Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
ALSA: usb-audio: Optimize the copy of packet sizes for implicit fb handling
We did manual copies over loop for the packet data update of the
implicit feedback, but this can be optimized with a simple memcpy().
Along with it, change the data type of snd_usb_packet_info struct to
align with other (from uint32_t to int).
No functional changes but only code optimizations.
Link: https://patch.msgid.link/20260216141209.1849200-3-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
+4
-4
+1
-1
sound/usb/card.h
+1
-1
sound/usb/card.h
+3
-3
sound/usb/endpoint.c
+3
-3
sound/usb/endpoint.c
···
462
462
while (ep_state_running(ep)) {
463
463
struct snd_usb_packet_info *packet;
464
464
struct snd_urb_ctx *ctx = NULL;
465
-
int err, i;
465
+
int err;
466
466
467
467
scoped_guard(spinlock_irqsave, &ep->lock) {
468
468
if ((!implicit_fb || ep->next_packet_queued > 0) &&
···
482
482
/* copy over the length information */
483
483
if (implicit_fb) {
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484
ctx->packets = packet->packets;
485
-
for (i = 0; i < packet->packets; i++)
486
-
ctx->packet_size[i] = packet->packet_size[i];
485
+
memcpy(ctx->packet_size, packet->packet_size,
486
+
packet->packets * sizeof(packet->packet_size[0]));
487
487
}
488
488
489
489
/* call the data handler to fill in playback data */