linux-kernel - Re: [PATCH] Fix line too long warning

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Date:   Sun, 29 Oct 2017 08:19:42 -0700
From:   Joe Perches <joe@...ches.com>
To:     Kien Ha <kienha9922@...il.com>, linux-kernel@...r.kernel.org,
        devel@...verdev.osuosl.org
Subject: Re: [PATCH] Fix line too long warning

On Sat, 2017-10-28 at 22:46 -0400, Kien Ha wrote:
> From fc52a98aca0c033f2c03fdc7e8f83ae49625675a Mon Sep 17 00:00:00 2001
> From: Kien Ha <kienha9922@...il.com>
> Date: Fri, 27 Oct 2017 14:07:55 -0400
> Subject: [PATCH] Fix line too long warning
> 
> Signed-off-by: Kien Ha <kienha9922@...il.com>

Hi.

Instead of merely shutting up checkpatch warnings,
always try to improve the code instead.

Look at the flow of this cascaded if / else { if
and transform it to a simpler if ... else if ... else if ...

                       if (sta && sta->vht_cap.vht_supported) {
                               tcb_desc->hw_rate =
                               _rtl_get_vht_highest_n_rate(hw, sta);
                       } else {
                               if (sta && (sta->ht_cap.ht_supported)) {
                                       tcb_desc->hw_rate =
                                           _rtl_get_highest_n_rate(hw, sta);
                               } else {
                                       if (rtlmac->mode == WIRELESS_MODE_B) {
                                               tcb_desc->hw_rate =
                                                   rtlpriv->cfg->maps[RTL_RC_CCK_RATE11M];
                                       } else {
                                               tcb_desc->hw_rate =
                                                   rtlpriv->cfg->maps[RTL_RC_OFDM_RATE54M];
                                       }
                               }
                       }


This block could be

		tcb_desc->hw_rate =
			sta && sta->vht_cap.vht_supported ?
				_rtl_get_vht_highest_n_rate(hw, sta) :
			sta && sta->ht_cap.ht_supported ?
				_rtl_get_highest_n_rate(hw, sta) :
			rtlmac->mode == WIRELESS_MODE_B ?
				rtlpriv->cfg->maps[RTL_RC_CCK_RATE11M] :
				rtlpriv->cfg->maps[RTL_RC_OFDM_RATE54M];

which seems easier to read.