[PATCH v4 12/21] misc: open-dice: replace deprecated mmap hook with mmap_prepare

The f_op->mmap interface is deprecated, so update driver to use its
successor, mmap_prepare.

The driver previously used vm_iomap_memory(), so this change replaces it
with its mmap_prepare equivalent, mmap_action_simple_ioremap().

Reviewed-by: Suren Baghdasaryan <[email protected]>
Signed-off-by: Lorenzo Stoakes (Oracle) <[email protected]>
---
 drivers/misc/open-dice.c | 19 +++++++++++--------
 1 file changed, 11 insertions(+), 8 deletions(-)

diff --git a/drivers/misc/open-dice.c b/drivers/misc/open-dice.c
index 24c29e0f00ef..45060fb4ea27 100644
--- a/drivers/misc/open-dice.c
+++ b/drivers/misc/open-dice.c
@@ -86,29 +86,32 @@ static ssize_t open_dice_write(struct file *filp, const char __user *ptr,
 /*
  * Creates a mapping of the reserved memory region in user address space.
  */
-static int open_dice_mmap(struct file *filp, struct vm_area_struct *vma)
+static int open_dice_mmap_prepare(struct vm_area_desc *desc)
 {
+	struct file *filp = desc->file;
 	struct open_dice_drvdata *drvdata = to_open_dice_drvdata(filp);
 
-	if (vma->vm_flags & VM_MAYSHARE) {
+	if (vma_desc_test(desc, VMA_MAYSHARE_BIT)) {
 		/* Do not allow userspace to modify the underlying data. */
-		if (vma->vm_flags & VM_WRITE)
+		if (vma_desc_test(desc, VMA_WRITE_BIT))
 			return -EPERM;
 		/* Ensure userspace cannot acquire VM_WRITE later. */
-		vm_flags_clear(vma, VM_MAYWRITE);
+		vma_desc_clear_flags(desc, VMA_MAYWRITE_BIT);
 	}
 
 	/* Create write-combine mapping so all clients observe a wipe. */
-	vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
-	vm_flags_set(vma, VM_DONTCOPY | VM_DONTDUMP);
-	return vm_iomap_memory(vma, drvdata->rmem->base, drvdata->rmem->size);
+	desc->page_prot = pgprot_writecombine(desc->page_prot);
+	vma_desc_set_flags(desc, VMA_DONTCOPY_BIT, VMA_DONTDUMP_BIT);
+	mmap_action_simple_ioremap(desc, drvdata->rmem->base,
+				   drvdata->rmem->size);
+	return 0;
 }
 
 static const struct file_operations open_dice_fops = {
 	.owner = THIS_MODULE,
 	.read = open_dice_read,
 	.write = open_dice_write,
-	.mmap = open_dice_mmap,
+	.mmap_prepare = open_dice_mmap_prepare,
 };
 
 static int __init open_dice_probe(struct platform_device *pdev)
-- 
2.53.0