Re: [PATCH 4.9 02/31] Bluetooth: hci_ldisc: Postpone HCI_UART_PROTO_READY bit set in hci_uart_set_proto()

From: Ralph Siemsen
Date: Mon Nov 18 2019 - 15:27:18 EST

On Sat, Nov 16, 2019 at 03:56:14PM +0800, Greg Kroah-Hartman wrote:

BTW, this also seems to be missing from 4.4 branch, although it was merged
for 3.16 (per

Odd that it was merged into 3.16, perhaps it was done there because some
earlier patch added the problem?

This patch should really be viewed as a correction to an earlier commit:
84cb3df02aea ("Bluetooth: hci_ldisc: Fix null pointer derefence in case of early data"). This was merged 2016-Apr-08 into v4.7, and therefore is included in 4.9 and higher.

Only very recently, on 2019-Sep-23, this was backported to 3.16, along with the correction. Both appeared in v3.16.74.

I say this as I do not think this is
relevant for the 4.4.y kernel, do you? Have you tried to apply this
patch there?

The patch does not apply, but this is mainly due to the earlier commit missing. It seems to me like that earlier fix is desirable (and it was put into 3.16), along with the followup. So I would think we want it in 4.4 as well.

[Aside: I'm really only interested in 4.9 and 4.19, so the 4.4 stuff is just a diversion. But figured I might as well mention what I found...]