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ALSA: snd-usb-caiaq: only warn once on streaming errors

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Limit the number of printed warnings to one in case of streaming errors.
printk() happens to be expensive, especially in code called as often as
here.

Signed-off-by: Daniel Mack <daniel@caiaq.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Daniel Mack 2009-03-18 11:03:53 +01:00 committed by Takashi Iwai
parent 238c0270ba
commit 1313e70414
2 changed files with 4 additions and 2 deletions
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4
sound/usb/caiaq/caiaq-audio.c
View File

@ -114,6 +114,7 @@ static int stream_start(struct snd_usb_caiaqdev *dev)
dev->output_panic = 0;
dev->first_packet = 1;
dev->streaming = 1;
dev->warned = 0;
for (i = 0; i < N_URBS; i++) {
ret = usb_submit_urb(dev->data_urbs_in[i], GFP_ATOMIC);
@ -406,10 +407,11 @@ static void read_in_urb(struct snd_usb_caiaqdev *dev,
break;
}
if (dev->input_panic || dev->output_panic) {
if ((dev->input_panic || dev->output_panic) && !dev->warned) {
debug("streaming error detected %s %s\n",
dev->input_panic ? "(input)" : "",
dev->output_panic ? "(output)" : "");
dev->warned = 1;
}
}

2
sound/usb/caiaq/caiaq-device.h
View File

@ -89,7 +89,7 @@ struct snd_usb_caiaqdev {
int audio_out_buf_pos[MAX_STREAMS];
int period_in_count[MAX_STREAMS];
int period_out_count[MAX_STREAMS];
int input_panic, output_panic;
int input_panic, output_panic, warned;
char *audio_in_buf, *audio_out_buf;
unsigned int samplerates;