msm: kgsl: Remove 'fd' dependency to get dma_buf handle

Get the dma_buf handle directly from 'vm_file' after
doing necessary checks on the file.

Change-Id: Id5eec16588d64e4e28483b32bb52d4d3d9b86b99
Signed-off-by: ravnar <[email protected]>
Signed-off-by: Sanjay Yadav <[email protected]>

Author: ravnar

drivers/gpu/msm/kgsl.c

@@ -2165,15 +2165,6 @@ static int kgsl_setup_anon_useraddr(struct kgsl_pagetable *pagetable,
 	return ret;
 }
 
-static int match_file(const void *p, struct file *file, unsigned int fd)
-{
-	/*
-	 * We must return fd + 1 because iterate_fd stops searching on
-	 * non-zero return, but 0 is a valid fd.
-	 */
-	return (p == file) ? (fd + 1) : 0;
-}
-
 static void _setup_cache_mode(struct kgsl_mem_entry *entry,
 		struct vm_area_struct *vma)
 {
@@ -2212,8 +2203,6 @@ static int kgsl_setup_dmabuf_useraddr(struct kgsl_device *device,
 	vma = find_vma(current->mm, hostptr);
 
 	if (vma && vma->vm_file) {
-		int fd;
-
 		ret = check_vma_flags(vma, entry->memdesc.flags);
 		if (ret) {
 			up_read(&current->mm->mmap_sem);
@@ -2229,10 +2218,13 @@ static int kgsl_setup_dmabuf_useraddr(struct kgsl_device *device,
 			return -EFAULT;
 		}
 
-		/* Look for the fd that matches this the vma file */
-		fd = iterate_fd(current->files, 0, match_file, vma->vm_file);
-		if (fd != 0)
-			dmabuf = dma_buf_get(fd - 1);
+		/*
+		 * Take a refcount because dma_buf_put() decrements the
+		 * refcount
+		 */
+		get_file(vma->vm_file);
+
+		dmabuf = vma->vm_file->private_data;
 	}
 
 	if (IS_ERR_OR_NULL(dmabuf)) {