On Tue, Mar 8, 2011 at 6:46 AM, David Cohen <dacohen@xxxxxxxxx> wrote:
> From: Michael Jones <michael.jones@xxxxxxxxxxxxxxxx>
>
> commit c7f4ab26e3bcdaeb3e19ec658e3ad9092f1a6ceb allowed mapping
> the NULL address if da_start==0, which would then not get unmapped.
> Disallow this again. And spell variable 'alignment' correctly.
>
> Signed-off-by: Michael Jones <michael.jones@xxxxxxxxxxxxxxxx>
> ---
> arch/arm/plat-omap/iovmm.c | 16 ++++++++++------
> 1 files changed, 10 insertions(+), 6 deletions(-)
>
> diff --git a/arch/arm/plat-omap/iovmm.c b/arch/arm/plat-omap/iovmm.c
> index 6dc1296..11c9b76 100644
> --- a/arch/arm/plat-omap/iovmm.c
> +++ b/arch/arm/plat-omap/iovmm.c
> @@ -271,20 +271,24 @@ static struct iovm_struct *alloc_iovm_area(struct iommu *obj, u32 da,
> size_t bytes, u32 flags)
> {
> struct iovm_struct *new, *tmp;
> - u32 start, prev_end, alignement;
> + u32 start, prev_end, alignment;
>
> if (!obj || !bytes)
> return ERR_PTR(-EINVAL);
>
> start = da;
> - alignement = PAGE_SIZE;
> + alignment = PAGE_SIZE;
>
> if (flags & IOVMF_DA_ANON) {
> - start = obj->da_start;
> + /* Don't map address 0 */
> + if (obj->da_start)
> + start = obj->da_start;
> + else
> + start = obj->da_start + alignment;
else part obj->da_star is always 0, so why not?
start = alignment;
so, why I understand, it now it is possible mapp address 0x0 only if
IOVMF_DA_ANON is not set, right? maybe that would be mention in the
patch.
Regards,
Fernando.
>
> if (flags & IOVMF_LINEAR)
> - alignement = iopgsz_max(bytes);
> - start = roundup(start, alignement);
> + alignment = iopgsz_max(bytes);
> + start = roundup(start, alignment);
> } else if (start < obj->da_start || start > obj->da_end ||
> obj->da_end - start < bytes) {
> return ERR_PTR(-EINVAL);
> @@ -304,7 +308,7 @@ static struct iovm_struct *alloc_iovm_area(struct iommu *obj, u32 da,
> goto found;
>
> if (tmp->da_end >= start && flags & IOVMF_DA_ANON)
> - start = roundup(tmp->da_end + 1, alignement);
> + start = roundup(tmp->da_end + 1, alignment);
>
> prev_end = tmp->da_end;
> }
> --
> 1.7.0.4
>
>
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