[PATCH v2.6.34-rc2] s3c: Fix CONFIG_MTD_NAND_S3C2410_CLKSTOP

[Ben Dooks]

On Tue, May 04, 2010 at 09:13:41AM +0200, christian pellegrin wrote:
> On Tue, May 4, 2010 at 8:57 AM, Ben Dooks <ben-linux at fluff.org> wrote:
> >
> > please let me know why you feel the need to use test_and_set_bit on
> > a variable that is single use.
> >
> 
> As I mentioned in the description the select function is not called in
> a balanced way by upper layers, so there is a need to count it in the
> driver (otherwise you end by calling clk_disable too many times if I
> remember well). Perhaps the atomic operations are not needed but I'm
> not sure about this so I preferred to take the cautionary approach (I
> haven't studied if calls to select are serialized in the upper MTD
> layer or even the block layer). Feel free to use a simple integer, but
> I confirm that something like this patch is needed in 2.6.33 and
> 2.6.34 if you want clock stopping enabled.

I don't belive that atomic ops are needed, IIRC the mtd layer should
sort that out. As such test_and_set_bit is hardly a count?
 
> Thanks,
> 
> -- 
> Christian Pellegrin, see http://www.evolware.org/chri/
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-- 
-- 
Ben

Q:      What's a light-year?
A:      One-third less calories than a regular year.