On Fri, Jun 29, 2018 at 10:43:30AM -0600, Tycho Andersen wrote:

On Fri, Jun 29, 2018 at 04:24:46AM -0600, Tycho Andersen wrote:

quoted

v2: switch to locking uport->lock on allocation/deallocation instead of
    locking the per-port mutex in uart_put_char. Note that since
    uport->lock is a spin lock, we have to switch the allocation to
    GFP_ATOMIC.

Serge pointed out off-list that we may want to do the allocation
before the lock so that it's more likely to be successful. I'm happy
to send that change to this if it's what we want to do, I don't have a
strong preference.

That sounds like a much better thing to do.

thanks,

greg k-h