[RFC] Bluetooth: Do not attempt to send dlci disconnect when in BT_CONFIG.

From: Nick Pelly <npelly@google.com>

Do not attempt to send dlci disconnect when in BT_CONFIG.

This fixes a bug where shutdown() and close() on a rfcomm socket during ACL
connection would not cause HCI Create Connection Cancel.

This is one of the number of patches from the Android AOSP common.git tree,
which is used on almost all Android devices.  so I wanted to submit it for
review to see if it should go upstream.

Cc: Marcel Holtmann <marcel@holtmann.org>
Cc: Gustavo Padovan <gustavo@padovan.org>
Cc: Johan Hedberg <johan.hedberg@gmail.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Peter Hurley <peter@hurleysoftware.com>
Cc: Seung-Woo Kim <sw0312.kim@samsung.com>
Cc: Nick Pelly <npelly@google.com>
Cc: linux-bluetooth@vger.kernel.org
Cc: netdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: Android Kernel Team <kernel-team@android.com>
Cc: John Stultz <john.stultz@linaro.org>
Signed-off-by: Nick Pelly <npelly@google.com>
[kiran: Added context to commit message]
Signed-off-by: Kiran Raparthy <kiran.kumar@linaro.org>
---
 net/bluetooth/rfcomm/core.c | 1 -
 1 file changed, 1 deletion(-)

Hi Kiran,

> Do not attempt to send dlci disconnect when in BT_CONFIG.
> 
> This fixes a bug where shutdown() and close() on a rfcomm socket during ACL
> connection would not cause HCI Create Connection Cancel.
> 
> This is one of the number of patches from the Android AOSP common.git tree,
> which is used on almost all Android devices.  so I wanted to submit it for
> review to see if it should go upstream.
> 
> Cc: Marcel Holtmann <marcel@holtmann.org>
> Cc: Gustavo Padovan <gustavo@padovan.org>
> Cc: Johan Hedberg <johan.hedberg@gmail.com>
> Cc: David S. Miller <davem@davemloft.net>
> Cc: Peter Hurley <peter@hurleysoftware.com>
> Cc: Seung-Woo Kim <sw0312.kim@samsung.com>
> Cc: Nick Pelly <npelly@google.com>
> Cc: linux-bluetooth@vger.kernel.org
> Cc: netdev@vger.kernel.org
> Cc: linux-kernel@vger.kernel.org
> Cc: Android Kernel Team <kernel-team@android.com>
> Cc: John Stultz <john.stultz@linaro.org>
> Signed-off-by: Nick Pelly <npelly@google.com>
> [kiran: Added context to commit message]
> Signed-off-by: Kiran Raparthy <kiran.kumar@linaro.org>
> ---
> net/bluetooth/rfcomm/core.c | 1 -
> 1 file changed, 1 deletion(-)
> 
> diff --git a/net/bluetooth/rfcomm/core.c b/net/bluetooth/rfcomm/core.c
> index cf62026..6a531e7 100644
> --- a/net/bluetooth/rfcomm/core.c
> +++ b/net/bluetooth/rfcomm/core.c
> @@ -456,7 +456,6 @@ static int __rfcomm_dlc_close(struct rfcomm_dlc *d, int err)
> 
> 	switch (d->state) {
> 	case BT_CONNECT:
> -	case BT_CONFIG:
> 	case BT_OPEN:
> 	case BT_CONNECT2:
> 		if (test_and_clear_bit(RFCOMM_DEFER_SETUP, &d->flags)) {

you can include traces and a test program that will demonstrate this behavior. I am hearing about this one for the first time. Nobody else has indicated an issue like this before.

Regards

Marcel

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