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: Chris Down <chris@xxxxxxxxxxxxxx>
---
sound/usb/endpoint.c | 5 +++--
sound/usb/usbaudio.h | 2 ++
2 files changed, 5 insertions(+), 2 deletions(-)
diff --git a/sound/usb/endpoint.c b/sound/usb/endpoint.c
index 647fa054d8b1..2cd99cc8c360 100644
--- a/sound/usb/endpoint.c
+++ b/sound/usb/endpoint.c
@@ -916,8 +916,9 @@ static int endpoint_set_interface(struct snd_usb_audio *chip,
ep->iface, altset, ep->ep_num);
err = usb_set_interface(chip->dev, ep->iface, altset);
if (err < 0) {
- usb_audio_err(chip, "%d:%d: usb_set_interface failed (%d)\n",
- ep->iface, altset, err);
+ usb_audio_err_ratelimited(
+ chip, "%d:%d: usb_set_interface failed (%d)\n",
+ ep->iface, altset, err);
return err;
}
diff --git a/sound/usb/usbaudio.h b/sound/usb/usbaudio.h
index f5a8dca66457..38a85b2c9a73 100644
--- a/sound/usb/usbaudio.h
+++ b/sound/usb/usbaudio.h
@@ -67,6 +67,8 @@ struct snd_usb_audio {
#define usb_audio_err(chip, 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...) \
dev_warn(&(chip)->dev->dev, fmt, ##args)
#define usb_audio_info(chip, fmt, args...) \
--
2.40.0
