linux-kernel - Re: [PATCH 6/9] staging: panel: Make two more module params read-only

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Message-ID: <20141118212034.GI26514@1wt.eu>
Date:	Tue, 18 Nov 2014 22:20:34 +0100
From:	Willy Tarreau <w@....eu>
To:	Mariusz Gorski <marius.gorski@...il.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 6/9] staging: panel: Make two more module params read-only

On Tue, Nov 18, 2014 at 09:56:11PM +0100, Mariusz Gorski wrote:
> Make keypad_type and lcd_type module params read-only.
> This step also starts making it more clear what is
> the precedence of device params coming from different
> sources (device profile, runtime module param values etc).
> 
> Signed-off-by: Mariusz Gorski <marius.gorski@...il.com>
> ---
>  drivers/staging/panel/panel.c | 71 ++++++++++++++++++++++---------------------
>  1 file changed, 37 insertions(+), 34 deletions(-)
> 
> diff --git a/drivers/staging/panel/panel.c b/drivers/staging/panel/panel.c
> index 7f2f5f8..5b4f0a4 100644
> --- a/drivers/staging/panel/panel.c
> +++ b/drivers/staging/panel/panel.c
> @@ -229,6 +229,9 @@ static struct {
>  	bool enabled;
>  } lcd;
>  
> +/* Needed only for init */
> +static int selected_lcd_type = NOT_SET;
> +
>  /* contains the LCD config state */
>  static unsigned long int lcd_flags;
>  /* contains the LCD X offset */
> @@ -1417,7 +1420,7 @@ static void panel_lcd_print(const char *s)
>  /* initialize the LCD driver */
>  static void lcd_init(void)
>  {
> -	switch (lcd_type) {
> +	switch (selected_lcd_type) {

(...)

stupid question : why not move that to the lcd struct you just
created instead of creating a new variable ? It would make sense
to me to have lcd.type here just like you did with enabled.
Same for keypad.

Willy

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