commit c8e252586f8d5de906385d8cf6385fee289a825e
author H. Peter Anvin <hpa@zytor.com> Fri Mar 02 10:43:48 2012 -0800
committer Linus Torvalds <torvalds@linux-foundation.org> Fri Mar 02 11:38:15 2012 -0800
tree 11bf3ac4f0d0b3961fcf1c98ee5cd1824ebd5614
parent 1f033c1a6ec1a6815e9c4507d83eb20161163c37

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>