[Xen-devel] [PATCH 15/34] staging/vc04_services: convert put_page() to put_user_page*()

[john.hubbard@xxxxxxxxx]

From: John Hubbard <jhubbard@xxxxxxxxxx>

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

This is part a tree-wide conversion, as described in commit fc1d8e7cca2d
("mm: introduce put_user_page*(), placeholder versions").

Cc: Eric Anholt <eric@xxxxxxxxxx>
Cc: Stefan Wahren <stefan.wahren@xxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: Mihaela Muraru <mihaela.muraru21@xxxxxxxxx>
Cc: Suniel Mahesh <sunil.m@xxxxxxxxxxxx>
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: Sidong Yang <realwakka@xxxxxxxxx>
Cc: Kishore KP <kishore.p@xxxxxxxxxxxx>
Cc: linux-rpi-kernel@xxxxxxxxxxxxxxxxxxx
Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
Cc: devel@xxxxxxxxxxxxxxxxxxxx
Signed-off-by: John Hubbard <jhubbard@xxxxxxxxxx>
---
 .../vc04_services/interface/vchiq_arm/vchiq_2835_arm.c | 10 ++--------
 1 file changed, 2 insertions(+), 8 deletions(-)

diff --git a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c 
b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c
index 61c69f353cdb..ec92b4c50e95 100644
--- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c
+++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c
@@ -336,10 +336,7 @@ cleanup_pagelistinfo(struct vchiq_pagelist_info 
*pagelistinfo)
        }
 
        if (pagelistinfo->pages_need_release) {
-               unsigned int i;
-
-               for (i = 0; i < pagelistinfo->num_pages; i++)
-                       put_page(pagelistinfo->pages[i]);
+               put_user_pages(pagelistinfo->pages, pagelistinfo->num_pages);
        }
 
        dma_free_coherent(g_dev, pagelistinfo->pagelist_buffer_size,
@@ -454,10 +451,7 @@ create_pagelist(char __user *buf, size_t count, unsigned 
short type)
                                       __func__, actual_pages, num_pages);
 
                        /* This is probably due to the process being killed */
-                       while (actual_pages > 0) {
-                               actual_pages--;
-                               put_page(pages[actual_pages]);
-                       }
+                       put_user_pages(pages, actual_pages);
                        cleanup_pagelistinfo(pagelistinfo);
                        return NULL;
                }
-- 
2.22.0


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