On Tue, May 18, 2021 at 06:41:45PM -0300, Geraldo Nascimento wrote: [...] > Myself I'd hook printk()'s to both ehci_hcd and xhci_hcd to print > every possible variable involved and see if there's any relevant > mismatches. Oh and watch with the printk()'s what libusb seems to be > doing, too. > > When you subscribe to linux-usb you *may* want to Cc: Greg > Kroah-Hartman with your discoveries so far, he's the USB Subsystem > Maintainer and the best one to help you track this down. Thanks for the pointers! It turns out that usb_sndctrlpipe() is not short for "USB sound control pipe". diff --git a/sound/usb/mixer_scarlett_gen2.c b/sound/usb/mixer_scarlett_gen2.c index 560c2ade829d..dcff3e3a49f3 100644 --- a/sound/usb/mixer_scarlett_gen2.c +++ b/sound/usb/mixer_scarlett_gen2.c @@ -635,7 +635,7 @@ static int scarlett2_usb( /* send a second message to get the response */ err = snd_usb_ctl_msg(mixer->chip->dev, - usb_sndctrlpipe(mixer->chip->dev, 0), + usb_rcvctrlpipe(mixer->chip->dev, 0), SCARLETT2_USB_VENDOR_SPECIFIC_CMD_RESP, USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN, 0, I'll properly submit the patch once I've got confirmation from someone else that this fixes the issue. Thanks again, Geoffrey.
