linux-kernel - drivers/gpu/drm/bridge/fsl-ldb.c:101: possible loss of information.

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Date:   Tue, 7 Mar 2023 16:45:24 +0000
From:   David Binderman <dcb314@...mail.com>
To:     "andrzej.hajda@...el.com" <andrzej.hajda@...el.com>,
        "neil.armstrong@...aro.org" <neil.armstrong@...aro.org>,
        "rfoss@...nel.org" <rfoss@...nel.org>,
        "Laurent.pinchart@...asonboard.com" 
        <Laurent.pinchart@...asonboard.com>,
        "jonas@...boo.se" <jonas@...boo.se>,
        "jernej.skrabec@...il.com" <jernej.skrabec@...il.com>,
        "airlied@...il.com" <airlied@...il.com>,
        "daniel@...ll.ch" <daniel@...ll.ch>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: drivers/gpu/drm/bridge/fsl-ldb.c:101: possible loss of information.

Hello there,

I just ran the static analyser "cppcheck" over the source code of linux-6.2-rc1. It said:

linux-6.3-rc1/drivers/gpu/drm/bridge/fsl-ldb.c:101:3: style: int result is returned as long value. If the return value is long to avoid loss of information, then you have loss of information. [truncLongCastReturn]

Source code is

static unsigned long fsl_ldb_link_frequency(struct fsl_ldb *fsl_ldb, int clock)
{
    if (fsl_ldb->lvds_dual_link)
        return clock * 3500;
    else
        return clock * 7000;
}

Depending on the range of the value of clock, maybe unsigned long literals, like 3500UL, should
have been used ?

Regards

David Binderman