Oliver Hartkopp 5b48f5711f can: bcm: use call_rcu() instead of costly synchronize_rcu() ... commit f1b4e32aca upstream. In commit d5f9023fa6 ("can: bcm: delay release of struct bcm_op after synchronize_rcu()") Thadeu Lima de Souza Cascardo introduced two synchronize_rcu() calls in bcm_release() (only once at socket close) and in bcm_delete_rx_op() (called on removal of each single bcm_op). Unfortunately this slow removal of the bcm_op's affects user space applications like cansniffer where the modification of a filter removes 2048 bcm_op's which blocks the cansniffer application for 40(!) seconds. In commit 181d444790 ("can: gw: use call_rcu() instead of costly synchronize_rcu()") Eric Dumazet replaced the synchronize_rcu() calls with several call_rcu()'s to safely remove the data structures after the removal of CAN ID subscriptions with can_rx_unregister() calls. This patch adopts Erics approach for the can-bcm which should be applicable since the removal of tasklet_kill() in bcm_remove_op() and the introduction of the HRTIMER_MODE_SOFT timer handling in Linux 5.4. Fixes: d5f9023fa6 ("can: bcm: delay release of struct bcm_op after synchronize_rcu()") # >= 5.4 Link: https://lore.kernel.org/all/20220520183239.19111-1-socketcan@hartkopp.net Cc: stable@vger.kernel.org Cc: Eric Dumazet <edumazet@google.com> Cc: Norbert Slusarek <nslusarek@gmx.net> Cc: Thadeu Lima de Souza Cascardo <cascardo@canonical.com> Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2022-07-12 16:30:46 +02:00
..
j1939	can: j1939: j1939_tp_cmd_recv(): check the dst address of TP.CM_BAM	2021-12-08 09:01:08 +01:00
af_can.c	net: introduce CAN specific pointer in the struct net_device	2021-04-07 14:47:41 +02:00
af_can.h	can: introduce CAN midlayer private and allocate it automatically	2019-09-04 13:29:14 +02:00
bcm.c	can: bcm: use call_rcu() instead of costly synchronize_rcu()	2022-07-12 16:30:46 +02:00
gw.c	can: gw: synchronize rcu operations before removing gw job entry	2021-07-14 16:53:04 +02:00
Kconfig	can: add support of SAE J1939 protocol	2019-09-04 14:22:33 +02:00
Makefile	can: add support of SAE J1939 protocol	2019-09-04 14:22:33 +02:00
proc.c	net: introduce CAN specific pointer in the struct net_device	2021-04-07 14:47:41 +02:00
raw.c	can: raw: raw_setsockopt(): fix raw_rcv panic for sock UAF	2021-08-04 12:27:38 +02:00