tree 7a47b0b80be4222494b272846ad5233f0d04c6e6
parent 9f2c8a03fbb3048cf38b158f87aa0c3c09bca084
author Marcel Holtmann <marcel@holtmann.org> 1232090271 +0100
committer Marcel Holtmann <marcel@holtmann.org> 1235711673 +0100

Bluetooth: Pause RFCOMM TX when encryption drops

A role switch with devices following the Bluetooth pre-2.1 standards
or without Encryption Pause and Resume support is not possible if
encryption is enabled. Most newer headsets require the role switch,
but also require that the connection is encrypted.

For connections with a high security mode setting, the link will be
immediately dropped. When the connection uses medium security mode
setting, then a grace period is introduced where the TX is halted and
the remote device gets a change to re-enable encryption after the
role switch. If not re-enabled the link will be dropped.

Based on initial work by Ville Tervo <ville.tervo@nokia.com>

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>