tree 4c05fb0e4b4f6db8a2a56921f28dc5cc0931ce6e
parent a9bf5c8a271b9a954709b7ada1bd258f5cadf7ff
author Nicholas Piggin <npiggin@gmail.com> 1525100154 +1000
committer Michael Ellerman <mpe@ellerman.id.au> 1532340715 +1000

tty: hvc: hvc_poll() break hv read loop

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@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>