# Re: Small fix for 2.4 md.c - using device information before lock\_dev()

- From: Neil Brown \<hidden\>
- Date: 2003-03-13 00:54:27 
- List: linux-raid
- Page: https://ratatoskr.run/linux-raid/2003/03/6587779
- Thread: https://ratatoskr.run/linux-raid/2003/03/6587779/t.md

```text
On Wednesday March 12, lmb@suse.de wrote:
> Good morning,
> 
> I've been testing md under UML. It appears that UML is exposing a minor bug in
> md.c: it is trying to use information about the device (in particular,
> blk_sizes[]) before having imported it (which calls lock_dev() and thus makes
> the information available in the first place).
> 
> This was exposed because UML resets the blk_sizes[] information to zero on
> ubd_release().
> 
> Working patch attached; it just reorders the function calls. Please apply to
> 2.4 if appropriate.
> 

Thanks ... that's a subtle one.  
It appears not be be an issue with 2.5 as you cannot even get at the
size before doing the bdget - which is good.

I'll send it to Marcelo.

NeilBrown
```