On Fri, 24 Nov 2017 16:45:53 +0200, Felipe Balbi <balbi@xxxxxxxxxx>
wrote:
> no, it's not. This is because of our call to wait_event_lock_irq() in
> dwc3_gadget_ep_dequeue(). That call works fine in all other cases
> because dequeue is never called with IRQs disabled, apart from this one
> case in f_fs.c :-)
>
> Can you confirm that this helps:
>
> modified drivers/usb/gadget/function/f_fs.c
> @@ -1077,15 +1077,11 @@ static int ffs_aio_cancel(struct kiocb *kiocb)
>
> ENTER();
>
> - spin_lock_irq(&epfile->ffs->eps_lock);
> -
> if (likely(io_data && io_data->ep && io_data->req))
> value = usb_ep_dequeue(io_data->ep, io_data->req);
> else
> value = -EINVAL;
>
> - spin_unlock_irq(&epfile->ffs->eps_lock);
> -
> return value;
> }
>
It sadly does not help, though it does something: now serial output
stops early (tried twice, happened twice):
[ 103.274725] BUG: scheduling while atomic: swapper/1/0/0x00000100
[ 103.280990] 3 locks held by swapper/1/0:
[ 103.280998] #0: (rcu_callback){....}, at: [<c10b4ff0>] rcu_process_callbacks+0x260/0x440
[ 103.281053] #1: (rcu_read_lock_sched){....}, at: [<c1358ba0>] percpu_ref_switch_to_atomic_rcu+0xb0/0x130
[ 103.281097] #2: (&(&ctx->ctx_lock)->rlock){....}, at: [<c11f0c73>] free_ioctx_us
So I do not get dropped to kdb...
--
Vincent Pelletier
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