: unexpected event 0xff length: 3 > 0
> [ 77.110166] Bluetooth: hci0: unexpected event 0xff length: 3 > 0
> [ 77.118672] Bluetooth: hci0: unexpected event 0xff length: 3 > 0
> [ 77.127449] Bluetooth: hci0: unexpected event 0xff length: 3 > 0
> [ 77.137190] Bluetooth: hci0: unexpected event 0xff length: 3 > 0
> [ 77.146192] Bluetooth: hci0: unexpected event 0xff length: 3 > 0
> [ 77.154242] Bluetooth: hci0: unexpected event 0xff length: 3 > 0
> [ 77.163183] Bluetooth: hci0: unexpected event 0xff length: 3 > 0
> [ 77.171202] Bluetooth: hci0: unexpected event 0xff length: 3 > 0
> [ 77.179364] Bluetooth: hci0: unexpected event 0xff length: 3 > 0
> [ 77.187259] Bluetooth: hci0: unexpected event 0xff length: 3 > 0
> [ 77.198451] Bluetooth: hci0: QCA setup on UART is completed
>
> Avoid printing the event length warning for vendor events, this reverts
> to the previous behaviour where such warnings weren't printed.
>
> Fixes: 3e54c5890c87 ("Bluetooth: hci_event: Use of a function table to handle HCI events")
> Signed-off-by: Caleb Connolly <[email protected]>
> ---
> Changes since v1:
> * Don't return early! Vendor events still get parsed despite the
> warning. I should have looked a little more closely at that...
> ---
> net/bluetooth/hci_event.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
patch has been applied to bluetooth-stable tree.
Regards
Marcel
Hi Marcel, Caleb,
On Wed, Mar 2, 2022 at 11:20 AM Marcel Holtmann <[email protected]> wrote:
>
> Hi Caleb,
>
> > Since commit 3e54c5890c87 ("Bluetooth: hci_event: Use of a function table to handle HCI events"),
> > some devices see warnings being printed for vendor events, e.g.
> >
> > [ 75.806141] Bluetooth: hci0: setting up wcn399x
> > [ 75.948311] Bluetooth: hci0: unexpected event 0xff length: 14 > 0
> > [ 75.955552] Bluetooth: hci0: QCA Product ID :0x0000000a
> > [ 75.961369] Bluetooth: hci0: QCA SOC Version :0x40010214
> > [ 75.967417] Bluetooth: hci0: QCA ROM Version :0x00000201
> > [ 75.973363] Bluetooth: hci0: QCA Patch Version:0x00000001
> > [ 76.000289] Bluetooth: hci0: QCA controller version 0x02140201
> > [ 76.006727] Bluetooth: hci0: QCA Downloading qca/crbtfw21.tlv
> > [ 76.986850] Bluetooth: hci0: unexpected event 0xff length: 3 > 0
> > [ 77.013574] Bluetooth: hci0: QCA Downloading qca/oneplus6/crnv21.bin
> > [ 77.024302] Bluetooth: hci0: unexpected event 0xff length: 3 > 0
> > [ 77.032681] Bluetooth: hci0: unexpected event 0xff length: 3 > 0
> > [ 77.040674] Bluetooth: hci0: unexpected event 0xff length: 3 > 0
> > [ 77.049251] Bluetooth: hci0: unexpected event 0xff length: 3 > 0
> > [ 77.057997] Bluetooth: hci0: unexpected event 0xff length: 3 > 0
> > [ 77.066320] Bluetooth: hci0: unexpected event 0xff length: 3 > 0
> > [ 77.075065] Bluetooth: hci0: unexpected event 0xff length: 3 > 0
> > [ 77.083073] Bluetooth: hci0: unexpected event 0xff length: 3 > 0
> > [ 77.091250] Bluetooth: hci0: unexpected event 0xff length: 3 > 0
> > [ 77.099417] Bluetooth: hci0: unexpected event 0xff length: 3 > 0
> > [ 77.110166] Bluetooth: hci0: unexpected event 0xff length: 3 > 0
> > [ 77.118672] Bluetooth: hci0: unexpected event 0xff length: 3 > 0
> > [ 77.127449] Bluetooth: hci0: unexpected event 0xff length: 3 > 0
> > [ 77.137190] Bluetooth: hci0: unexpected event 0xff length: 3 > 0
> > [ 77.146192] Bluetooth: hci0: unexpected event 0xff length: 3 > 0
> > [ 77.154242] Bluetooth: hci0: unexpected event 0xff length: 3 > 0
> > [ 77.163183] Bluetooth: hci0: unexpected event 0xff length: 3 > 0
> > [ 77.171202] Bluetooth: hci0: unexpected event 0xff length: 3 > 0
> > [ 77.179364] Bluetooth: hci0: unexpected event 0xff length: 3 > 0
> > [ 77.187259] Bluetooth: hci0: unexpected event 0xff length: 3 > 0
> > [ 77.198451] Bluetooth: hci0: QCA setup on UART is completed
> >
> > Avoid printing the event length warning for vendor events, this reverts
> > to the previous behaviour where such warnings weren't printed.
> >
> > Fixes: 3e54c5890c87 ("Bluetooth: hci_event: Use of a function table to handle HCI events")
> > Signed-off-by: Caleb Connolly <[email protected]>
> > ---
> > Changes since v1:
> > * Don't return early! Vendor events still get parsed despite the
> > warning. I should have looked a little more closely at that...
> > ---
> > net/bluetooth/hci_event.c | 2 +-
> > 1 file changed, 1 insertion(+), 1 deletion(-)
>
> patch has been applied to bluetooth-stable tree.
>
> Regards
>
> Marcel
I believe a proper fix has already been pushed to bluetooth-next:
https://git.kernel.org/pub/scm/linux/kernel/git/bluetooth/bluetooth-next.git/commit/?id=314d8cd2787418c5ac6b02035c344644f47b292b
HCI_EV_VENDOR shall be assumed to be variable length and that also
uses bt_dev_warn_ratelimited to avoid spamming the logs in case it
still fails.
--
Luiz Augusto von Dentz