ieee1394: add preprocessor constant for invalid csr address

Replace occurrences of the magic value ~(u64)0 for invalid
CSR address spaces by a named constant for better readability.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Signed-off-by: Ben Collins <bcollins@ubuntu.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/ieee1394/csr1212.c b/drivers/ieee1394/csr1212.c
index 15773544234b..586f71e7346a 100644
--- a/drivers/ieee1394/csr1212.c
+++ b/drivers/ieee1394/csr1212.c
@@ -779,7 +779,7 @@ static int csr1212_append_new_cache(struct csr1212_csr *csr, size_t romsize)
         romsize = (romsize + (csr->max_rom - 1)) & ~(csr->max_rom - 1);
 
         csr_addr = csr->ops->allocate_addr_range(romsize, csr->max_rom, csr->private);
-        if (csr_addr == ~0ULL) {
+        if (csr_addr == CSR1212_INVALID_ADDR_SPACE) {
                 return CSR1212_ENOMEM;
         }
         if (csr_addr < CSR1212_REGISTER_SPACE_BASE) {