Commit 2db2be56 authored by Chris Down's avatar Chris Down Committed by Takashi Iwai

ALSA: usb-audio: Rate limit usb_set_interface error reporting

When an error occurs during USB disconnection sometimes things can go
wrong as endpoint_set_interface may end up being called repeatedly. For
example:

% dmesg --notime | grep 'usb 3-7.1.4' | sort | uniq -c | head -2
   3069 usb 3-7.1.4: 1:1: usb_set_interface failed (-19)
    908 usb 3-7.1.4: 1:1: usb_set_interface failed (-71)

In my case, there sometimes are hundreds of these usb_set_interface
failure messages a second when I disconnect the hub that has my USB
audio device.

These messages can take a huge amount of the kmsg ringbuffer and don't
provide any extra information over the previous ones, so ratelimit them.
Signed-off-by: default avatarChris Down <chris@chrisdown.name>
Link: https://lore.kernel.org/r/ZEKf8UYBYa1h4JWR@chrisdown.nameSigned-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent 4d421eeb
...@@ -916,8 +916,9 @@ static int endpoint_set_interface(struct snd_usb_audio *chip, ...@@ -916,8 +916,9 @@ static int endpoint_set_interface(struct snd_usb_audio *chip,
ep->iface, altset, ep->ep_num); ep->iface, altset, ep->ep_num);
err = usb_set_interface(chip->dev, ep->iface, altset); err = usb_set_interface(chip->dev, ep->iface, altset);
if (err < 0) { if (err < 0) {
usb_audio_err(chip, "%d:%d: usb_set_interface failed (%d)\n", usb_audio_err_ratelimited(
ep->iface, altset, err); chip, "%d:%d: usb_set_interface failed (%d)\n",
ep->iface, altset, err);
return err; return err;
} }
......
...@@ -67,6 +67,8 @@ struct snd_usb_audio { ...@@ -67,6 +67,8 @@ struct snd_usb_audio {
#define usb_audio_err(chip, fmt, args...) \ #define usb_audio_err(chip, fmt, args...) \
dev_err(&(chip)->dev->dev, fmt, ##args) dev_err(&(chip)->dev->dev, fmt, ##args)
#define usb_audio_err_ratelimited(chip, fmt, args...) \
dev_err_ratelimited(&(chip)->dev->dev, fmt, ##args)
#define usb_audio_warn(chip, fmt, args...) \ #define usb_audio_warn(chip, fmt, args...) \
dev_warn(&(chip)->dev->dev, fmt, ##args) dev_warn(&(chip)->dev->dev, fmt, ##args)
#define usb_audio_info(chip, fmt, args...) \ #define usb_audio_info(chip, fmt, args...) \
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment