Merge tag 'mute-led-rework' of https://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound into asoc-5.13

ALSA: control - add generic LED API

This patchset tries to resolve the diversity in the audio LED
control among the ALSA drivers. A new control layer registration
is introduced which allows to run additional operations on
top of the elementary ALSA sound controls.

A new control access group (three bits in the access flags)
was introduced to carry the LED group information for
the sound controls. The low-level sound drivers can just
mark those controls using this access group. This information
is not exported to the user space, but user space can
manage the LED sound control associations through sysfs
(last patch) per Mark's request. It makes things fully
configurable in the kernel and user space (UCM).

The actual state ('route') evaluation is really easy
(the minimal value check for all channels / controls / cards).
If there's more complicated logic for a given hardware,
the card driver may eventually export a new read-only
sound control for the LED group and do the logic itself.

The new LED trigger control code is completely separated
and possibly optional (there's no symbol dependency).
The full code separation allows eventually to move this
LED trigger control to the user space in future.
Actually it replaces the already present functionality
in the kernel space (HDA drivers) and allows a quick adoption
for the recent hardware (ASoC codecs including SoundWire).

snd_ctl_led            24576  0

The sound driver implementation is really easy:

1) call snd_ctl_led_request() when control LED layer should be
   automatically activated
   / it calls module_request("snd-ctl-led") on demand /
2) mark all related kcontrols with
        SNDRV_CTL_ELEM_ACCESS_SPK_LED or
        SNDRV_CTL_ELEM_ACCESS_MIC_LED

Link: https://lore.kernel.org/r/20210317172945.842280-1-perex@perex.cz
Signed-off-by: Takashi Iwai <tiwai@suse.de>

3 files changed, 8 insertions, 8 deletions

diff --git a/net/sctp/output.c b/net/sctp/output.c
index 6614c9fdc51e..a6aa17df09ef 100644
--- a/net/sctp/output.c
+++ b/net/sctp/output.c
@@ -584,13 +584,6 @@ int sctp_packet_transmit(struct sctp_packet *packet, gfp_t gfp)
 		goto out;
 	}
 
-	rcu_read_lock();
-	if (__sk_dst_get(sk) != tp->dst) {
-		dst_hold(tp->dst);
-		sk_setup_caps(sk, tp->dst);
-	}
-	rcu_read_unlock();
-
 	/* pack up chunks */
 	pkt_count = sctp_packet_pack(packet, head, gso, gfp);
 	if (!pkt_count) {
diff --git a/net/sctp/outqueue.c b/net/sctp/outqueue.c
index 3fd06a27105d..5cb1aa5f067b 100644
--- a/net/sctp/outqueue.c
+++ b/net/sctp/outqueue.c
@@ -1135,6 +1135,7 @@ static void sctp_outq_flush_data(struct sctp_flush_ctx *ctx,
 
 static void sctp_outq_flush_transports(struct sctp_flush_ctx *ctx)
 {
+	struct sock *sk = ctx->asoc->base.sk;
 	struct list_head *ltransport;
 	struct sctp_packet *packet;
 	struct sctp_transport *t;
@@ -1144,6 +1145,12 @@ static void sctp_outq_flush_transports(struct sctp_flush_ctx *ctx)
 		t = list_entry(ltransport, struct sctp_transport, send_ready);
 		packet = &t->packet;
 		if (!sctp_packet_empty(packet)) {
+			rcu_read_lock();
+			if (t->dst && __sk_dst_get(sk) != t->dst) {
+				dst_hold(t->dst);
+				sk_setup_caps(sk, t->dst);
+			}
+			rcu_read_unlock();
 			error = sctp_packet_transmit(packet, ctx->gfp);
 			if (error < 0)
 				ctx->q->asoc->base.sk->sk_err = -error;
diff --git a/net/sctp/tsnmap.c b/net/sctp/tsnmap.c
index a9c6af5795d8..5ba456727f63 100644
--- a/net/sctp/tsnmap.c
+++ b/net/sctp/tsnmap.c
@@ -75,7 +75,7 @@ int sctp_tsnmap_check(const struct sctp_tsnmap *map, __u32 tsn)
 		return 1;
 
 	/* Verify that we can hold this TSN and that it will not
-	 * overlfow our map
+	 * overflow our map
 	 */
 	if (!TSN_lt(tsn, map->base_tsn + SCTP_TSN_MAP_SIZE))
 		return -1;