Hi,
[snip]
> Sorry, I should've mentioned: I'm using your media-0005-omap3isp branch
> based on 2.6.38-rc5. I didn't have the problem with 2.6.37, either.
> It's actually not related to mis-configuring the ISP pipeline like I
> thought at first- it also happens after I have successfully captured images.
>
> I've since tracked down the problem, although I don't understand the
> cache management well enough to be sure it's a proper fix, so hopefully
> some new recipients on this can make suggestions/comments.
>
> The patch below solves the problem, which modifies a commit by Fernando
> Guzman Lugo from December.
>
> -Michael
>
> From db35fb8edca2a4f8fd37197d77fd58676cb1dcac Mon Sep 17 00:00:00 2001
> From: Michael Jones <michael.jo...@matrix-vision.de>
> Date: Thu, 3 Mar 2011 16:50:39 +0100
> Subject: [PATCH] fix iovmm slab cache error on module unload
>
> modify "OMAP: iommu: create new api to set valid da range"
>
> This modifies commit c7f4ab26e3bcdaeb3e19ec658e3ad9092f1a6ceb.
> ---
> arch/arm/plat-omap/iovmm.c | 5 ++++-
> 1 files changed, 4 insertions(+), 1 deletions(-)
>
> diff --git a/arch/arm/plat-omap/iovmm.c b/arch/arm/plat-omap/iovmm.c
> index 6dc1296..2fba6f1 100644
> --- a/arch/arm/plat-omap/iovmm.c
> +++ b/arch/arm/plat-omap/iovmm.c
> @@ -280,7 +280,10 @@ static struct iovm_struct *alloc_iovm_area(struct iommu
> *obj, u32 da,
> alignement = PAGE_SIZE;
>
> if (flags & IOVMF_DA_ANON) {
> - start = obj->da_start;
> + /*
> + * Reserve the first page for NULL
> + */
> + start = obj->da_start + PAGE_SIZE;
IMO if obj->da_start != 0, no need to add PAGE_SIZE. Otherwise, it
does make sense to correct wrong obj->da_start == 0. Another thing is
this piece of code is using alignement (alignment) variable instead of
PAGE_SIZE (which is the same value).
Br,
David
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