linux-kernel - [PATCH 3.10 180/180] spi: spi-xilinx: cleanup a check in xilinx_spi_txrx

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Message-Id: <1471793510-13022-181-git-send-email-w@1wt.eu>
Date:   Sun, 21 Aug 2016 17:31:50 +0200
From:   Willy Tarreau <w@....eu>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     "dan.carpenter@...cle.com" <dan.carpenter@...cle.com>,
        Mark Brown <broonie@...aro.org>, Willy Tarreau <w@....eu>
Subject: [PATCH 3.10 180/180] spi: spi-xilinx: cleanup a check in xilinx_spi_txrx_bufs()

From: "dan.carpenter@...cle.com" <dan.carpenter@...cle.com>

commit e33d085d11e54bc9fb07b2555cd104d8e7b3089b upstream.

'!' has higher precedence than comparisons so the original condition
is equivalent to "if (xspi->remaining_bytes == 0)".  This makes the
static checkers complain.

xspi->remaining_bytes is signed and from looking at the code
briefly, I think it might be able to go negative.  I suspect that
going negative may cause a bug, but I don't have the hardware and
can't test.

Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Mark Brown <broonie@...aro.org>
Signed-off-by: Willy Tarreau <w@....eu>
---
 drivers/spi/spi-xilinx.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/spi/spi-xilinx.c b/drivers/spi/spi-xilinx.c
index 34d18dc..109a535 100644
--- a/drivers/spi/spi-xilinx.c
+++ b/drivers/spi/spi-xilinx.c
@@ -315,7 +315,7 @@ static int xilinx_spi_txrx_bufs(struct spi_device *spi, struct spi_transfer *t)
 		}
 
 		/* See if there is more data to send */
-		if (!xspi->remaining_bytes > 0)
+		if (xspi->remaining_bytes <= 0)
 			break;
 	}
 
-- 
2.8.0.rc2.1.gbe9624a