linux-kernel - Re: [PATCH v2 03/11] block: sed-opal: unify cmd start and finalize

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Date:   Mon, 19 Mar 2018 20:57:00 +0100
From:   Christoph Hellwig <hch@....de>
To:     Jonas Rabenstein <jonas.rabenstein@...dium.uni-erlangen.de>
Cc:     Scott Bauer <scott.bauer@...el.com>,
        Jonathan Derrick <jonathan.derrick@...el.com>,
        Jens Axboe <axboe@...nel.dk>, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, Christoph Hellwig <hch@....de>
Subject: Re: [PATCH v2 03/11] block: sed-opal: unify cmd start and finalize

On Mon, Mar 19, 2018 at 07:36:45PM +0100, Jonas Rabenstein wrote:
> Every step starts with resetting the cmd buffer as well as the comid and
> constructs the appropriate OPAL_CALL command. Consequently, those
> actions may be combined into one generic function. On should take care,
> that the opening and closing tokens for the argument list are already
> emitted by those functions and thus must not be additionally added.
> 
> Signed-off-by: Jonas Rabenstein <jonas.rabenstein@...dium.uni-erlangen.de>
> 
> diff --git a/block/sed-opal.c b/block/sed-opal.c
> index 771b4cfff95c..efe5d2a7f3dc 100644
> --- a/block/sed-opal.c
> +++ b/block/sed-opal.c
> @@ -656,6 +656,9 @@ static int cmd_finalize(struct opal_dev *cmd, u32 hsn, u32 tsn)
>  	struct opal_header *hdr;
>  	int err = 0;
>  
> +	/* close the parameter list opened from start_opal_cmd */
> +	add_token_u8(&err, cmd, OPAL_ENDLIST);
> +
>  	add_token_u8(&err, cmd, OPAL_ENDOFDATA);
>  	add_token_u8(&err, cmd, OPAL_STARTLIST);
>  	add_token_u8(&err, cmd, 0);

I think this should be a separate patch, independent of the newly added
start_opal_cmd.


> @@ -998,6 +1001,26 @@ static void clear_opal_cmd(struct opal_dev *dev)
>  	memset(dev->cmd, 0, IO_BUFFER_LENGTH);
>  }
>  
> +static int start_opal_cmd(struct opal_dev *dev, const u8 *uid, const u8 *method)
> +{
> +	int err = 0;

start_opal_cmd and cmd_finalize don't really seem to match in terms
of naming.  I don't really care either way, but a little consistency
would be nice.

> +	/* every method call is followed by its parameters enclosed within
> +	 * OPAL_STARTLIST and OPAL_ENDLIST tokens. We automatically open the
> +	 * parameter list here and close it later in cmd_finalize
> +	 */

Normal Linux comment style would be:

	/*
	 * Every method call is followed by its parameters enclosed within
	 * OPAL_STARTLIST and OPAL_ENDLIST tokens. We automatically open the
	 * parameter list here and close it later in cmd_finalize.
	 */