Re: [BUG] usbip: vhci: Sleeping function called from invalid context in vhci_urb_enqueue on PREEMPT_RT

[Alan Stern]

On Sat, Aug 16, 2025 at 10:16:34AM -0400, Alan Stern wrote:
> So it looks like we should be using a different function instead of 
> local_irq_disable().  We need something which in a non-RT build will 
> disable interrupts on the local CPU, but in an RT build will merely 
> disable preemption.  (In fact, every occurrence of local_irq_disable() 
> in the USB subsystem probably should be changed in this way.)

Or maybe what we need is something that in a non-RT build will disable 
local interrupts and in an RT build will do nothing.  (I suspect that RT 
kernels won't like it if we call spin_lock() while preemption is 
disabled.)

> Is there such a function?

Alan Stern