usb: host: xhci: check DYING state earlier
PATCH 2/20 usb: host: xhci: check DYING state earlier
Hi,
Quoted 9 lines · Mathias Nyman
Quoted 3 lines · Felipe Balbi
Instead of allocating urb priv and, maybe, bail out due to xhci being in DYING state, we can move the check earlier and avoid the memory allocation altogether.
This also moves checking for DYING outside the lock.
Most cases set DYING with lock held, so if we first get the lock before checking DYING we have a better chance of not being in the process of dying.
pretty sure that's atomic, though.
Quoted 1 line
Small thing, but so is this cleanup, so not sure its worth the change
Look at the result. With this change we don't need to take a lock, allocate memory, search for endpoint index, search for endpoint state. All of those are needed for proper operation of the function, but if the controller has already died, there's no point in going any further.