Re: [PATCH] mtd: fix calculating partition end address

[Miquel Raynal <miquel.raynal@xxxxxxxxxxx>]

Hi Rafał,

Rafał Miłecki <rafal@xxxxxxxxxx> wrote on Mon, 09 Mar 2020 15:19:10
+0100:

> On 2020-03-09 15:04, Miquel Raynal wrote:
> > Rafał Miłecki <zajec5@xxxxxxxxx> wrote on Mon,  9 Mar 2020 08:44:45
> > +0100:
> >   
> >> From: Rafał Miłecki <rafal@xxxxxxxxxx>  
> >> >> This fixes check for partitions that don't start at beginning of their  
> >> parents. Missing partition's offset in formula could result in forcing
> >> read-only incorrectly.  
> >> >> Fixes: 6750f61a13a0 ("mtd: improve calculating partition boundaries >> when checking for alignment")  
> >> Signed-off-by: Rafał Miłecki <rafal@xxxxxxxxxx>
> >> ---
> >>  drivers/mtd/mtdpart.c | 2 +-
> >>  1 file changed, 1 insertion(+), 1 deletion(-)  
> >> >> diff --git a/drivers/mtd/mtdpart.c b/drivers/mtd/mtdpart.c  
> >> index 7328c066c5ba..c683b432cc5e 100644
> >> --- a/drivers/mtd/mtdpart.c
> >> +++ b/drivers/mtd/mtdpart.c
> >> @@ -524,7 +524,7 @@ static struct mtd_part *allocate_partition(struct >> mtd_info *parent,
> >>  			part->name);
> >>  	}  
> >> >> -	tmp = part_absolute_offset(parent) + slave->mtd.size;  
> >> +	tmp = part_absolute_offset(parent) + slave->offset + >> slave->mtd.size;  
> > 
> > I think you are doing the change at the wrong place, if you want to
> > check where the partition *starts* you should do it a few lines above.
> > But I think the check should be here as well, probably.  
> 
> The check where the partition *starts* is OK and I don't mean to change
> it. The bug is about calculating absolute *end* address of partition.
> 
> 
> > Anyway, I just applied on my local tree a patch rewriting a bit the
> > partitioning scheme, could you please rebase on top of today's
> > mtd/next and resend this patch updated?
> > 
> > Here is the change that I've done at this place:
> > 	-       tmp = part_absolute_offset(parent) + slave->mtd.size;
> > 	+       tmp = mtd_get_master_ofs(child, 0) + child->size;  
> 
> I'll give it a try.

I would like to apply your fix this week, do you think you can rebase
and resend soon?

Thanks,
Miquèl

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