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Mon, 05 Oct 2020 08:05:00 -0700 Received: from [127.0.0.1] (helo=localhost) by smtp.xilinx.com with smtp (Exim 4.63) (envelope-from ) id 1kPS3R-0006yz-Eh; Mon, 05 Oct 2020 08:05:33 -0700 Received: from [172.19.2.102] (helo=xsjanandash50.xilinx.com) by xsj-pvapsmtp01 with esmtp (Exim 4.63) (envelope-from ) id 1kPS3J-0006wF-1T; Mon, 05 Oct 2020 08:05:25 -0700 From: Anand Ashok Dumbre To: jic23@kernel.org, knaack.h@gmx.de, lars@metafoo.de, pmeerw@pmeerw.net, michal.simek@xilinx.com, git@xilinx.com, linux-iio@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [LINUX PATCH v3] iio: core: Fix IIO_VAL_FRACTIONAL calculation for negative values Date: Mon, 5 Oct 2020 08:05:16 -0700 Message-Id: <1601910316-24111-1-git-send-email-anand.ashok.dumbre@xilinx.com> X-Mailer: git-send-email 2.7.4 X-TM-AS-Product-Ver: IMSS-7.1.0.1224-8.2.0.1013-23620.005 X-TM-AS-User-Approved-Sender: Yes;Yes X-EOPAttributedMessage: 0 X-MS-Office365-Filtering-HT: Tenant X-MS-PublicTrafficType: Email MIME-Version: 1.0 X-MS-Office365-Filtering-Correlation-Id: 5d65985b-8337-4837-7c25-08d869401bc6 X-MS-TrafficTypeDiagnostic: DM5PR02MB2636: X-Microsoft-Antispam-PRVS: X-Auto-Response-Suppress: DR, RN, NRN, OOF, AutoReply X-MS-Oob-TLC-OOBClassifiers: OLM:6108; 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Ip=[149.199.60.83]; Helo=[xsj-pvapsmtpgw01] X-MS-Exchange-CrossTenant-AuthSource: SN1NAM02FT026.eop-nam02.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR02MB2636 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201005_110542_849421_21C10D2D X-CRM114-Status: GOOD ( 13.68 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: anandash@xilinx.com, Anand Ashok Dumbre Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Fixes IIO_VAL_FRACTIONAL for case when the result is negative and exponent is 0. example: if the result is -0.75, tmp0 will be 0 and tmp1 = 75 This causes the output to lose sign because of %d in snprintf which works for tmp0 <= -1. Signed-off-by: Anand Ashok Dumbre Reported-by: kernel test robot #error: uninitialized symbol tmp Reported-by: Dan Carpenter --- Changes in v3: Fixed a bug caught by kernel test robot and used correct variable --- drivers/iio/industrialio-core.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c index cdcd16f1..ffd5176 100644 --- a/drivers/iio/industrialio-core.c +++ b/drivers/iio/industrialio-core.c @@ -592,6 +592,7 @@ static ssize_t __iio_format_value(char *buf, size_t len, unsigned int type, { unsigned long long tmp; int tmp0, tmp1; + s64 tmp2; bool scale_db = false; switch (type) { @@ -614,10 +615,13 @@ static ssize_t __iio_format_value(char *buf, size_t len, unsigned int type, else return scnprintf(buf, len, "%d.%09u", vals[0], vals[1]); case IIO_VAL_FRACTIONAL: - tmp = div_s64((s64)vals[0] * 1000000000LL, vals[1]); + tmp2 = div_s64((s64)vals[0] * 1000000000LL, vals[1]); tmp1 = vals[1]; - tmp0 = (int)div_s64_rem(tmp, 1000000000, &tmp1); - return scnprintf(buf, len, "%d.%09u", tmp0, abs(tmp1)); + tmp0 = (int)div_s64_rem(tmp2, 1000000000, &tmp1); + if ((tmp2 < 0) && (tmp0 == 0)) + return snprintf(buf, len, "-0.%09u", abs(tmp1)); + else + return snprintf(buf, len, "%d.%09u", tmp0, abs(tmp1)); case IIO_VAL_FRACTIONAL_LOG2: tmp = shift_right((s64)vals[0] * 1000000000LL, vals[1]); tmp0 = (int)div_s64_rem(tmp, 1000000000LL, &tmp1); -- 2.7.4 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel