linux-kernel - Re: [RFC PATCH 2/4] power: reset: reboot-mode: Wire reboot

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Date:   Tue, 25 Jul 2023 15:33:57 +0530
From:   Mukesh Ojha <quic_mojha@...cinc.com>
To:     Elliot Berman <quic_eberman@...cinc.com>,
        Mark Rutland <mark.rutland@....com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        "Sebastian Reichel" <sre@...nel.org>
CC:     Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <linux-pm@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-msm@...r.kernel.org>, <kernel@...cinc.com>,
        "Satya Durga Srinivasu Prabhala" <quic_satyap@...cinc.com>,
        Melody Olvera <quic_molvera@...cinc.com>,
        Prasad Sodagudi <quic_psodagud@...cinc.com>
Subject: Re: [RFC PATCH 2/4] power: reset: reboot-mode: Wire reboot_mode enum
 to magic



On 7/25/2023 4:00 AM, Elliot Berman wrote:
> Allow the reboot mode type to be wired to magic.
> 
> Signed-off-by: Elliot Berman <quic_eberman@...cinc.com>
> ---
>   drivers/power/reset/reboot-mode.c | 30 ++++++++++++++++++++++++++----
>   1 file changed, 26 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/power/reset/reboot-mode.c b/drivers/power/reset/reboot-mode.c
> index a646aefa041b..4ea97ccbaf51 100644
> --- a/drivers/power/reset/reboot-mode.c
> +++ b/drivers/power/reset/reboot-mode.c
> @@ -22,12 +22,8 @@ struct mode_info {
>   static bool get_reboot_mode_magic(struct reboot_mode_driver *reboot,
>   					  const char *cmd, unsigned int *magic)
>   {
> -	const char *normal = "normal";
>   	struct mode_info *info;
>   
> -	if (!cmd)
> -		cmd = normal;
> -
>   	list_for_each_entry(info, &reboot->head, list) {
>   		if (!strcmp(info->mode, cmd)) {
>   			*magic = info->magic;
> @@ -45,6 +41,32 @@ static int reboot_mode_notify(struct notifier_block *this,
>   	unsigned int magic;
>   
>   	reboot = container_of(this, struct reboot_mode_driver, reboot_notifier);
> +
> +	if (!cmd) {
> +		switch (mode) {

IIUC, mode will be filled up with reboot_mode during restart
notifier and not reboot notifiers ?

> +		case REBOOT_COLD:
> +			cmd = "cold";
> +			break;
> +		case REBOOT_WARM:
> +			cmd = "warm";
> +			break;
> +		case REBOOT_HARD:
> +			cmd = "hard";
> +			break;
> +		case REBOOT_SOFT:
> +			cmd = "soft";
> +			break;
> +		case REBOOT_GPIO:
> +			cmd = "gpio";

These strings are already there kernel/reboot.c
Can it be reused ?

#define REBOOT_COLD_STR         "cold"
#define REBOOT_WARM_STR         "warm"
#define REBOOT_HARD_STR         "hard"
#define REBOOT_SOFT_STR         "soft"
#define REBOOT_GPIO_STR         "gpio"
#define REBOOT_UNDEFINED_STR    "undefined"


> +			break;
> +		}
> +		if (get_reboot_mode_magic(reboot, cmd, &magic)) {

Is info->mode is going to filled up with mode-cold, mode-warm and so
on from DT to compare against cmd?

What if , cmd is not among the one above switch, NULL pointer during
strcmp ?

-Mukesh

> +			reboot->write(reboot, magic);
> +			return NOTIFY_DONE;
> +		}
> +		cmd = "normal";
> +	}
> +
>   	if (get_reboot_mode_magic(reboot, cmd, &magic))
>   		reboot->write(reboot, magic);
>