linux-kernel - [PATCH 3/3] drivers/scsi: Use offsetof

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Date:	Wed, 26 Dec 2007 17:15:08 +0100 (MET)
From:	Julia Lawall <julia@...u.dk>
To:	linux-scsi@...r.kernel.org, viro@...iv.linux.org.uk,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH 3/3] drivers/scsi: Use offsetof

From: Julia Lawall <julia@...u.dk>

In the patch cc154ac64aa8d3396b187f64cef01ce67f433324, Al Viro observed
that the proper way to compute the distance between two structure fields is
to use offsetof() or a cast to a pointer to character.  The same change can
be applied to a few more files.

The change was made using the following semantic patch
(http://www.emn.fr/x-info/coccinelle/)

// <smpl>
@r3 disable ptr_to_array@
type T;
T *s;
type T1, T2;
identifier fld1;
@@

(
  (char *)&s->fld1 - (char *)s
|
  (uint8_t *)&s->fld1 - (uint8_t *)s
|
  (u8 *)&s->fld1 - (u8 *)s
|
- (T1)&s->fld1 - (T2)s
+ offsetof(T,fld1)
)
// </smpl>

Signed-off-by: Julia Lawall <julia@...u.dk>
---

diff -u -p a/drivers/scsi/BusLogic.c b/drivers/scsi/BusLogic.c
--- a/drivers/scsi/BusLogic.c	2007-10-22 11:25:20.000000000 +0200
+++ b/drivers/scsi/BusLogic.c	2007-12-26 16:33:42.000000000 +0100
@@ -2856,7 +2856,10 @@ static int BusLogic_QueueCommand(struct
 		CCB->Opcode = BusLogic_InitiatorCCB_ScatterGather;
 		CCB->DataLength = Count * sizeof(struct BusLogic_ScatterGatherSegment);
 		if (BusLogic_MultiMasterHostAdapterP(HostAdapter))
-			CCB->DataPointer = (unsigned int) CCB->DMA_Handle + ((unsigned long) &CCB->ScatterGatherList - (unsigned long) CCB);
+			CCB->DataPointer =
+				(unsigned int) CCB->DMA_Handle +
+				offsetof(struct BusLogic_CCB,
+					 ScatterGatherList);
 		else
 			CCB->DataPointer = Virtual_to_32Bit_Virtual(CCB->ScatterGatherList);
--
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