ALSA: usb-audio: Add PM guards to RME Digiface controls

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The RME Digiface status and register helpers issue vendor requests
without preventing runtime suspend or disconnect. The volatile status
controls can repeatedly reach these unguarded paths while userspace
polls them.

Protect both helpers with snd_usb_lock. All Digiface get and put
callbacks then resume the device and hold the disconnect reference
across their transfer.

Assisted-by: Codex:gpt-5.6-sol
Signed-off-by: Will Porter <mrwillporter@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Link: https://patch.msgid.link/20260827232143.149197-6-mrwillporter@gmail.com

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Will Porter 2026-08-27 18:21:42 -05:00 • committed by Takashi Iwai

parent de01880473

commit 9d4ae593fc

1 changed files with 8 additions and 0 deletions

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sound/usb/mixer_quirks.c

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