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

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Date:	Fri, 26 Jun 2015 12:03:47 +0200
From:	Jörg Otte <jrg.otte@...il.com>
To:	Marcel Holtmann <marcel@...tmann.org>
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.

2015-06-26 11:37 GMT+02:00 Marcel Holtmann <marcel@...tmann.org>:
> 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?
>
I will check this when I am at home in the
afternoon.

Thanks, Jörg
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