linux-kernel - Re: [PATCH][next] tty: serial: jsm: remove redundant assignments of several variables

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Date:   Thu, 22 Apr 2021 14:52:12 +0200
From:   Johan Hovold <johan@...nel.org>
To:     Colin King <colin.king@...onical.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        Lee Jones <lee.jones@...aro.org>, linux-serial@...r.kernel.org,
        kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH][next] tty: serial: jsm: remove redundant assignments of
 several variables

On Thu, Apr 22, 2021 at 01:11:15PM +0100, Colin King wrote:
> From: Colin Ian King <colin.king@...onical.com>
> 
> Several variables are being assigned with values that are never
> read and being updated later with a new value. The initializations
> are redundant and can be removed.
> 
> Addresses-Coverity: ("Unused value")
> Signed-off-by: Colin Ian King <colin.king@...onical.com>
> ---
>  drivers/tty/serial/jsm/jsm_cls.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/tty/serial/jsm/jsm_cls.c b/drivers/tty/serial/jsm/jsm_cls.c
> index b507a2cec926..b58ea4344aaf 100644
> --- a/drivers/tty/serial/jsm/jsm_cls.c
> +++ b/drivers/tty/serial/jsm/jsm_cls.c
> @@ -349,8 +349,8 @@ static void cls_assert_modem_signals(struct jsm_channel *ch)
>  
>  static void cls_copy_data_from_uart_to_queue(struct jsm_channel *ch)
>  {
> -	int qleft = 0;
> -	u8 linestatus = 0;
> +	int qleft;
> +	u8 linestatus;
>  	u8 error_mask = 0;
>  	u16 head;
>  	u16 tail;
> @@ -365,8 +365,6 @@ static void cls_copy_data_from_uart_to_queue(struct jsm_channel *ch)
>  	head = ch->ch_r_head & RQUEUEMASK;
>  	tail = ch->ch_r_tail & RQUEUEMASK;
>  
> -	/* Get our cached LSR */
> -	linestatus = ch->ch_cached_lsr;
>  	ch->ch_cached_lsr = 0;

Why leave this assignment in? Looks like this was all copy-pasta, but
this assignment makes even less sense now that you remove the comment
and load.

Johan