Re: [PATCH net-next] net/ncsi: Add NCSI Mellanox OEM command

From: David Miller
Date: Wed Nov 21 2018 - 19:54:56 EST


From: Vijay Khemka <vijaykhemka@xxxxxx>
Date: Tue, 20 Nov 2018 12:35:16 -0800

> +static int ncsi_oem_gma_handler_mlx(struct ncsi_cmd_arg *nca)
> +{
> + unsigned char data[NCSI_OEM_MLX_CMD_GMA_LEN];
> + int ret = 0;
> +
> + nca->payload = NCSI_OEM_MLX_CMD_GMA_LEN;
> +
> + memset(data, 0, NCSI_OEM_MLX_CMD_GMA_LEN);
> + *(unsigned int *)data = ntohl(NCSI_OEM_MFR_MLX_ID);

'data' is not necessarily aligned on an unsigned int boundary.

But second of all you want to use a fixed size type like "u32" or
similar here, not "unsigned int".

Altogether, something like:

union {
u8 data_u8[NCSI_OEM_MLX_CMD_GMA_LEN];
u32 data_u32[[NCSI_OEM_MLX_CMD_GMA_LEN / sizeof(u32)];
} u;

memset(&u, 0, sizeof(u));
u.data_u32[0] = ntohl(NCSI_OEM_MFR_MLX_ID);
u.data_u8[5] = NCSI_OEM_MLX_CMD_GMA;
u.data_u8[6] = NCSI_OEM_MLX_CMD_GMA_PARAM;

If the rest of the ncsi driver has crud like this, it all needs
to be fixed up similarly.