git: 21e0d2aa35bf - stable/14 - sound: Return if the new speed/format is the same as the current one

The branch stable/14 has been updated by christos:

URL: https://cgit.FreeBSD.org/src/commit/?id=21e0d2aa35bf41951f1835eac0dd58be257cbc17

commit 21e0d2aa35bf41951f1835eac0dd58be257cbc17
Author:     Christos Margiolis <christos@FreeBSD.org>
AuthorDate: 2025-02-25 11:44:12 +0000
Commit:     Christos Margiolis <christos@FreeBSD.org>
CommitDate: 2025-03-04 15:46:06 +0000

    sound: Return if the new speed/format is the same as the current one
    
    This gives us a slight performance boost since we do not have to go
    through chn_setparam() and the driver functions.
    
    Sponsored by:   The FreeBSD Foundation
    MFC after:      1 week
    Reviewed by:    dev_submerge.ch, emaste
    Differential Revision:  https://reviews.freebsd.org/D48012
    
    (cherry picked from commit 40616b7e41ff96b6d7522445b00f27f26d593a85)
---
 sys/dev/sound/pcm/channel.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/sys/dev/sound/pcm/channel.c b/sys/dev/sound/pcm/channel.c
index 19b2db321cee..c3ee50d51c4b 100644
--- a/sys/dev/sound/pcm/channel.c
+++ b/sys/dev/sound/pcm/channel.c
@@ -2110,6 +2110,9 @@ chn_setspeed(struct pcm_channel *c, uint32_t speed)
 	oldformat = c->format;
 	oldspeed = c->speed;
 
+	if (c->speed == speed)
+		return (0);
+
 	ret = chn_setparam(c, c->format, speed);
 	if (ret != 0) {
 		if (snd_verbose > 3)
@@ -2138,6 +2141,9 @@ chn_setformat(struct pcm_channel *c, uint32_t format)
 	oldformat = c->format;
 	oldspeed = c->speed;
 
+	if (c->format == format)
+		return (0);
+
 	ret = chn_setparam(c, format, c->speed);
 	if (ret != 0) {
 		if (snd_verbose > 3)