netdev - [PATCH v3 11/41] media/v4l2-core/mm: convert put_page() to put_user

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Message-Id: <20190807013340.9706-12-jhubbard@nvidia.com>
Date:   Tue,  6 Aug 2019 18:33:10 -0700
From:   john.hubbard@...il.com
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Christoph Hellwig <hch@...radead.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Dave Chinner <david@...morbit.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Ira Weiny <ira.weiny@...el.com>, Jan Kara <jack@...e.cz>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Jérôme Glisse <jglisse@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>,
        amd-gfx@...ts.freedesktop.org, ceph-devel@...r.kernel.org,
        devel@...verdev.osuosl.org, devel@...ts.orangefs.org,
        dri-devel@...ts.freedesktop.org, intel-gfx@...ts.freedesktop.org,
        kvm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-block@...r.kernel.org, linux-crypto@...r.kernel.org,
        linux-fbdev@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-media@...r.kernel.org, linux-mm@...ck.org,
        linux-nfs@...r.kernel.org, linux-rdma@...r.kernel.org,
        linux-rpi-kernel@...ts.infradead.org, linux-xfs@...r.kernel.org,
        netdev@...r.kernel.org, rds-devel@....oracle.com,
        sparclinux@...r.kernel.org, x86@...nel.org,
        xen-devel@...ts.xenproject.org, John Hubbard <jhubbard@...dia.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Hans Verkuil <hans.verkuil@...co.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Robin Murphy <robin.murphy@....com>,
        Souptick Joarder <jrdr.linux@...il.com>
Subject: [PATCH v3 11/41] media/v4l2-core/mm: convert put_page() to put_user_page*()

From: John Hubbard <jhubbard@...dia.com>

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: Mauro Carvalho Chehab <mchehab@...nel.org>
Cc: Kees Cook <keescook@...omium.org>
Cc: Hans Verkuil <hans.verkuil@...co.com>
Cc: Sakari Ailus <sakari.ailus@...ux.intel.com>
Cc: Jan Kara <jack@...e.cz>
Cc: Robin Murphy <robin.murphy@....com>
Cc: Souptick Joarder <jrdr.linux@...il.com>
Cc: Dan Williams <dan.j.williams@...el.com>
Cc: linux-media@...r.kernel.org
Signed-off-by: John Hubbard <jhubbard@...dia.com>
---
 drivers/media/v4l2-core/videobuf-dma-sg.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/media/v4l2-core/videobuf-dma-sg.c b/drivers/media/v4l2-core/videobuf-dma-sg.c
index 66a6c6c236a7..d6eeb437ec19 100644
--- a/drivers/media/v4l2-core/videobuf-dma-sg.c
+++ b/drivers/media/v4l2-core/videobuf-dma-sg.c
@@ -349,8 +349,7 @@ int videobuf_dma_free(struct videobuf_dmabuf *dma)
 	BUG_ON(dma->sglen);
 
 	if (dma->pages) {
-		for (i = 0; i < dma->nr_pages; i++)
-			put_page(dma->pages[i]);
+		put_user_pages(dma->pages, dma->nr_pages);
 		kfree(dma->pages);
 		dma->pages = NULL;
 	}
-- 
2.22.0