linux-kernel - Re: [PATCH 2/3] usb: storage: realtek_cr: Simplify residue calculation in rts51x_bulk

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Message-ID: <b0c0ed47-b524-48c8-84c9-7da02f7f7d30@rowland.harvard.edu>
Date: Wed, 13 Aug 2025 10:00:06 -0400
From: Alan Stern <stern@...land.harvard.edu>
To: Thorsten Blum <thorsten.blum@...ux.dev>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-usb@...r.kernel.org, usb-storage@...ts.one-eyed-alien.net,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] usb: storage: realtek_cr: Simplify residue
 calculation in rts51x_bulk_transport()

On Wed, Aug 13, 2025 at 12:12:49PM +0200, Thorsten Blum wrote:
> Simplify the calculation of 'residue' in rts51x_bulk_transport() and
> avoid unnecessarily reassigning 'residue' to itself.
> 
> Signed-off-by: Thorsten Blum <thorsten.blum@...ux.dev>
> ---
>  drivers/usb/storage/realtek_cr.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/usb/storage/realtek_cr.c b/drivers/usb/storage/realtek_cr.c
> index d2c3e3a39693..8a4d7c0f2662 100644
> --- a/drivers/usb/storage/realtek_cr.c
> +++ b/drivers/usb/storage/realtek_cr.c
> @@ -261,8 +261,8 @@ static int rts51x_bulk_transport(struct us_data *us, u8 lun,
>  	 * try to compute the actual residue, based on how much data
>  	 * was really transferred and what the device tells us
>  	 */
> -	if (residue)
> -		residue = residue < buf_len ? residue : buf_len;
> +	if (residue > buf_len)
> +		residue = buf_len;
>  
>  	if (act_len)
>  		*act_len = buf_len - residue;

Acked-by: Alan Stern <stern@...land.harvard.edu>