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From: Dan Carpenter <dan.carpenter@oracle.com>, Peter Crosthwaite <peter.crosthwaite@p
To: Mark Brown <broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Cc: devicetree-discuss-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org,
	kernel-janitors-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	Michal Simek
	<michal.simek-gjFFaj9aHVfQT0dZR+AlfA@public.gmane.org>,
	Rob Herring <rob.herring-bsGFqQB8/DxBDgjK7y7TUQ@public.gmane.org>,
	linux-spi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	Grant Likely
	<grant.likely-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
Subject: [patch -next] spi: spi-xilinx: cleanup a check in xilinx_spi_txrx_bufs()
Date: Sun, 09 Jun 2013 13:07:28 +0000	[thread overview]
Message-ID: <20130609130728.GA1442@debian> (raw)

'!' 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@oracle.com>

diff --git a/drivers/spi/spi-xilinx.c b/drivers/spi/spi-xilinx.c
index 0b8398c..fb56fcf 100644
--- a/drivers/spi/spi-xilinx.c
+++ b/drivers/spi/spi-xilinx.c
@@ -301,7 +301,7 @@ 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;
 	}
 

WARNING: multiple messages have this Message-ID (diff)
From: Dan Carpenter <dan.carpenter-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>, Peter Crosthwaite <peter.crosthwaite-g5w7nrANp4BDPfheJLI6IQ@public.gmane.org>
To: Mark Brown <broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Cc: devicetree-discuss-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org,
	kernel-janitors-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	Michal Simek
	<michal.simek-gjFFaj9aHVfQT0dZR+AlfA@public.gmane.org>,
	Rob Herring <rob.herring-bsGFqQB8/DxBDgjK7y7TUQ@public.gmane.org>,
	linux-spi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	Grant Likely
	<grant.likely-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
Subject: [patch -next] spi: spi-xilinx: cleanup a check in xilinx_spi_txrx_bufs()
Date: Sun, 9 Jun 2013 16:07:28 +0300	[thread overview]
Message-ID: <20130609130728.GA1442@debian> (raw)

'!' 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-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>

diff --git a/drivers/spi/spi-xilinx.c b/drivers/spi/spi-xilinx.c
index 0b8398c..fb56fcf 100644
--- a/drivers/spi/spi-xilinx.c
+++ b/drivers/spi/spi-xilinx.c
@@ -301,7 +301,7 @@ 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;
 	}

             reply	other threads:[~2013-06-09 13:07 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-06-09 13:07 Dan Carpenter, Peter Crosthwaite [this message]
2013-06-09 13:07 ` [patch -next] spi: spi-xilinx: cleanup a check in xilinx_spi_txrx_bufs() Dan Carpenter, Peter Crosthwaite
2013-06-10  9:28 ` Mark Brown
2013-06-10  9:28   ` Mark Brown

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