tree 8afca673d77c1a15585b96df977e39601db535f5
parent 3914ac7b0e672131dc2ac8b415ada79c4ccbbb31
author Linas Vepstas <linas@linas.org> 1131065714 -0600
committer Paul Mackerras <paulus@samba.org> 1136867431 +1100

[PATCH] powerpc: IOMMU: don't ioremap null addresses

240-ioremap-null-ptr-test.patch

Under highly unusual circumstances, a buggy driver will ask a null ptr
to be ioremapped, an operation that curently succeeds but leads to
later trouble.  Instead, refuse to remap the null pointer.

Signed-off-by: Linas Vepstas <linas@austin.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
(cherry picked from e71d9e598533c1889e7162f5f4647e5d378c102c commit)