From: John Hubbard <jhubbard@xxxxxxxxxx> For code that retains pages via get_user_pages*(), release those pages via the new release_user_pages(), instead of calling put_page(). This prepares for eventually fixing the problem described in [1], and is following a plan listed in [2]. [1] https://lwn.net/Articles/753027/ : "The Trouble with get_user_pages()" [2] https://lkml.kernel.org/r/20180709080554.21931-1-jhubbard@xxxxxxxxxx Proposed steps for fixing get_user_pages() + DMA problems. CC: Al Viro <viro@xxxxxxxxxxxxxxxxxx> Signed-off-by: John Hubbard <jhubbard@xxxxxxxxxx> --- drivers/platform/goldfish/goldfish_pipe.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/platform/goldfish/goldfish_pipe.c b/drivers/platform/goldfish/goldfish_pipe.c index fad0345376e0..1e9455a86698 100644 --- a/drivers/platform/goldfish/goldfish_pipe.c +++ b/drivers/platform/goldfish/goldfish_pipe.c @@ -340,8 +340,9 @@ static void __release_user_pages(struct page **pages, int pages_count, for (i = 0; i < pages_count; i++) { if (!is_write && consumed_size > 0) set_page_dirty(pages[i]); - put_page(pages[i]); } + + release_user_pages(pages, pages_count); } /* Populate the call parameters, merging adjacent pages together */ -- 2.19.0
