Hi,
This patch set converts the LTK and IRK lists to use RCU which
eliminates the need to always hold the hdev lock while accessing these
lists. This helps us fix more lockdep warnings arising from hdev locking
in smp.c.
What this patch set doesn't fix is the general problem of the SMP
context holding references to list entries without any guarantee that
those references stay valid if some other thread goes and removes the
entries. For this the proper fix would probably be to introduce kref for
the entries to ensure that external references stay valid. However,
since that requires considerably more code it's better to first merge
most lists into a single "remote device info" list that's protected both
by kref and RCU.
Johan
----------------------------------------------------------------
Johan Hedberg (4):
Bluetooth: Convert LTK list to RCU
Bluetooth: Convert IRK list to RCU
Bluetooth: Remove unnecessary hdev locking in smp.c
Bluetooth: Add debug logs to help track locking issues
include/net/bluetooth/hci_core.h | 2 +
net/bluetooth/hci_core.c | 88 ++++++++++++++++++++++----------------
net/bluetooth/hci_event.c | 4 +-
net/bluetooth/l2cap_core.c | 3 +-
net/bluetooth/l2cap_sock.c | 10 ++++-
net/bluetooth/smp.c | 27 ++++--------
6 files changed, 75 insertions(+), 59 deletions(-)
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