[U-Boot] [PATCH 1/9] mtd: Add a function to report when the MTD dev list has been updated

[Boris Brezillon]

Crap! I forgot to pass -v2 to git format patch.

On Mon, 19 Nov 2018 12:51:13 +0100
Boris Brezillon <boris.brezillon at bootlin.com> wrote:

> We need to parse mtdparts/mtids again everytime a device has been
> added/removed from the MTD list, but there's currently no way to know
> when such an update has been done.
> 
> Add an ->updated field to the idr struct that we set to true every time
> a device is added/removed and expose a function returning the value
> of this field and resetting it to false.
> 
> Signed-off-by: Boris Brezillon <boris.brezillon at bootlin.com>
> ---
> Changes in v2:
> - None
> ---
>  drivers/mtd/mtdcore.c   | 16 +++++++++++++++-
>  include/linux/mtd/mtd.h |  1 +
>  2 files changed, 16 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c
> index fb6c779abbfe..7a15ded8c883 100644
> --- a/drivers/mtd/mtdcore.c
> +++ b/drivers/mtd/mtdcore.c
> @@ -87,14 +87,17 @@ struct idr_layer {
>  
>  struct idr {
>  	struct idr_layer id[MAX_IDR_ID];
> +	bool updated;
>  };
>  
>  #define DEFINE_IDR(name)	struct idr name;
>  
>  void idr_remove(struct idr *idp, int id)
>  {
> -	if (idp->id[id].used)
> +	if (idp->id[id].used) {
>  		idp->id[id].used = 0;
> +		idp->updated = true;
> +	}
>  
>  	return;
>  }
> @@ -134,6 +137,7 @@ int idr_alloc(struct idr *idp, void *ptr, int start, int end, gfp_t gfp_mask)
>  		if (idl->used == 0) {
>  			idl->used = 1;
>  			idl->ptr = ptr;
> +			idp->updated = true;
>  			return i;
>  		}
>  		i++;
> @@ -155,6 +159,16 @@ struct mtd_info *__mtd_next_device(int i)
>  }
>  EXPORT_SYMBOL_GPL(__mtd_next_device);
>  
> +bool mtd_dev_list_updated(void)
> +{
> +	if (mtd_idr.updated) {
> +		mtd_idr.updated = false;
> +		return true;
> +	}
> +
> +	return false;
> +}
> +
>  #ifndef __UBOOT__
>  static LIST_HEAD(mtd_notifiers);
>  
> diff --git a/include/linux/mtd/mtd.h b/include/linux/mtd/mtd.h
> index 68e591532492..d20ebd820289 100644
> --- a/include/linux/mtd/mtd.h
> +++ b/include/linux/mtd/mtd.h
> @@ -581,6 +581,7 @@ int mtd_arg_off_size(int argc, char *const argv[], int *idx, loff_t *off,
>  void mtd_get_len_incl_bad(struct mtd_info *mtd, uint64_t offset,
>  			  const uint64_t length, uint64_t *len_incl_bad,
>  			  int *truncated);
> +bool mtd_dev_list_updated(void);
>  
>  /* drivers/mtd/mtd_uboot.c */
>  int mtd_search_alternate_name(const char *mtdname, char *altname,