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From: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
To: unlisted-recipients:; (no To-header on input)
Cc: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>,
	linux-media@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH 07/38] media: tda10021: avoid casts when using symbol_rate
Date: Wed,  2 Sep 2020 18:10:10 +0200	[thread overview]
Message-ID: <316f5e497a02dc245953134f22cfb70aa67ccd26.1599062230.git.mchehab+huawei@kernel.org> (raw)
In-Reply-To: <cover.1599062230.git.mchehab+huawei@kernel.org>

The usage of castings and float point when checking for
the setup based at the symbol_rate cause those warnings
with smatch:

	drivers/media/dvb-frontends/tda10021.c:153 tda10021_set_symbolrate() warn: unsigned 'symbolrate' is never less than zero.
	drivers/media/dvb-frontends/tda10021.c:155 tda10021_set_symbolrate() warn: unsigned 'symbolrate' is never less than zero.
	drivers/media/dvb-frontends/tda10021.c:157 tda10021_set_symbolrate() warn: unsigned 'symbolrate' is never less than zero.
	drivers/media/dvb-frontends/tda10021.c:159 tda10021_set_symbolrate() warn: unsigned 'symbolrate' is never less than zero.

While the code should work with gcc, as it will evaluate the
values into a constant before compiling, other compilers
could do otherwise. So, get rid of float pointing math on it,
avoiding the need of doing typecasts.

While here, cleanup some coding style issues at the related
code.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
---
 drivers/media/dvb-frontends/tda10021.c | 38 ++++++++++++++++----------
 1 file changed, 24 insertions(+), 14 deletions(-)

diff --git a/drivers/media/dvb-frontends/tda10021.c b/drivers/media/dvb-frontends/tda10021.c
index 9fb207b41576..faa6e54b3372 100644
--- a/drivers/media/dvb-frontends/tda10021.c
+++ b/drivers/media/dvb-frontends/tda10021.c
@@ -137,26 +137,36 @@ static int tda10021_set_symbolrate (struct tda10021_state* state, u32 symbolrate
 {
 	s32 BDR;
 	s32 BDRI;
-	s16 SFIL=0;
+	s16 SFIL = 0;
 	u16 NDEC = 0;
 	u32 tmp, ratio;
 
-	if (symbolrate > XIN/2)
-		symbolrate = XIN/2;
-	if (symbolrate < 500000)
+	if (symbolrate > XIN / 2)
+		symbolrate = XIN / 2;
+	else if (symbolrate < 500000)
 		symbolrate = 500000;
 
-	if (symbolrate < XIN/16) NDEC = 1;
-	if (symbolrate < XIN/32) NDEC = 2;
-	if (symbolrate < XIN/64) NDEC = 3;
+	if (symbolrate < XIN / 16)
+		NDEC = 1;
+	if (symbolrate < XIN / 32)
+		NDEC = 2;
+	if (symbolrate < XIN / 64)
+		NDEC = 3;
 
-	if (symbolrate < (u32)(XIN/12.3)) SFIL = 1;
-	if (symbolrate < (u32)(XIN/16))	 SFIL = 0;
-	if (symbolrate < (u32)(XIN/24.6)) SFIL = 1;
-	if (symbolrate < (u32)(XIN/32))	 SFIL = 0;
-	if (symbolrate < (u32)(XIN/49.2)) SFIL = 1;
-	if (symbolrate < (u32)(XIN/64))	 SFIL = 0;
-	if (symbolrate < (u32)(XIN/98.4)) SFIL = 1;
+	if (symbolrate < XIN * 10 / 123)
+		SFIL = 1;
+	if (symbolrate < XIN * 10 / 160)
+		SFIL = 0;
+	if (symbolrate < XIN * 10 / 246)
+		SFIL = 1;
+	if (symbolrate < XIN * 10 / 320)
+		SFIL = 0;
+	if (symbolrate < XIN * 10 / 492)
+		SFIL = 1;
+	if (symbolrate < XIN * 10 / 640)
+		SFIL = 0;
+	if (symbolrate < XIN * 10 / 984)
+		SFIL = 1;
 
 	symbolrate <<= NDEC;
 	ratio = (symbolrate << 4) / FIN;
-- 
2.26.2


  parent reply	other threads:[~2020-09-02 16:17 UTC|newest]

