On Tue, Mar 8, 2011 at 9:53 PM, Guzman Lugo, Fernando <fernando.lugo@xxxxxx> wrote: > On Tue, Mar 8, 2011 at 1:06 PM, David Cohen <dacohen@xxxxxxxxx> wrote: >> On Tue, Mar 8, 2011 at 8:06 PM, Guzman Lugo, Fernando >> <fernando.lugo@xxxxxx> wrote: >>> 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. ÂAnd spell variable 'alignment' correctly. >>>> >>>> Signed-off-by: Michael Jones <michael.jones@xxxxxxxxxxxxxxxx> >>>> --- >>>> Âarch/arm/plat-omap/iovmm.c | Â 16 ++++++++++------ >>>> Â1 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, >>>> Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â size_t bytes, u32 flags) >>>> Â{ >>>> Â Â Â Âstruct iovm_struct *new, *tmp; >>>> - Â Â Â u32 start, prev_end, alignement; >>>> + Â Â Â u32 start, prev_end, alignment; >>>> >>>> Â Â Â Âif (!obj || !bytes) >>>> Â Â Â Â Â Â Â Âreturn ERR_PTR(-EINVAL); >>>> >>>> Â Â Â Âstart = da; >>>> - Â Â Â alignement = PAGE_SIZE; >>>> + Â Â Â alignment = PAGE_SIZE; >>>> >>>> Â Â Â Âif (flags & IOVMF_DA_ANON) { >>>> - Â Â Â Â Â Â Â start = obj->da_start; >>>> + Â Â Â Â Â Â Â /* Don't map address 0 */ >>>> + Â Â Â Â Â Â Â if (obj->da_start) >>>> + Â Â Â Â Â Â Â Â Â Â Â start = obj->da_start; >>>> + Â Â Â Â Â Â Â else >>>> + Â Â Â Â Â Â Â Â Â Â Â start = obj->da_start + alignment; >>> >>> else part obj->da_star is always 0, so why not? >>> start = alignment; >> >> The patch is not from me, but I can fix it if Michael agrees. >> >>> >>> 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. >> >> Indeed address 0x0 was never meant to be mapped. The mentioned commit >> on the patch's description did that without noticing. But the new >> change is documented in the code by the comment "Don't map address 0" > > yeah, but it only applies when "flags & IOVMF_DA_ANON", So if I use > IOVMF_DA_FIXED and da_start == 0, I will be able to map some area > which starts from address 0x0, right? Âif so, that looks good to me > and the description should mention that if is disallowing mapping > address 0x0 when IOVMF_DA_ANON is used. Yes, that's the case. I will update the comment. I hope Michael does not complain about the changes. :) Br, David > > Regards, > Fernando. > >> and it's also mentioned on the patch description. Is it OK for you? >> >> Regards, >> >> David Cohen >> >>> >>> Regards, >>> Fernando. >>> >>>> >>>> Â Â Â Â Â Â Â Âif (flags & IOVMF_LINEAR) >>>> - Â Â Â Â Â Â Â Â Â Â Â alignement = iopgsz_max(bytes); >>>> - Â Â Â Â Â Â Â start = roundup(start, alignement); >>>> + Â Â Â Â Â Â Â Â Â Â Â alignment = iopgsz_max(bytes); >>>> + Â Â Â Â Â Â Â start = roundup(start, alignment); >>>> Â Â Â Â} else if (start < obj->da_start || start > obj->da_end || >>>> Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Âobj->da_end - start < bytes) { >>>> Â Â Â Â Â Â Â Âreturn ERR_PTR(-EINVAL); >>>> @@ -304,7 +308,7 @@ static struct iovm_struct *alloc_iovm_area(struct iommu *obj, u32 da, >>>> Â Â Â Â Â Â Â Â Â Â Â Âgoto found; >>>> >>>> Â Â Â Â Â Â Â Âif (tmp->da_end >= start && flags & IOVMF_DA_ANON) >>>> - Â Â Â Â Â Â Â Â Â Â Â start = roundup(tmp->da_end + 1, alignement); >>>> + Â Â Â Â Â Â Â Â Â Â Â start = roundup(tmp->da_end + 1, alignment); >>>> >>>> Â Â Â Â Â Â Â Âprev_end = tmp->da_end; >>>> Â Â Â Â} >>>> -- >>>> 1.7.0.4 >>>> >>>> >>> >> > -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html