| From | Ben Hutchings <> | Date | Fri, 10 Mar 2017 11:46:10 +0000 | Subject | [PATCH 3.2 129/199] can: bcm: fix hrtimer/tasklet termination in bcm op removal |
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3.2.87-rc1 review patch. If anyone has any objections, please let me know.
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From: Oliver Hartkopp <socketcan@hartkopp.net>
commit a06393ed03167771246c4c43192d9c264bc48412 upstream.
When removing a bcm tx operation either a hrtimer or a tasklet might run. As the hrtimer triggers its associated tasklet and vice versa we need to take care to mutually terminate both handlers.
Reported-by: Michael Josenhans <michael.josenhans@web.de> Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net> Tested-by: Michael Josenhans <michael.josenhans@web.de> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de> Signed-off-by: Ben Hutchings <ben@decadent.org.uk> --- net/can/bcm.c | 23 ++++++++++++++++------- 1 file changed, 16 insertions(+), 7 deletions(-)
--- a/net/can/bcm.c +++ b/net/can/bcm.c @@ -702,14 +702,23 @@ static struct bcm_op *bcm_find_op(struct static void bcm_remove_op(struct bcm_op *op) { - hrtimer_cancel(&op->timer); - hrtimer_cancel(&op->thrtimer); + if (op->tsklet.func) { + while (test_bit(TASKLET_STATE_SCHED, &op->tsklet.state) || + test_bit(TASKLET_STATE_RUN, &op->tsklet.state) || + hrtimer_active(&op->timer)) { + hrtimer_cancel(&op->timer); + tasklet_kill(&op->tsklet); + } + } - if (op->tsklet.func) - tasklet_kill(&op->tsklet); - - if (op->thrtsklet.func) - tasklet_kill(&op->thrtsklet); + if (op->thrtsklet.func) { + while (test_bit(TASKLET_STATE_SCHED, &op->thrtsklet.state) || + test_bit(TASKLET_STATE_RUN, &op->thrtsklet.state) || + hrtimer_active(&op->thrtimer)) { + hrtimer_cancel(&op->thrtimer); + tasklet_kill(&op->thrtsklet); + } + } if ((op->frames) && (op->frames != &op->sframe)) kfree(op->frames);
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