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SubjectRe: [PATCH v3 1/8] scpi: Add cmd indirection table to prepare for legacy commands
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Hi Neil,

On 07/09/16 16:34, Neil Armstrong wrote:
> Add indirection table to permit multiple command values for legacy support.
>

I wrote the most of the patch and you changed the author too ;)

> Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
> ---
> drivers/firmware/arm_scpi.c | 145 ++++++++++++++++++++++++++++++++++++++------
> 1 file changed, 127 insertions(+), 18 deletions(-)
>
> diff --git a/drivers/firmware/arm_scpi.c b/drivers/firmware/arm_scpi.c
> index 4388937..9a87687 100644
> --- a/drivers/firmware/arm_scpi.c
> +++ b/drivers/firmware/arm_scpi.c

[..]

> @@ -161,6 +194,7 @@ struct scpi_drvinfo {
> u32 protocol_version;
> u32 firmware_version;
> int num_chans;
> + int *scpi_cmds;
> atomic_t next_chan;
> struct scpi_ops *scpi_ops;
> struct scpi_chan *channels;
> @@ -390,6 +424,19 @@ static u32 scpi_get_version(void)
> return scpi_info->protocol_version;
> }
>
> +static inline int check_cmd(unsigned int offset)
> +{
> + if (offset >= CMD_MAX_COUNT ||

If we call scpi_send_message internally(as it's static) why is this
check needed ?


> + !scpi_info ||
> + !scpi_info->scpi_cmds)

Will be even reach to this point if above is true ?

> + return -EINVAL;
> +
> + if (scpi_info->scpi_cmds[offset] < 0)
> + return -EOPNOTSUPP;

IMO just above couple of lines in the beginning of scpi_send_message
will suffice. You can just add this to my original patch.

> static int
> scpi_clk_get_range(u16 clk_id, unsigned long *min, unsigned long *max)
> {
> @@ -397,8 +444,13 @@ scpi_clk_get_range(u16 clk_id, unsigned long *min, unsigned long *max)
> struct clk_get_info clk;
> __le16 le_clk_id = cpu_to_le16(clk_id);
>
> - ret = scpi_send_message(SCPI_CMD_GET_CLOCK_INFO, &le_clk_id,
> - sizeof(le_clk_id), &clk, sizeof(clk));
> + ret = check_cmd(CMD_GET_CLOCK_INFO);
> + if (ret)
> + return ret;
> +

It's totally unnecessary to add check in each and every function calling
scpi_send_message, why not add it to scpi_send_message instead.

--
Regards,
Sudeep

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