iSCSI/iBFT: use proper address translation

In virtual environments (namely, Xen Dom0) virt <-> phys and
virt <-> isa-bus translations cannot be freely interchanged (and
even outside such environments it is not really correct to do so).
When looking at memory below 1M, the latter translations should
always be used.

iscsi_ibft_find.c part from: Martin Wilck <martin.wilck@ts.fujitsu.com>.

Signed-off-by: Jan Beulich <jbeulich@novell.com>
Signed-off-by: Peter Jones <pjones@redhat.com>
Signed-off-by: Konrad Rzeszutek Wilk <ketuzsezs@darnok.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/firmware/iscsi_ibft_find.c b/drivers/firmware/iscsi_ibft_find.c
index d53fbbfefa3e..dfb15c06c88f 100644
--- a/drivers/firmware/iscsi_ibft_find.c
+++ b/drivers/firmware/iscsi_ibft_find.c
@@ -65,10 +65,10 @@ void __init reserve_ibft_region(void)
                  * so skip that area */
                 if (pos == VGA_MEM)
                         pos += VGA_SIZE;
-                virt = phys_to_virt(pos);
+                virt = isa_bus_to_virt(pos);
                 if (memcmp(virt, IBFT_SIGN, IBFT_SIGN_LEN) == 0) {
                         unsigned long *addr =
-                            (unsigned long *)phys_to_virt(pos + 4);
+                            (unsigned long *)isa_bus_to_virt(pos + 4);
                         len = *addr;
                         /* if the length of the table extends past 1M,
                          * the table cannot be valid. */