linux-kernel - [PATCH RFC] staging: comedi: dt282x: condition with no effect

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Message-Id: <1422967091-14798-1-git-send-email-hofrat@osadl.org>
Date:	Tue,  3 Feb 2015 07:38:10 -0500
From:	Nicholas Mc Guire <hofrat@...dl.org>
To:	Ian Abbott <abbotti@....co.uk>
Cc:	H Hartley Sweeten <hsweeten@...ionengravers.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
	Nicholas Mc Guire <hofrat@...dl.org>
Subject: [PATCH RFC] staging: comedi: dt282x: condition with no effect - if identical to else

The if and the else branch code are identical - so the condition has no
effect on the effective code - this patch removes the condition and the
duplicated code.

Signed-off-by: Nicholas Mc Guire <hofrat@...dl.org>
---

The if and else branch are identical code thus the condition has no effect

    if (cmd->scan_begin_src == TRIG_FOLLOW) {
            /* internal trigger */
            err |= cfc_check_trigger_arg_is(&cmd->scan_begin_arg, 0);
    } else {
            /* external trigger */
            /* should be level/edge, hi/lo specification here */
            err |= cfc_check_trigger_arg_is(&cmd->scan_begin_arg, 0);
    }

As the comments indicate that they are serving different purposes this
looks like a bug. In any case - if intentional - it would need some
comments on why.

This needs a review by someone that knows the details of this driver.
Also not sure about the retained comment string if that is still valid now.

Patch was only compile tested for x86_64_defconfig + CONFIG_STAGING=y
CONFIG_COMEDI=m, COMEDI_ISA_DRIVERS=y, CONFIG_COMEDI_DT282X=m

Patch is against 3.0.19-rc7 (localversion = -next-20150203)

 drivers/staging/comedi/drivers/dt282x.c |   10 ++--------
 1 file changed, 2 insertions(+), 8 deletions(-)

diff --git a/drivers/staging/comedi/drivers/dt282x.c b/drivers/staging/comedi/drivers/dt282x.c
index 051dfb2..22c59e5 100644
--- a/drivers/staging/comedi/drivers/dt282x.c
+++ b/drivers/staging/comedi/drivers/dt282x.c
@@ -685,14 +685,8 @@ static int dt282x_ai_cmdtest(struct comedi_device *dev,
 
 	err |= cfc_check_trigger_arg_is(&cmd->start_arg, 0);
 
-	if (cmd->scan_begin_src == TRIG_FOLLOW) {
-		/* internal trigger */
-		err |= cfc_check_trigger_arg_is(&cmd->scan_begin_arg, 0);
-	} else {
-		/* external trigger */
-		/* should be level/edge, hi/lo specification here */
-		err |= cfc_check_trigger_arg_is(&cmd->scan_begin_arg, 0);
-	}
+	/* internal trigger */
+	err |= cfc_check_trigger_arg_is(&cmd->scan_begin_arg, 0);
 
 	err |= cfc_check_trigger_arg_min(&cmd->convert_arg, 4000);
 
-- 
1.7.10.4

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