drivers/char/mem: use get_user()/put_user() for /dev/port byte copies

read_port() and write_port() check the whole user buffer with
access_ok() and then move it one byte at a time with __put_user() and
__get_user(), doing an inb() or outb() for each.  Each of those accesses
enables and disables user access on its own, so the up-front check saves
nothing.

Use put_user() and get_user().  The access_ok() stays, because it also
makes a partly invalid buffer fail up front, rather than after some
ports have already been read or written.

This is part of getting rid of __get_user() and __put_user() entirely.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

0 files changed, 0 insertions, 0 deletions