linux-kernel - Re: [PATCH v3 4/9] mtd: rawnand: denali: switch over to ->exec

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Date:   Tue, 12 Mar 2019 10:02:57 +0100
From:   Boris Brezillon <boris.brezillon@...labora.com>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     linux-mtd@...ts.infradead.org,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Boris Brezillon <bbrezillon@...nel.org>,
        Brian Norris <computersforpeace@...il.com>,
        linux-kernel@...r.kernel.org, Marek Vasut <marek.vasut@...il.com>,
        Richard Weinberger <richard@....at>,
        David Woodhouse <dwmw2@...radead.org>
Subject: Re: [PATCH v3 4/9] mtd: rawnand: denali: switch over to ->exec_op()
 from legacy hooks

On Tue, 12 Mar 2019 17:44:45 +0900
Masahiro Yamada <yamada.masahiro@...ionext.com> wrote:


> +
> +static int denali_exec_instr(struct nand_chip *chip,
> +			     const struct nand_op_instr *instr)
> +{
> +	struct denali_nand_info *denali = to_denali(chip);
> +	bool width16 = chip->options & NAND_BUSWIDTH_16;
> +
> +	switch (instr->type) {
> +	case NAND_OP_CMD_INSTR:
> +		denali_exec_out8(denali, DENALI_MAP11_CMD,
> +				 &instr->ctx.cmd.opcode, 1);
> +		return 0;
> +	case NAND_OP_ADDR_INSTR:
> +		denali_exec_out8(denali, DENALI_MAP11_ADDR,
> +				 instr->ctx.addr.addrs,
> +				 instr->ctx.addr.naddrs);
> +		return 0;
> +	case NAND_OP_DATA_IN_INSTR:
> +		(!instr->ctx.data.force_8bit && width16 ?
> +		 denali_exec_in16 :
> +		 denali_exec_in8)(denali, DENALI_MAP11_DATA,
> +				  instr->ctx.data.buf.in,
> +				  instr->ctx.data.len);

I agree with Miquel, this statement tends to obfuscate the code, and
it's not like an extra if will make a huge difference in term of LOC.
	

> +		return 0;
> +	case NAND_OP_DATA_OUT_INSTR:
> +		(!instr->ctx.data.force_8bit && width16 ?
> +		 denali_exec_out16 :
> +		 denali_exec_out8)(denali, DENALI_MAP11_DATA,
> +				   instr->ctx.data.buf.out,
> +				   instr->ctx.data.len);

Ditto.

> +		return 0;
> +	case NAND_OP_WAITRDY_INSTR:
> +		return denali_exec_waitrdy(denali);
> +	default:
> +		WARN_ONCE(1, "unsupported NAND instruction type: %d\n",
> +			  instr->type);
> +
> +		return -EINVAL;
> +	}
> +}