linux-kernel - [PATCH] Fix missing 'cnt' in ?: in dmatest

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Date:	Sun, 21 Aug 2011 01:50:31 +0100
From:	"Dr. David Alan Gilbert" <linux@...blig.org>
To:	linux-kernel@...r.kernel.org
Cc:	nicolas.ferre@...el.com, dan.j.williams@...el.com,
	akpm@...ux-foundation.org
Subject: [PATCH] Fix missing 'cnt' in ?: in dmatest

Hi,
  On the latest tree my compiler has started giving the warning:

drivers/dma/dmatest.c:575:28: warning: the omitted middle operand in ?: will always be ?true?, suggest explicit middle operand [-Wparentheses]

The following patch fixes the missing middle clause with the same
fix that Nicolas Ferre used in the similar clauses.
(There seems to have been a race between him fixing that and
the extra clause going in a little later).

I don't actually know the dmatest code/structures, nor do I own
any hardware to test it on (assuming it needs a DMA engine);
 but this patch builds, the existing code is almost certainly
wrong and the fix is the same as the corresponding lines above it.

(WTH is x=y?:z legal C anyway?)

Signed-off-by: Dr. David Alan Gilbert <linux@...blig.org>

---
diff --git a/drivers/dma/dmatest.c b/drivers/dma/dmatest.c
index 765f5ff..1b0ec9d 100644
--- a/drivers/dma/dmatest.c
+++ b/drivers/dma/dmatest.c
@@ -572,7 +572,7 @@ static int dmatest_add_channel(struct dma_chan *chan)
 	}
 	if (dma_has_cap(DMA_PQ, dma_dev->cap_mask)) {
 		cnt = dmatest_add_threads(dtc, DMA_PQ);
-		thread_count += cnt > 0 ?: 0;
+		thread_count += cnt > 0 ? cnt : 0;
 	}
 
 	pr_info("dmatest: Started %u threads using %s\n",

-- 
 -----Open up your eyes, open up your mind, open up your code -------   
/ Dr. David Alan Gilbert    |       Running GNU/Linux       | Happy  \ 
\ gro.gilbert @ treblig.org |                               | In Hex /
 \ _________________________|_____ http://www.treblig.org   |_______/
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