tree 11bf3ac4f0d0b3961fcf1c98ee5cd1824ebd5614
parent 1f033c1a6ec1a6815e9c4507d83eb20161163c37
author H. Peter Anvin <hpa@zytor.com> 1330713828 -0800
committer Linus Torvalds <torvalds@linux-foundation.org> 1330717095 -0800

regset: Prevent null pointer reference on readonly regsets

The regset common infrastructure assumed that regsets would always
have .get and .set methods, but not necessarily .active methods.
Unfortunately people have since written regsets without .set methods.

Rather than putting in stub functions everywhere, handle regsets with
null .get or .set methods explicitly.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Reviewed-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Roland McGrath <roland@hack.frob.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>