linux-kernel - [PATCH] iio: adc: ina2xx: Use 64-bit arithmetic instead of 32-bit

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Message-ID: <20180213165258.GA12967@embeddedor.com>
Date:   Tue, 13 Feb 2018 10:52:58 -0600
From:   "Gustavo A. R. Silva" <garsilva@...eddedor.com>
To:     Jonathan Cameron <jic23@...nel.org>,
        Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>
Cc:     linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
        "Gustavo A. R. Silva" <garsilva@...eddedor.com>
Subject: [PATCH] iio: adc: ina2xx: Use 64-bit arithmetic instead of 32-bit

Add suffix ULL to constant 1000 in order to give the compiler complete
information about the proper arithmetic to use. Notice that this
constant is used in a context that expects an expression of type
u64 (64 bits, unsigned).

The expression 1000 * sampling_us is currently being evaluated
using 32-bit arithmetic.

Addresses-Coverity-ID: 1463793
Signed-off-by: Gustavo A. R. Silva <garsilva@...eddedor.com>
---
 drivers/iio/adc/ina2xx-adc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iio/adc/ina2xx-adc.c b/drivers/iio/adc/ina2xx-adc.c
index 0635a79..8649700 100644
--- a/drivers/iio/adc/ina2xx-adc.c
+++ b/drivers/iio/adc/ina2xx-adc.c
@@ -810,7 +810,7 @@ static int ina2xx_capture_thread(void *data)
 		 * multiple times, i.e. samples are dropped.
 		 */
 		do {
-			timespec64_add_ns(&next, 1000 * sampling_us);
+			timespec64_add_ns(&next, 1000ULL * sampling_us);
 			delta = timespec64_sub(next, now);
 			delay_us = div_s64(timespec64_to_ns(&delta), 1000);
 		} while (delay_us <= 0);
-- 
2.7.4