[v2,1/3] omap: iovmm: disallow mapping NULL address when IOVMF_DA_ANON is set
Commit Message
From: Michael Jones <michael.jones@matrix-vision.de>
commit c7f4ab26e3bcdaeb3e19ec658e3ad9092f1a6ceb allowed mapping the NULL
address if da_start==0, which would then not get unmapped. Disallow
this again if IOVMF_DA_ANON is set. And spell variable 'alignment'
correctly.
Signed-off-by: Michael Jones <michael.jones@matrix-vision.de>
---
arch/arm/plat-omap/iovmm.c | 16 ++++++++++------
1 files changed, 10 insertions(+), 6 deletions(-)
Comments
On Tue, Mar 8, 2011 at 2:15 PM, David Cohen <dacohen@gmail.com> wrote:
> From: Michael Jones <michael.jones@matrix-vision.de>
>
> commit c7f4ab26e3bcdaeb3e19ec658e3ad9092f1a6ceb allowed mapping the NULL
> address if da_start==0, which would then not get unmapped. Disallow
> this again if IOVMF_DA_ANON is set. And spell variable 'alignment'
> correctly.
>
> Signed-off-by: Michael Jones <michael.jones@matrix-vision.de>
> ---
> 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..e5f8341 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 = alignment;
looks good to me, just a nitpick comment, that would look better
start = (obj->da_start) ? obj->da_start : alignment;
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
>
>
--
To unsubscribe from this list: send the line "unsubscribe linux-media" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
On 03/08/2011 09:31 PM, Guzman Lugo, Fernando wrote:
> On Tue, Mar 8, 2011 at 2:15 PM, David Cohen <dacohen@gmail.com> wrote:
>> From: Michael Jones <michael.jones@matrix-vision.de>
>>
>> commit c7f4ab26e3bcdaeb3e19ec658e3ad9092f1a6ceb allowed mapping the NULL
>> address if da_start==0, which would then not get unmapped. Disallow
>> this again if IOVMF_DA_ANON is set. And spell variable 'alignment'
>> correctly.
>>
>> Signed-off-by: Michael Jones <michael.jones@matrix-vision.de>
>> ---
>> 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..e5f8341 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 = alignment;
>
> looks good to me, just a nitpick comment, that would look better
>
> start = (obj->da_start) ? obj->da_start : alignment;
>
> 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
>>
Hi David,
These changes to my patch are fine with me. If you want to incorporate
Fernando's recommendation above, too, go ahead.
-Michael
MATRIX VISION GmbH, Talstrasse 16, DE-71570 Oppenweiler
Registergericht: Amtsgericht Stuttgart, HRB 271090
Geschaeftsfuehrer: Gerhard Thullner, Werner Armingeon, Uwe Furtner
--
To unsubscribe from this list: send the line "unsubscribe linux-media" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
@@ -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 = alignment;
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;
}