ion: invalidate cache after zero'ing buffers even if uncached

Currently, we don't invalidate the cache if we're working with uncached
buffers. However, the memory for those mappings might actually be stale
in the cache since someone else might have touched it. Just invalidate
the cache for everyone, cached or uncached.

Without this change, corruption was observed on the display due to stale
data in graphics buffers from Ion.

CRs-Fixed: 585524
Change-Id: I0037beaadfde983af15d8f45918f7798264dd3ca
Signed-off-by: Mitchel Humpherys <mitchelh@codeaurora.org>
msm: kgsl: Add arch_mmap_check() stub definition

Add a stub definition for arch_mmap_check() in kgsl.c for
situations where the function is not defined, similar to the
stub definition in mm/mmap.c

Change-Id: I2d0f7f8c76f35cbec1554893433199e256f76df4
Signed-off-by: Shrenuj Bansal <shrenujb@codeaurora.org>
msm: kgsl: Remove cpu_is_msm8960() check

The check in the code will always evaluate to true now that we
don't support A-family and does not affect the if statement that
uses it.

Change-Id: Ifdf88cc0305eb64a6a50f72a23e69239173ee4c6
Signed-off-by: Shrenuj Bansal <shrenujb@codeaurora.org>
gpu: ion: fix use-after-free in ion_heap_freelist_drain

The `buffer' variable is being used after being freed. Fix this.

Change-Id: Iea3471fa7dc7535bbf0620c1639fea2008d7cf19
Signed-off-by: Mitchel Humpherys <mitchelh@codeaurora.org>
msm: kgsl: Fix the NULL context submission size

When submitting commands with a NULL context the size may not be
calculated properly. Fix this calculation.

Change-Id: Idcc37772349673da8a9b9d5127f88946ced8fff6
Signed-off-by: Lynus Vaz <lvaz@codeaurora.org>