Regression for NOR flash with multiple erase block regions

[Chris Packham]

Hi Mathias,

On 23/09/17 01:12, Mathias Thore wrote:
> Hello,
> 
> Commit 1eeef2d7483a7e3f8d2dd2a5b9939b3b814dc549 included in Linux 4.13 ( 
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/mtd/mtdpart.c?h=v4.13&id=1eeef2d7483a7e3f8d2dd2a5b9939b3b814dc549 
> ) introduces a regression for NOR flash with multiple erase block 
> regions of different sizes.
> 
> Only the largest erase block size seems to be considered when 
> determining if partitions are aligned. Partitions in smaller regions 
> will be mounted as read-only. With Linux 4.12 and earlier, read/write 
> access was available for these partitions.

Sorry about that. I think a fix would be to re-calculate the 
wr_alignment as we're looking at each erase block. Unfortunately I'm 
about to get on a plane for 13 hours so I'm pretty much a write off for 
the next couple of days.

I'll take a look when I get back on-line unless Boris beats me to it.