Subject: Re: [PATCH v2 05/36] mtd: nand: Add a NAND page I/O request type

From: Boris Brezillon <[email-masked]>
Date: Sun, 31 Mar 2019 13:23:19 +0200

On Mon,  4 Mar 2019 23:28:10 +0100
Miquel Raynal <[email-masked]> wrote:

> Use an enum to differentiate the type of I/O (reading or writing a
> page). Also update the request iterator.
> 
> Signed-off-by: Miquel Raynal <[email-masked]>
> ---
>  drivers/mtd/nand/spi/core.c |  4 ++--
>  include/linux/mtd/nand.h    | 13 +++++++++++--
>  2 files changed, 13 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/mtd/nand/spi/core.c b/drivers/mtd/nand/spi/core.c
> index ed5e340dff51..9ee192585854 100644
> --- a/drivers/mtd/nand/spi/core.c
> +++ b/drivers/mtd/nand/spi/core.c
> @@ -558,7 +558,7 @@ static int spinand_mtd_read(struct mtd_info *mtd, loff_t from,
>  
>  	mutex_lock(&spinand->lock);
>  
> -	nanddev_io_for_each_page(nand, from, ops, &iter) {
> +	nanddev_io_for_each_page(nand, NAND_PAGE_READ, from, ops, &iter) {
>  		ret = spinand_select_target(spinand, iter.req.pos.target);
>  		if (ret)
>  			break;
> @@ -606,7 +606,7 @@ static int spinand_mtd_write(struct mtd_info *mtd, loff_t to,
>  
>  	mutex_lock(&spinand->lock);
>  
> -	nanddev_io_for_each_page(nand, to, ops, &iter) {
> +	nanddev_io_for_each_page(nand, NAND_PAGE_WRITE, to, ops, &iter) {
>  		ret = spinand_select_target(spinand, iter.req.pos.target);
>  		if (ret)
>  			break;
> diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h
> index 30f0fb02abe2..84ab76f34c74 100644
> --- a/include/linux/mtd/nand.h
> +++ b/include/linux/mtd/nand.h
> @@ -82,8 +82,14 @@ struct nand_pos {
>  	unsigned int page;
>  };
>  
> +enum nand_page_io_req_type {
> +	NAND_PAGE_READ = 0,
> +	NAND_PAGE_WRITE,
> +};

Please add a kernel doc header. Once done you can add

Reviewed-by: Boris Brezillon <[email-masked]>

> +
>  /**
>   * struct nand_page_io_req - NAND I/O request object
> + * @type: the type of page I/O: read or write
>   * @pos: the position this I/O request is targeting
>   * @dataoffs: the offset within the page
>   * @datalen: number of data bytes to read from/write to this page
> @@ -99,6 +105,7 @@ struct nand_pos {
>   * specific commands/operations.
>   */
>  struct nand_page_io_req {
> +	enum nand_page_io_req_type type;
>  	struct nand_pos pos;
>  	unsigned int dataoffs;
>  	unsigned int datalen;
> @@ -624,11 +631,13 @@ static inline void nanddev_pos_next_page(struct nand_device *nand,
>   * layer.
>   */
>  static inline void nanddev_io_iter_init(struct nand_device *nand,
> +					enum nand_page_io_req_type reqtype,
>  					loff_t offs, struct mtd_oob_ops *req,
>  					struct nand_io_iter *iter)
>  {
>  	struct mtd_info *mtd = nanddev_to_mtd(nand);
>  
> +	iter->req.type = reqtype;
>  	iter->req.mode = req->mode;
>  	iter->req.dataoffs = nanddev_offs_to_pos(nand, offs, &iter->req.pos);
>  	iter->req.ooboffs = req->ooboffs;
> @@ -698,8 +707,8 @@ static inline bool nanddev_io_iter_end(struct nand_device *nand,
>   *
>   * Should be used for iterate over pages that are contained in an MTD request.
>   */
> -#define nanddev_io_for_each_page(nand, start, req, iter)		\
> -	for (nanddev_io_iter_init(nand, start, req, iter);		\
> +#define nanddev_io_for_each_page(nand, type, start, req, iter)		\
> +	for (nanddev_io_iter_init(nand, type, start, req, iter);	\
>  	     !nanddev_io_iter_end(nand, iter);				\
>  	     nanddev_io_iter_next_page(nand, iter))
>  

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