staging: kpc2000: Convert put_page() to put_user_page*()

For pages that were retained via get_user_pages*(), release those pages
via the new put_user_page*() routines, instead of via put_page().

This is part a tree-wide conversion, as described in commit fc1d8e7c
("mm: introduce put_user_page*(), placeholder versions").

Cc: Ira Weiny <ira.weiny@intel.com>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Jérôme Glisse <jglisse@redhat.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Matt Sickler <Matt.Sickler@daktronics.com>
Cc: devel@driverdev.osuosl.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-mm@kvack.org
Reviewed-by: John Hubbard <jhubbard@nvidia.com>
Signed-off-by: Bharath Vedartham <linux.bhar@gmail.com>
Link: https://lore.kernel.org/r/1564058658-3551-1-git-send-email-linux.bhar@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/kpc2000/kpc_dma/fileops.c

@@ -190,9 +190,7 @@ static int kpc_dma_transfer(struct dev_private_data *priv,
 	sg_free_table(&acd->sgt);
  err_dma_map_sg:
  err_alloc_sg_table:
-	for (i = 0 ; i < acd->page_count ; i++) {
-		put_page(acd->user_pages[i]);
-	}
+	put_user_pages(acd->user_pages, acd->page_count);
  err_get_user_pages:
 	kfree(acd->user_pages);
  err_alloc_userpages:
@@ -211,16 +209,13 @@ void  transfer_complete_cb(struct aio_cb_data *acd, size_t xfr_count, u32 flags)
 	BUG_ON(acd->ldev == NULL);
 	BUG_ON(acd->ldev->pldev == NULL);
 
-	for (i = 0 ; i < acd->page_count ; i++) {
-		if (!PageReserved(acd->user_pages[i])) {
-			set_page_dirty(acd->user_pages[i]);
-		}
-	}
-
 	dma_unmap_sg(&acd->ldev->pldev->dev, acd->sgt.sgl, acd->sgt.nents, acd->ldev->dir);
 
-	for (i = 0 ; i < acd->page_count ; i++) {
-		put_page(acd->user_pages[i]);
+	for (i = 0; i < acd->page_count; i++) {
+		if (!PageReserved(acd->user_pages[i]))
+			put_user_pages_dirty(&acd->user_pages[i], 1);
+		else
+			put_user_page(acd->user_pages[i]);
 	}
 
 	sg_free_table(&acd->sgt);