linux-kernel - Re: [PATCH 2/7] drivers/usb/gadget/amd5536udc.c: Remove double test

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Message-ID: <Pine.LNX.4.64.1008281846170.13508@ask.diku.dk>
Date:	Sat, 28 Aug 2010 18:48:56 +0200 (CEST)
From:	Julia Lawall <julia@...u.dk>
To:	Dan Carpenter <error27@...il.com>
Cc:	Thomas Dahlmann <dahlmann.thomas@...or.de>,
	kernel-janitors@...r.kernel.org,
	David Brownell <dbrownell@...rs.sourceforge.net>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	linux-geode@...ts.infradead.org, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/7] drivers/usb/gadget/amd5536udc.c: Remove double test

The same expression is tested twice and the result is the same each time.
Instead test for use_dma_ppb as in the test above.

The sematic match that finds this problem is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@expression@
expression E;
@@

(
* E
  || ... || E
|
* E
  && ... && E
)
// </smpl>

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

---
 drivers/usb/gadget/amd5536udc.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/gadget/amd5536udc.c b/drivers/usb/gadget/amd5536udc.c
index 731150d..6c40c99 100644
--- a/drivers/usb/gadget/amd5536udc.c
+++ b/drivers/usb/gadget/amd5536udc.c
@@ -203,7 +203,7 @@ static void print_regs(struct udc *dev)
 		DBG(dev, "DMA mode       = PPBNDU (packet per buffer "
 			"WITHOUT desc. update)\n");
 		dev_info(&dev->pdev->dev, "DMA mode (%s)\n", "PPBNDU");
-	} else if (use_dma && use_dma_ppb_du && use_dma_ppb_du) {
+	} else if (use_dma && use_dma_ppb && use_dma_ppb_du) {
 		DBG(dev, "DMA mode       = PPBDU (packet per buffer "
 			"WITH desc. update)\n");
 		dev_info(&dev->pdev->dev, "DMA mode (%s)\n", "PPBDU");

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