Re: [PATCH 1/4] mm: cma: Don't crash on allocation if CMA area can't be activated

[Joonsoo Kim <iamjoonsoo.kim@lge.com>]

On Fri, Oct 24, 2014 at 10:02:49AM +0800, Weijie Yang wrote:
> On Fri, Oct 24, 2014 at 7:42 AM, Laurent Pinchart
> <laurent.pinchart@ideasonboard.com> wrote:
> > Hi Michal,
> >
> > On Thursday 23 October 2014 18:53:36 Michal Nazarewicz wrote:
> >> On Thu, Oct 23 2014, Laurent Pinchart wrote:
> >> > If activation of the CMA area fails its mutex won't be initialized,
> >> > leading to an oops at allocation time when trying to lock the mutex. Fix
> >> > this by failing allocation if the area hasn't been successfully actived,
> >> > and detect that condition by moving the CMA bitmap allocation after page
> >> > block reservation completion.
> >> >
> >> > Signed-off-by: Laurent Pinchart
> >> > <laurent.pinchart+renesas@ideasonboard.com>
> >>
> >> Cc: <stable@vger.kernel.org>  # v3.17
> >> Acked-by: Michal Nazarewicz <mina86@mina86.com>
> 
> This patch is good, but how about add a active field in cma struct?
> use cma->active to check whether cma is actived successfully.
> I think it will make code more clear and readable.
> Just my little opinion.
> 

Or just setting cma->count to 0 would work fine.

Thanks.

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