[PATCH 11/16] board: stm32mp1: check env_get result in board_late_init

[Wolfgang Denk]

Dear Patrick Delaunay,

In message <20200331180330.11.Ic051e25812481db408f2431c7962da1db1f198fb at changeid> you wrote:
> This patch avoids crash in strcmp when the boot_device is not
> present in environment (this case should be never occur)
>
> Signed-off-by: Patrick Delaunay <patrick.delaunay at st.com>
> ---
>
>  board/st/stm32mp1/stm32mp1.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/board/st/stm32mp1/stm32mp1.c b/board/st/stm32mp1/stm32mp1.c
> index 89a088cd28..fff4cef2c2 100644
> --- a/board/st/stm32mp1/stm32mp1.c
> +++ b/board/st/stm32mp1/stm32mp1.c
> @@ -753,7 +753,8 @@ int board_late_init(void)
>  
>  	/* Check the boot-source to disable bootdelay */
>  	boot_device = env_get("boot_device");
> -	if (!strcmp(boot_device, "serial") || !strcmp(boot_device, "usb"))
> +	if (boot_device &&
> +	    (!strcmp(boot_device, "serial") || !strcmp(boot_device, "usb")))
>  		env_set("bootdelay", "0");

I think this is generally a bad idea.  You should have more respect
to the intentions of your users.  If a user defines a specific
bootdelay setting in his environment, this must be respected.

I really hate vendors who believe they know better than me what I
want or what is good to me.  Please get rid of such stuff.

"bootdelay" is an environment variable that is intentionally user
definable. You must never mess with those.

Best regards,

Wolfgang Denk

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