ALSA: usb-audio: Guard Scarlett2 protocol transfers

Browse source

Scarlett2 controls and hwdep operations reach the proprietary USB
transport without preventing runtime suspend or disconnect. Protect the
central request-and-response helper. One reference then covers the
command, acknowledgment wait, and response.

The runtime and system resume hook submits only the notification URB. It
takes no protocol mutex. Thus, the transport guard does not invert the
existing data_mutex or usb_mutex order. Keep the suspend-time config save
on the unguarded helper because it runs inside the USB suspend callback.

This change protects each USB transaction. It does not hold a runtime-PM
reference across the asynchronous flash-erase interval.

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/20260827232143.149197-5-mrwillporter@gmail.com

...

This commit is contained in:

Will Porter 2026-08-27 18:21:41 -05:00 • committed by Takashi Iwai

parent 103da4a7bc

commit de01880473

1 changed files with 30 additions and 6 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

36

sound/usb/mixer_scarlett2.c

View file