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rapidio: use get_user_pages_unlocked()

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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 <lstoakes@gmail.com>
Acked-by: Alexandre Bounine <alexandre.bounine@idt.com>
Cc: Matt Porter <mporter@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Lorenzo Stoakes 2017-02-27 14:27:34 -08:00 • committed by Linus Torvalds
parent 464920104b
commit 369f2679f7
1 changed files with 5 additions and 6 deletions
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11
drivers/rapidio/devices/rio_mport_cdev.c
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@ -889,17 +889,16 @@ rio_dma_transfer(struct file *filp, u32 transfer_mode,
goto err_req; goto err_req;
} }
down_read(&current->mm->mmap_sem); pinned = get_user_pages_unlocked(
pinned = get_user_pages(
(unsigned long)xfer->loc_addr & PAGE_MASK, (unsigned long)xfer->loc_addr & PAGE_MASK,
nr_pages, nr_pages,
dir == DMA_FROM_DEVICE ? FOLL_WRITE : 0, page_list,
page_list, NULL); dir == DMA_FROM_DEVICE ? FOLL_WRITE : 0);
up_read(&current->mm->mmap_sem);
if (pinned != nr_pages) { if (pinned != nr_pages) {
if (pinned < 0) { if (pinned < 0) {
rmcd_error("get_user_pages err=%ld", pinned); rmcd_error("get_user_pages_unlocked err=%ld",
pinned);
nr_pages = 0; nr_pages = 0;
} else } else
rmcd_error("pinned %ld out of %ld pages", rmcd_error("pinned %ld out of %ld pages",