Revert "msm: kgsl: set vm_pgoff of vma to zero"

This reverts commit 4f14bca.

Signed-off-by: TogoFire <togofire@mailfence.com>
Change-Id: I371fcb8c3a3b2c09b2f2353fdc72d27b5d076152

drivers/gpu/msm/kgsl.c

@@ -4280,15 +4280,6 @@ static int kgsl_mmap(struct file *file, struct vm_area_struct *vma)
 
 	atomic_inc(&entry->map_count);
 
-	/*
-	 * kgsl gets the entry id or the gpu address through vm_pgoff.
-	 * It is used during mmap and never needed again. But this vm_pgoff
-	 * has different meaning at other parts of kernel. Not setting to
-	 * zero will let way for wrong assumption when tried to unmap a page
-	 * from this vma.
-	 */
-	vma->vm_pgoff = 0;
-
 	trace_kgsl_mem_mmap(entry, vma->vm_start);
 	return 0;
 }