linux-kernel - [PATCH] Don't blatt first element of prv in sg

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Date:	Mon, 7 Jan 2008 15:38:42 +1100
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Tejun Heo <htejun@...il.com>
Cc:	James Bottomley <James.Bottomley@...senpartnership.com>,
	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
	Jens Axboe <jens.axboe@...cle.com>
Subject: [PATCH] Don't blatt first element of prv in sg_chain()

I realize that sg chaining is a ploy to make the rest of the kernel
devs feel the pain of the SCSI subsystem.  But this was a little
unsubtle.

Signed-off-by: Rusty Russell <rusty@...tcorp.com.au>

diff -r b3aec596b841 include/linux/scatterlist.h
--- a/include/linux/scatterlist.h	Mon Jan 07 12:43:56 2008 +1100
+++ b/include/linux/scatterlist.h	Mon Jan 07 15:01:51 2008 +1100
@@ -188,8 +188,8 @@ static inline void sg_chain(struct scatt
 	/*
 	 * offset and length are unused for chain entry.  Clear them.
 	 */
-	prv->offset = 0;
-	prv->length = 0;
+	prv[prv_nents - 1].offset = 0;
+	prv[prv_nents - 1].length = 0;
 
 	/*
 	 * Set lowest bit to indicate a link pointer, and make sure to clear
--
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