From 369f2679f7e73996bf29ecd3ec79df3cce1be27d Mon Sep 17 00:00:00 2001 From: Lorenzo Stoakes Date: Mon, 27 Feb 2017 14:27:34 -0800 Subject: [PATCH] rapidio: use get_user_pages_unlocked() Moving from get_user_pages() to get_user_pages_unlocked() simplifies the code and takes advantage of VM_FAULT_RETRY functionality when faulting in pages. Link: http://lkml.kernel.org/r/20170103205024.6704-1-lstoakes@gmail.com Signed-off-by: Lorenzo Stoakes Acked-by: Alexandre Bounine Cc: Matt Porter Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/rapidio/devices/rio_mport_cdev.c | 11 +++++------ 1 file changed, 5 insertions(+), 6 deletions(-) diff --git a/drivers/rapidio/devices/rio_mport_cdev.c b/drivers/rapidio/devices/rio_mport_cdev.c index 9013a585507e..50b617af81bd 100644 --- a/drivers/rapidio/devices/rio_mport_cdev.c +++ b/drivers/rapidio/devices/rio_mport_cdev.c @@ -889,17 +889,16 @@ rio_dma_transfer(struct file *filp, u32 transfer_mode, goto err_req; } - down_read(¤t->mm->mmap_sem); - pinned = get_user_pages( + pinned = get_user_pages_unlocked( (unsigned long)xfer->loc_addr & PAGE_MASK, nr_pages, - dir == DMA_FROM_DEVICE ? FOLL_WRITE : 0, - page_list, NULL); - up_read(¤t->mm->mmap_sem); + page_list, + dir == DMA_FROM_DEVICE ? FOLL_WRITE : 0); if (pinned != nr_pages) { if (pinned < 0) { - rmcd_error("get_user_pages err=%ld", pinned); + rmcd_error("get_user_pages_unlocked err=%ld", + pinned); nr_pages = 0; } else rmcd_error("pinned %ld out of %ld pages", -- 2.20.1