[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>

3 files changed, 5 insertions, 6 deletions

diff --git a/drivers/scsi/aacraid/commctrl.c b/drivers/scsi/aacraid/commctrl.c
index 987e35e4078e..72b0393b4596 100644
--- a/drivers/scsi/aacraid/commctrl.c
+++ b/drivers/scsi/aacraid/commctrl.c
@@ -391,10 +391,8 @@ static int close_getadapter_fib(struct aac_dev * dev, void __user *arg)
                 /*
                  *      Extract the fibctx from the input parameters
                  */
-                if (fibctx->unique == (u32)(unsigned long)arg) {   
-                        /* We found a winner */
+                if (fibctx->unique == (u32)(ptrdiff_t)arg) /* We found a winner */
                         break;
-                }
                 entry = entry->next;
                 fibctx = NULL;
         }
diff --git a/drivers/scsi/aacraid/comminit.c b/drivers/scsi/aacraid/comminit.c
index ae34768987a4..33682ce96a5d 100644
--- a/drivers/scsi/aacraid/comminit.c
+++ b/drivers/scsi/aacraid/comminit.c
@@ -5,7 +5,7 @@
  * based on the old aacraid driver that is..
  * Adaptec aacraid device driver for Linux.
  *
- * Copyright (c) 2000 Adaptec, Inc. (aacraid@adaptec.com)
+ * Copyright (c) 2000-2007 Adaptec, Inc. (aacraid@adaptec.com)
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -110,7 +110,7 @@ static int aac_alloc_comm(struct aac_dev *dev, void **commaddr, unsigned long co
         /*
          *      Align the beginning of Headers to commalign
          */
-        align = (commalign - ((unsigned long)(base) & (commalign - 1)));
+        align = (commalign - ((ptrdiff_t)(base) & (commalign - 1)));
         base = base + align;
         phys = phys + align;
         /*
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;