On 2025-02-03 10:50:57 [-0700], Jillian Donahue wrote: > From a97fceb3e51c478dee6d63caafb92c867432c042 Mon Sep 17 00:00:00 2001 > From: Jill Donahue <jilliandonahue58@xxxxxxxxx> > Date: Mon, 3 Feb 2025 10:46:31 -0700 > Subject: [PATCH] f_midi_complete to call tasklet_hi_schedule > > When using USB MIDI, a spinlock is hit causing a kernel oops. This It is not an oops, it is a deadlock and in general a lock-up. On PREEMPT_RT you see this backtrace. Non-RT with lockdep should report something. I would stay with deadlock. > happens because a lock is attempted to be acquired twice through > f_midi_transmit. The fix lies in calling tasklet_hi_schedule() in > f_midi_complete to remove the repeated call to f_midi_transmit. s/The.* Use tasklet_hi_schedule() to schedule f_midi_transmit() via a tasklet from the completion handler. > Link: https://lore.kernel.org/all/CAArt=LjxU0fUZOj06X+5tkeGT+6RbXzpWg1h4t4Fwa_KGVAX6g@xxxxxxxxxxxxxx/ > > Fixes: d5daf49b58661 ("USB: gadget: midi: add midi function driver") Way better. Please run it via ./scripts/check_patch.pl. It will tell you that you need a sign-of-by line. Please check what it means and if you agree with it. Please run it via scripts/get_maintainer.pl and send it to that list. Thank you. Sebastian
