[11/15] tty: hvc: hvc_poll break hv read loop

[Michael Ellerman]

On Mon, 2018-04-30 at 14:55:54 UTC, Nicholas Piggin wrote:
> Avoid looping with the spinlock held while there is read data
> being returned from the hv driver. Instead note if the entire
> size returned by tty_buffer_request_room was read, and request
> another read poll.
> 
> This limits the critical section lengths, and provides more
> even service to other consoles in case there is a pathological
> condition.
> 
> Signed-off-by: Nicholas Piggin <npiggin at gmail.com>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/ec97eaad1383ab2500fcf9a07ade60

cheers