Hi Marcel -
On Thu, 17 May 2012, Marcel Holtmann wrote:
Hi Mat,
This fixes a regression from commit
2ead70b8390d199ca04cd35311b51f5f3676079e that is present in all
kernels starting at v3.0.
When L2CAP information was moved to struct l2cap_chan, a check was
added to l2cap_chan_del to avoid certain cleanup operations when ERTM
or streaming mode had not yet been initialized. The logic in the
check did not take in to account that chan->conf_state is set to 0 in
l2cap_chan_ready, so l2cap_chan_del failed to cancel timers and leaked
memory any time the ERTM queues or lists were not empty.
This change makes sure that l2cap_chan_del only returns early if
ERTM initialization was not performed.
Signed-off-by: Mat Martineau <mathewm@xxxxxxxxxxxxxx>
---
include/net/bluetooth/l2cap.h | 1 +
net/bluetooth/l2cap_core.c | 4 ++--
2 files changed, 3 insertions(+), 2 deletions(-)
diff --git a/include/net/bluetooth/l2cap.h b/include/net/bluetooth/l2cap.h
index 1c7d1cd..452fcc4 100644
--- a/include/net/bluetooth/l2cap.h
+++ b/include/net/bluetooth/l2cap.h
@@ -597,6 +597,7 @@ enum {
CONF_EWS_RECV,
CONF_LOC_CONF_PEND,
CONF_REM_CONF_PEND,
+ CONF_NOT_COMPLETE,
};
#define L2CAP_CONF_MAX_CONF_REQ 2
diff --git a/net/bluetooth/l2cap_core.c b/net/bluetooth/l2cap_core.c
index 24f144b..36edd42 100644
--- a/net/bluetooth/l2cap_core.c
+++ b/net/bluetooth/l2cap_core.c
@@ -391,6 +391,7 @@ struct l2cap_chan *l2cap_chan_create(void)
chan->state = BT_OPEN;
atomic_set(&chan->refcnt, 1);
+ set_bit(CONF_NOT_COMPLETE, &chan->conf_state);
BT_DBG("chan %p", chan);
@@ -509,8 +510,7 @@ static void l2cap_chan_del(struct l2cap_chan *chan, int err)
release_sock(sk);
- if (!(test_bit(CONF_OUTPUT_DONE, &chan->conf_state) &&
- test_bit(CONF_INPUT_DONE, &chan->conf_state)))
+ if (test_bit(CONF_NOT_COMPLETE, &chan->conf_state))
return;
explain to me how this works? We never clear that bit.
Line 926 in l2cap_chan_ready (called after configuration is done) is
existing code that I didn't change:
chan->conf_state = 0;
So all bits are cleared at once, including CONF_NOT_COMPLETE.
--
Mat Martineau
Employee of Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum
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