From f4364dcfc86df7c1ca47b256eaf6b6d0cdd0d936 Mon Sep 17 00:00:00 2001 From: Sean Young Date: Sun, 27 May 2018 12:24:09 +0100 Subject: media: rc: introduce BPF_PROG_LIRC_MODE2 Add support for BPF_PROG_LIRC_MODE2. This type of BPF program can call rc_keydown() to reported decoded IR scancodes, or rc_repeat() to report that the last key should be repeated. The bpf program can be attached to using the bpf(BPF_PROG_ATTACH) syscall; the target_fd must be the /dev/lircN device. Acked-by: Yonghong Song Signed-off-by: Sean Young Signed-off-by: Daniel Borkmann --- drivers/media/rc/rc-ir-raw.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) (limited to 'drivers/media/rc/rc-ir-raw.c') diff --git a/drivers/media/rc/rc-ir-raw.c b/drivers/media/rc/rc-ir-raw.c index 374f83105a234..7675b7ee5bc76 100644 --- a/drivers/media/rc/rc-ir-raw.c +++ b/drivers/media/rc/rc-ir-raw.c @@ -14,7 +14,7 @@ static LIST_HEAD(ir_raw_client_list); /* Used to handle IR raw handler extensions */ -static DEFINE_MUTEX(ir_raw_handler_lock); +DEFINE_MUTEX(ir_raw_handler_lock); static LIST_HEAD(ir_raw_handler_list); static atomic64_t available_protocols = ATOMIC64_INIT(0); @@ -621,9 +621,17 @@ void ir_raw_event_unregister(struct rc_dev *dev) list_for_each_entry(handler, &ir_raw_handler_list, list) if (handler->raw_unregister) handler->raw_unregister(dev); - mutex_unlock(&ir_raw_handler_lock); + + lirc_bpf_free(dev); ir_raw_event_free(dev); + + /* + * A user can be calling bpf(BPF_PROG_{QUERY|ATTACH|DETACH}), so + * ensure that the raw member is null on unlock; this is how + * "device gone" is checked. + */ + mutex_unlock(&ir_raw_handler_lock); } /* -- cgit v1.2.3