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USB: gadget: f_midi: f_midi_complete to call queue_work

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When using USB MIDI, a lock is attempted to be acquired twice through a
re-entrant call to f_midi_transmit, causing a deadlock.

Fix it by using queue_work() to schedule the inner f_midi_transmit() via
a high priority work queue from the completion handler.

Link: https://lore.kernel.org/all/CAArt=LjxU0fUZOj06X+5tkeGT+6RbXzpWg1h4t4Fwa_KGVAX6g@mail.gmail.com/
Fixes: d5daf49b58 ("USB: gadget: midi: add midi function driver")
Cc: stable <stable@kernel.org>
Signed-off-by: Jill Donahue <jilliandonahue58@gmail.com>
Link: https://lore.kernel.org/r/20250211174805.1369265-1-jdonahue@fender.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jill Donahue 2025-02-11 10:48:05 -07:00 • committed by Greg Kroah-Hartman
parent 4aac0db5a0
commit 4ab37fcb42
1 changed files with 1 additions and 1 deletions
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2
drivers/usb/gadget/function/f_midi.c
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@ -283,7 +283,7 @@ f_midi_complete(struct usb_ep *ep, struct usb_request *req)
/* Our transmit completed. See if there's more to go.
* f_midi_transmit eats req, don't queue it again. */
req->length = 0;
f_midi_transmit(midi);
queue_work(system_highpri_wq, &midi->work);
return;
}
break;