Thread overview: 47+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-02 16:10 [PATCH 00/38] media sparse/smatch warn fixes Mauro Carvalho Chehab
2020-09-02 16:10 ` [PATCH 01/38] media: tda10086: cleanup symbol_rate setting logic Mauro Carvalho Chehab
2020-09-02 16:10 ` [PATCH 02/38] media: v4l2-ioctl: avoid memory leaks on some time32 compat functions Mauro Carvalho Chehab
2020-09-02 16:26   ` Laurent Pinchart
2020-09-02 18:45   ` Arnd Bergmann
2020-09-03  6:01     ` Mauro Carvalho Chehab
2020-09-02 16:10 ` [PATCH 03/38] media: qt1010: fix usage of unititialized value Mauro Carvalho Chehab
2020-09-02 16:10 ` [PATCH 04/38] media: av7110_v4l: avoid a typecast Mauro Carvalho Chehab
2020-09-02 16:10 ` [PATCH 05/38] media: wl128x: get rid of a potential spectre issue Mauro Carvalho Chehab
2020-09-02 16:10 ` [PATCH 06/38] media: venus: place extern venus_fw_debug on a header file Mauro Carvalho Chehab
2020-09-10 10:45   ` Stanimir Varbanov
2020-09-02 16:10 ` Mauro Carvalho Chehab [this message]
2020-09-02 16:10 ` [PATCH 08/38] media: serial_ir: use the right type for a dma address Mauro Carvalho Chehab
2020-09-02 16:10 ` [PATCH 09/38] media: vivid: move the detection part out of vivid_create_instance Mauro Carvalho Chehab
2020-09-02 16:10 ` [PATCH 10/38] media: vivid: place the logic which disables ioctl on a separate function Mauro Carvalho Chehab
2020-09-02 16:10 ` [PATCH 11/38] media: vivid: move set_capabilities logic to " Mauro Carvalho Chehab
2020-09-02 16:10 ` [PATCH 12/38] media: vivid: place dt timings init code on " Mauro Carvalho Chehab
2020-09-02 16:10 ` [PATCH 13/38] media: vivid: move the create queues to " Mauro Carvalho Chehab
2020-09-02 16:10 ` [PATCH 14/38] media: vivid: move the devnode creation logic " Mauro Carvalho Chehab
2020-09-02 21:57   ` kernel test robot
2020-09-03  0:31   ` kernel test robot
2020-09-02 16:10 ` [PATCH 15/38] media: vivid: fix error path Mauro Carvalho Chehab
2020-09-02 16:10 ` [PATCH 16/38] media: videobuf-dma-sg: number of pages should be unsigned long Mauro Carvalho Chehab
2020-09-03  7:49   ` John Hubbard
2020-09-02 16:10 ` [PATCH 17/38] media: cx25821-alsa: " Mauro Carvalho Chehab
2020-09-02 16:10 ` [PATCH 18/38] media: cx23885-alsa: " Mauro Carvalho Chehab
2020-09-02 16:10 ` [PATCH 19/38] media: cx88-alsa: " Mauro Carvalho Chehab
2020-09-02 16:10 ` [PATCH 20/38] media: saa7134-alsa.c: " Mauro Carvalho Chehab
2020-09-02 16:10 ` [PATCH 21/38] media: dvb-ttusb-budget: don't use stack for USB transfers Mauro Carvalho Chehab
2020-09-02 16:10 ` [PATCH 22/38] media: dvb-ttusb-budget: cleanup printk logic Mauro Carvalho Chehab
2020-09-02 16:10 ` [PATCH 23/38] media: saa7134: avoid a shift overflow Mauro Carvalho Chehab
2020-09-02 16:10 ` [PATCH 24/38] media: atomisp: fix casts at atomisp_compat_ioctl32.c Mauro Carvalho Chehab
2020-09-02 16:10 ` [PATCH 25/38] media: atomisp: get rid of some unused code Mauro Carvalho Chehab
2020-09-02 16:10 ` [PATCH 26/38] media: atomisp: cleanup ifdefs from ia_css_debug.c Mauro Carvalho Chehab
2020-09-02 16:10 ` [PATCH 27/38] media: atomisp: get rid of version-dependent globals Mauro Carvalho Chehab
2020-09-02 16:10 ` [PATCH 28/38] media: atomisp: get rid of isys_dma.h and isys_dma_local.h Mauro Carvalho Chehab
2020-09-02 16:10 ` [PATCH 29/38] media: atomisp: get rid of ibuf_ctrl abstraction Mauro Carvalho Chehab
2020-09-02 16:10 ` [PATCH 30/38] media: atomisp: don't check for ISP version for includes Mauro Carvalho Chehab
2020-09-02 16:10 ` [PATCH 31/38] media: atomisp: unify INPUT error return type Mauro Carvalho Chehab
2020-09-02 16:10 ` [PATCH 32/38] media: atomisp: de-duplicate names at *_input_system_global.h Mauro Carvalho Chehab
2020-09-02 16:10 ` [PATCH 33/38] media: atomisp: reorder functions at pixelgen_private.h Mauro Carvalho Chehab
2020-09-02 16:10 ` [PATCH 34/38] media: atomisp: remove compile-time tests from input_system_global.h Mauro Carvalho Chehab
2020-09-02 16:10 ` [PATCH 35/38] media: atomisp: fix some bad indents Mauro Carvalho Chehab
2020-09-02 16:10 ` [PATCH 36/38] media: atomisp: csi_rx.c: add a missing includes Mauro Carvalho Chehab
2020-09-02 16:10 ` [PATCH 37/38] media: atomisp: atomisp_gmin_platform: check before use Mauro Carvalho Chehab
2020-09-02 16:10 ` [PATCH 38/38] media: atomisp: cleanup isys_irq headers Mauro Carvalho Chehab
2020-09-07 10:17 ` [PATCH 00/38] media sparse/smatch warn fixes Hans Verkuil

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