tree 2efdf37fc4b48748d19ed2e3cb8a75908581fd26
parent f889491380582b4ba2981cf0b0d7d6a40fb30ab7
author Omar Sandoval <osandov@fb.com> 1485936147 -0800
committer Michael S. Tsirkin <mst@redhat.com> 1488411306 +0200

virtio-console: avoid DMA from stack

put_chars() stuffs the buffer it gets into an sg, but that buffer may be
on the stack. This breaks with CONFIG_VMAP_STACK=y (for me, it
manifested as printks getting turned into NUL bytes).

Signed-off-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Amit Shah <amit.shah@redhat.com>