linux-kernel - Re: [4.1.0-07254-gc13c810] Regression: Bluetooth not working.

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Date:	Fri, 26 Jun 2015 11:37:37 +0200
From:	Marcel Holtmann <marcel@...tmann.org>
To:	Jörg Otte <jrg.otte@...il.com>
Cc:	Alexey Dobriyan <adobriyan@...il.com>,
	Johan Hedberg <johan.hedberg@...il.com>,
	"bluez mailin list (linux-bluetooth@...r.kernel.org)" 
	<linux-bluetooth@...r.kernel.org>,
	inux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [4.1.0-07254-gc13c810] Regression: Bluetooth not working.

Hi Joerg,

> Bluetooth is inoperable in current Linus tree and the
> first bad commit is:
> 
> 835a6a2f8603237a3e6cded5a6765090ecb06ea5 is the first bad commit
> commit 835a6a2f8603237a3e6cded5a6765090ecb06ea5
> Author: Alexey Dobriyan <adobriyan@...il.com>
> Date:   Wed Jun 10 20:28:33 2015 +0300
> 
>    Bluetooth: Stop sabotaging list poisoning
> 
>    list_del() poisons pointers with special values, no need to overwrite them.
> 
>    Signed-off-by: Alexey Dobriyan <adobriyan@...il.com>
>    Signed-off-by: Marcel Holtmann <marcel@...tmann.org>
> 
> My BT adapter is an intel 8087:07da
> I reverted that commit and this fixed the problem for me.

today we had a patch from Tedd fixing the list initialization in the HIDP code.

diff --git a/net/bluetooth/hidp/core.c b/net/bluetooth/hidp/core.c
index 9070dfd6b4ad..f1a117f8cad2 100644
--- a/net/bluetooth/hidp/core.c
+++ b/net/bluetooth/hidp/core.c
@@ -915,6 +915,7 @@ static int hidp_session_new(struct hidp_session **out, const bdaddr_t *bdaddr,
        session->conn = l2cap_conn_get(conn);
        session->user.probe = hidp_session_probe;
        session->user.remove = hidp_session_remove;
+       INIT_LIST_HEAD(&session->user.list);
        session->ctrl_sock = ctrl_sock;
        session->intr_sock = intr_sock;
        skb_queue_head_init(&session->ctrl_transmit);

Could this be fixing it for you as well?

Regards

Marcel

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