firewire: use bitwise and to get reg in handle_registers

for code efficiency.

Signed-off-by: Jarod Wilson <jwilson@redhat.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/firewire/fw-transaction.c b/drivers/firewire/fw-transaction.c
index 47bfe761250f..3682e75a09e1 100644
--- a/drivers/firewire/fw-transaction.c
+++ b/drivers/firewire/fw-transaction.c
@@ -797,7 +797,7 @@ handle_registers(struct fw_card *card, struct fw_request *request,
                  unsigned long long offset,
                  void *payload, size_t length, void *callback_data)
 {
-        int reg = offset - CSR_REGISTER_BASE;
+        int reg = offset & ~CSR_REGISTER_BASE;
         unsigned long long bus_time;
         __be32 *data = payload;