linux-kernel - Re: [PATCH v2 2/3] floppy: add defines for sizes of cmd & reply buffers of floppy_raw

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Date:   Sun, 26 Apr 2020 13:28:14 -0700
From:   Joe Perches <joe@...ches.com>
To:     Denis Efremov <efremov@...ux.com>, linux-block@...r.kernel.org
Cc:     Willy Tarreau <w@....eu>, Christoph Hellwig <hch@...radead.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/3] floppy: add defines for sizes of cmd & reply
 buffers of floppy_raw_cmd

On Sun, 2020-04-26 at 16:07 +0300, Denis Efremov wrote:
> Use FD_RAW_CMD_SIZE, FD_RAW_REPLY_SIZE defines instead of magic numbers
> for cmd & reply buffers of struct floppy_raw_cmd. Remove local to
> floppy.c MAX_REPLIES define, as it is now FD_RAW_REPLY_SIZE.
> FD_RAW_CMD_FULLSIZE added as we allow command to also fill reply_count
> and reply fields.
[]
> diff --git a/drivers/block/floppy.c b/drivers/block/floppy.c
[]
> @@ -1847,7 +1846,7 @@ static void show_floppy(int fdc)
>  			output_log[(i + output_log_pos) % OLOGSIZE].jiffies);
>  	pr_info("last result at %lu\n", resultjiffies);
>  	pr_info("last redo_fd_request at %lu\n", lastredo);
> -	print_hex_dump(KERN_INFO, "", DUMP_PREFIX_NONE, 16, 1,
> +	print_hex_dump(KERN_INFO, "", DUMP_PREFIX_NONE, FD_RAW_REPLY_SIZE, 1,
>  		       reply_buffer, resultsize, true);

FD_RAW_REPLY_SIZE happens to be 16, but it's misleading
to use it here.

This use of 16 is not for FD_RAW_REPLY_SIZE, but the
width of the line
being dumped, and this value must be
either 16 or 32.