[SCSI] aacraid: resolve compiler warnings using ptrdiff_t

Unsigned long is not always the same size as a pointer, namely on 32 bit
systems with 64 bit address space. Ptrdiff_t is the same size as a
pointer in all configurations. By using ptrdiff_t we can mitigate the
warning messages on these configurations. There should be no side
effects of this patch.

Signed-off-by: Mark Salyzyn <aacraid@adaptec.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/scsi/aacraid/dpcsup.c b/drivers/scsi/aacraid/dpcsup.c
index 4e53f9db1b2c..fbf27f59a311 100644
--- a/drivers/scsi/aacraid/dpcsup.c
+++ b/drivers/scsi/aacraid/dpcsup.c
@@ -256,7 +256,8 @@ unsigned int aac_intr_normal(struct aac_dev * dev, u32 Index)
                         return 1;
                 }
                 memset(hw_fib, 0, sizeof(struct hw_fib));
-                memcpy(hw_fib, (struct hw_fib *)(((unsigned long)(dev->regs.sa)) + (index & ~0x00000002L)), sizeof(struct hw_fib));
+                memcpy(hw_fib, (struct hw_fib *)(((ptrdiff_t)(dev->regs.sa)) +
+                  (index & ~0x00000002L)), sizeof(struct hw_fib));
                 memset(fib, 0, sizeof(struct fib));
                 INIT_LIST_HEAD(&fib->fiblink);
                 fib->type = FSAFS_NTC_FIB_CONTEXT;