[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, 1 insertions, 3 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;
         }