dma_pin_iovec_pages() calls get_user_pages() for each iovec. If get_user_pages() returns a number smaller than the requested number, dma_pin_iovec_pages() calls dma_unpin_iovec_pages(). It releases previously allocated iovecs, but pages pinned by last get_user_pages() call remain unreleased. Fix this by calling put_page() for each such page.
Signed-off-by: Roman Gushchin <[email protected]> --- drivers/dma/iovlock.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/dma/iovlock.c b/drivers/dma/iovlock.c index bb48a57..c393cf9 100644 --- a/drivers/dma/iovlock.c +++ b/drivers/dma/iovlock.c @@ -107,8 +107,11 @@ struct dma_pinned_list *dma_pin_iovec_pages(struct iovec *iov, size_t len) NULL); up_read(¤t->mm->mmap_sem); - if (ret != page_list->nr_pages) + if (ret != page_list->nr_pages) { + for (i = 0; i < ret; i++) + put_page(page_list->pages[i]); goto unpin; + } local_list->nr_iovecs = i + 1; } -- 1.9.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
