linux-kernel - [PATCH] spi: atmel: fix incorrect comparison

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Date:	Tue,  6 May 2014 17:44:41 +0200
From:	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
To:	Mark Brown <broonie@...nel.org>
Cc:	Nicolas Ferre <nicolas.ferre@...el.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-spi@...r.kernel.org,
	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
Subject: [PATCH] spi: atmel: fix incorrect comparison

Found using smatch:
drivers/spi/spi-atmel.c:878 atmel_spi_pump_pio_data() warn: unsigned
'as->current_remaining_bytes' is never less than zero.

Signed-off-by: Alexandre Belloni <alexandre.belloni@...e-electrons.com>
---
 drivers/spi/spi-atmel.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/spi/spi-atmel.c b/drivers/spi/spi-atmel.c
index 079e6b1b0cdb..39417fd8462f 100644
--- a/drivers/spi/spi-atmel.c
+++ b/drivers/spi/spi-atmel.c
@@ -874,8 +874,9 @@ atmel_spi_pump_pio_data(struct atmel_spi *as, struct spi_transfer *xfer)
 		spi_readl(as, RDR);
 	}
 	if (xfer->bits_per_word > 8) {
-		as->current_remaining_bytes -= 2;
-		if (as->current_remaining_bytes < 0)
+		if (as->current_remaining_bytes > 2)
+			as->current_remaining_bytes -= 2;
+		else
 			as->current_remaining_bytes = 0;
 	} else {
 		as->current_remaining_bytes--;
-- 
1.9.1

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