msm: kgsl: Fix Z180 memory leak

Decerement entry refcount, which incremented
in kgsl_sharedmem_find_region.

CRs-Fixed: 635747
Change-Id: I621ba8f8e119a9ab8ba5455b28a565e3cae2f7cd
Signed-off-by: Hareesh Gundu <hareeshg@codeaurora.org>
msm: kgsl: fix a race condition when calling kref_put

Fix a race condition which can occur if a thread tries to acquire
a reference to a mem_entry or context while another thread has
already decremented the refcount to 0 and is in the process of
destroying said mem_entry or context.

CRs-Fixed: 635747
Change-Id: I6be64ca75f9cb12b03e870b9ca83588197c64e5e
Signed-off-by: Hareesh Gundu <hareeshg@codeaurora.org>
msm: kgsl: don't use sscanf()

Friends do not let friends use sscanf().

CRs-Fixed: 563605
Change-Id: Ic0dedbad56af5bbee4fc833701d8bc93b118efa9
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
Signed-off-by: Ananta Kishore K <akollipa@codeaurora.org>
msm: kgsl: Remove sscanf() from kgsl_pwrctrl.c

Replace sscanf() in kgsl_pwrctrl.c with a generic function to safely
convert 32 bit unsigned ints.

CRs-fixed: 563585
Change-Id: Ic0dedbad10e2264ec8fccab622d094d123b49b77
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
msm: kgsl: Get reference to process private when attaching mem entry

When a memory entry is attached with to a process private list then
increment the refcount of the process private structure so that the
structure is valid as long as the entry is around. The context
structure is also handled in similar manner. Also, the refcount to
the entry needs to be decremented when the handle that created the
entry goes away and not when the process private structure is
destroyed.

Conflicts:
        drivers/gpu/msm/kgsl.c

Change-Id: I225698ad4081947a93eb553104e5259bbf31f293
Signed-off-by: Shubhraprakash Das <sadas@codeaurora.org>
Signed-off-by: Hareesh Gundu <hareeshg@codeaurora.org>