linux-kernel - [PATCH 2/2] nbd: change a parameter's type to remove a memcpy call

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Message-Id: <11848377013773-git-send-email-crquan@gmail.com>
Date:	Thu, 19 Jul 2007 17:34:31 +0800
From:	Denis Cheng <crquan@...il.com>
To:	Paul Clements <Paul.Clements@...eleye.com>
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	Pavel Machek <pavel@....cz>,
	Steven Whitehouse <steve@...gwyn.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Denis Cheng <crquan@...il.com>
Subject: [PATCH 2/2] nbd: change a parameter's type to remove a memcpy call

this memcpy looks so strange, in fact it's merely a pointer dereference,
so I change the parameter's type to refer it more directly,
this could make the memcpy not needed anymore.

in the function nbd_read_stat where nbd_find_request is only once called,
the parameter served should be transformed accordingly.

Signed-off-by: Denis Cheng <crquan@...il.com>
---
 drivers/block/nbd.c |    7 ++-----
 1 files changed, 2 insertions(+), 5 deletions(-)

diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
index 86639c0..a4d8508 100644
--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c
@@ -235,14 +235,11 @@ error_out:
 	return 1;
 }
 
-static struct request *nbd_find_request(struct nbd_device *lo, char *handle)
+static struct request *nbd_find_request(struct nbd_device *lo, struct request *xreq)
 {
 	struct request *req, *n;
-	struct request *xreq;
 	int err;
 
-	memcpy(&xreq, handle, sizeof(xreq));
-
 	err = wait_event_interruptible(lo->active_wq, lo->active_req != xreq);
 	if (unlikely(err))
 		goto out;
@@ -297,7 +294,7 @@ static struct request *nbd_read_stat(struct nbd_device *lo)
 		goto harderror;
 	}
 
-	req = nbd_find_request(lo, reply.handle);
+	req = nbd_find_request(lo, *(struct request **)reply.handle);
 	if (unlikely(IS_ERR(req))) {
 		result = PTR_ERR(req);
 		if (result != -ENOENT)
-- 
1.5.2.2

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