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uwb: fix channel change failure

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Make the transition to the UWB_RSV_STATE_NONE state synchronous so that
there is not a race between uwb_rsv_terminate and uwb_rsv_establish.
uwb_rsv_terminate would set the rsv->state to UWB_RSV_STATE_NONE but did
not release the stream resource until a 320ms timeout had expired.  If a
user called uwb_rsv_establish during that time, it could fail to
establish the reservation because no stream resources were available.
This patch removes the timer from the uwb_rsv_terminate process since it
is not needed when transitioning to UWB_RSV_STATE_NONE.

Signed-off-by: Thomas Pugliese <thomas.pugliese@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Thomas Pugliese 2014-04-25 10:30:32 -05:00 committed by Greg Kroah-Hartman
parent bae00c1ac3
commit 90ec00d54e
1 changed files with 6 additions and 1 deletions
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7
drivers/uwb/rsv.c
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@ -249,7 +249,9 @@ static void uwb_rsv_stroke_timer(struct uwb_rsv *rsv)
* super frame and should not be terminated if no response is
* received.
*/
if (rsv->is_multicast) {
if (rsv->state == UWB_RSV_STATE_NONE) {
sframes = 0;
} else if (rsv->is_multicast) {
if (rsv->state == UWB_RSV_STATE_O_INITIATED
|| rsv->state == UWB_RSV_STATE_O_MOVE_EXPANDING
|| rsv->state == UWB_RSV_STATE_O_MOVE_COMBINING
@ -322,6 +324,7 @@ void uwb_rsv_set_state(struct uwb_rsv *rsv, enum uwb_rsv_state new_state)
switch (new_state) {
case UWB_RSV_STATE_NONE:
uwb_rsv_state_update(rsv, UWB_RSV_STATE_NONE);
uwb_rsv_remove(rsv);
uwb_rsv_callback(rsv);
break;
case UWB_RSV_STATE_O_INITIATED:
@ -442,6 +445,8 @@ static void uwb_rsv_handle_timeout_work(struct work_struct *work)
uwb_rsv_set_state(rsv, UWB_RSV_STATE_T_ACCEPTED);
uwb_drp_avail_release(rsv->rc, &rsv->mv.companion_mas);
goto unlock;
case UWB_RSV_STATE_NONE:
goto unlock;
default:
break;
}