linux-kernel - [PATCH 3.12 033/113] can: bcm: fix hrtimer/tasklet termination in bcm op removal

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Message-Id: <192c10ab8c5a29f87518587f4c3f0f13353ee049.1488791430.git.jslaby@suse.cz>
Date:   Mon,  6 Mar 2017 10:10:57 +0100
From:   Jiri Slaby <jslaby@...e.cz>
To:     stable@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        Oliver Hartkopp <socketcan@...tkopp.net>,
        Marc Kleine-Budde <mkl@...gutronix.de>,
        Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 033/113] can: bcm: fix hrtimer/tasklet termination in bcm op removal

From: Oliver Hartkopp <socketcan@...tkopp.net>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

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@....de>
Signed-off-by: Oliver Hartkopp <socketcan@...tkopp.net>
Tested-by: Michael Josenhans <michael.josenhans@....de>
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 net/can/bcm.c | 23 ++++++++++++++++-------
 1 file changed, 16 insertions(+), 7 deletions(-)

diff --git a/net/can/bcm.c b/net/can/bcm.c
index 392a687d3ca6..e845618f53dd 100644
--- a/net/can/bcm.c
+++ b/net/can/bcm.c
@@ -706,14 +706,23 @@ static struct bcm_op *bcm_find_op(struct list_head *ops, canid_t can_id,
 
 static void bcm_remove_op(struct bcm_op *op)
 {
-	hrtimer_cancel(&op->timer);
-	hrtimer_cancel(&op->thrtimer);
-
-	if (op->tsklet.func)
-		tasklet_kill(&op->tsklet);
+	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->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);
-- 
2.12.0