Re: [PATCH v2 1/2] ARM: i.MX8M: bootrom-cmd: clean up pointer casting

[Sascha Hauer <sha@pengutronix.de>]

On Wed, Jan 11, 2023 at 04:28:36PM +0100, Ahmad Fatoum wrote:
> At first glance:
> 
> 	const u32 *rom_log_addr;
> 	kstrtoul(optarg, 0, (ulong *)&rom_log_addr) with
> 
> looks like it would conflate u32/ulong. While the code is fine,
> it is better to just use the correct types and forego the case.
> 
> While at it, let's guard against the ROM log pointer being NULL
> as well.
> 
> Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
> ---
> v1 -> v2:
>   - new patch
> ---
>  arch/arm/mach-imx/bootrom-cmd.c | 19 ++++++++++++++-----
>  1 file changed, 14 insertions(+), 5 deletions(-)

Applied, thanks

Sascha

> 
> diff --git a/arch/arm/mach-imx/bootrom-cmd.c b/arch/arm/mach-imx/bootrom-cmd.c
> index 0238d09b169f..63197e02ae2c 100644
> --- a/arch/arm/mach-imx/bootrom-cmd.c
> +++ b/arch/arm/mach-imx/bootrom-cmd.c
> @@ -51,6 +51,9 @@ static int imx8m_bootrom_decode_log(const u32 *rom_log)
>  {
>  	int i;
>  
> +	if (!rom_log)
> +		return -ENODATA;
> +
>  	for (i = 0; i < 128; i++) {
>  		u8 event_id = FIELD_GET(ROM_EVENT_FORMAT_V1_ID, rom_log[i]);
>  		u8 event_id_idx = FIELD_GET(ROM_EVENT_FORMAT_V1_ID_IDX, rom_log[i]);
> @@ -178,18 +181,19 @@ static int imx8m_bootrom_decode_log(const u32 *rom_log)
>  
>  static int do_bootrom(int argc, char *argv[])
>  {
> -	const struct imx_scratch_space *scratch = arm_mem_scratch_get();
> -	const u32 *rom_log_addr = scratch->bootrom_log;
> +	union {
> +		const u32 *ptr;
> +		ulong addr;
> +	} rom_log = { NULL };
>  	bool log = false;
>  	int ret, opt;
>  
>  	while((opt = getopt(argc, argv, "la:")) > 0) {
>  		switch(opt) {
>  		case 'a':
> -			ret = kstrtoul(optarg, 0, (ulong *)&rom_log_addr);
> +			ret = kstrtoul(optarg, 0, &rom_log.addr);
>  			if (ret)
>  				return ret;
> -			rom_log_addr = (const u32 *)rom_log_addr;
>  		case 'l':
>  			log = true;
>  			break;
> @@ -198,8 +202,13 @@ static int do_bootrom(int argc, char *argv[])
>  		}
>  	}
>  
> +	if (!rom_log.addr) {
> +		const struct imx_scratch_space *scratch = arm_mem_scratch_get();
> +		rom_log.ptr = scratch->bootrom_log;
> +	}
> +
>  	if (log)
> -		return imx8m_bootrom_decode_log(rom_log_addr);
> +		return imx8m_bootrom_decode_log(rom_log.ptr);
>  
>  	return COMMAND_ERROR_USAGE;
>  }
> -- 
> 2.30.2
> 
> 
> 

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