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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/[email protected]
Signed-off-by: Lorenzo Stoakes <[email protected]>
Acked-by: Alexandre Bounine <[email protected]>
Cc: Matt Porter <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Lorenzo Stoakes authored and Linus Torvalds committed 2017-02-27 18:43:45 -08:00
1 parent 464920104b
commit 369f2679f7
1 file changed
+5 -6
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drivers/rapidio/devices/rio_mport_cdev.c
+5 -6
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@@ -889,17 +889,16 @@ rio_dma_transfer(struct file *filp, u32 transfer_mode,
goto err_req;
}
down_read(&current->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(&current->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",