[U-Boot] [PATCH] mtd, ubi: set free_count to zero before walking through erase list

[Boris Brezillon <boris.brezillon@free-electrons.com>]

On Tue,  2 Feb 2016 11:54:35 +0100
Heiko Schocher <hs@denx.de> wrote:

> Set free_count to zero before walking through ai->erase list
> in wl_init().
> 
> As U-Boot has no workqueue/threads, it immediately calls
> erase_worker(), which increase for each erased block
> free_count. Without this patch, free_count gets after
> this initialized to zero in wl_init(), so the free_count
> variable always has the maybe wrong value 0.
> 
> Detected this behaviour on the dxr2 board, where the
> UBI fastmap gets not written when attaching/dettaching
> on an empty NAND. It drops instead the error message:
> 
> could not find any anchor PEB
> 
> With this patch, fastmap gets written on dettach.

I ran into the same problem, and produced the exact same patch to
fix it, so

Reviewed-by: Boris Brezillon <boris.brezillon@free-electrons.com>

> 
> Signed-off-by: Heiko Schocher <hs@denx.de>
> ---
> added Richard to this EMail, as maybe this could be a problem
> in linux too ... ?
> 
>  drivers/mtd/ubi/wl.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/mtd/ubi/wl.c b/drivers/mtd/ubi/wl.c
> index 507b091..e823ca5 100644
> --- a/drivers/mtd/ubi/wl.c
> +++ b/drivers/mtd/ubi/wl.c
> @@ -1528,6 +1528,7 @@ int ubi_wl_init(struct ubi_device *ubi, struct ubi_attach_info *ai)
>  		INIT_LIST_HEAD(&ubi->pq[i]);
>  	ubi->pq_head = 0;
>  
> +	ubi->free_count = 0;
>  	list_for_each_entry_safe(aeb, tmp, &ai->erase, u.list) {
>  		cond_resched();
>  
> @@ -1546,7 +1547,6 @@ int ubi_wl_init(struct ubi_device *ubi, struct ubi_attach_info *ai)
>  		found_pebs++;
>  	}
>  
> -	ubi->free_count = 0;
>  	list_for_each_entry(aeb, &ai->free, u.list) {
>  		cond_resched();
>  



-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com