This code was using get_user_pages*(), in approximately a "Case 1"
scenario (Direct IO), using the categorization from [1]. That means
that it's time to convert the get_user_pages*() + put_page() calls to
pin_user_pages*() + unpin_user_pages() calls.
There is some helpful background in [2]: basically, this is a small
part of fixing a long-standing disconnect between pinning pages, and
file systems' use of those pages.
[1] Documentation/core-api/pin_user_pages.rst
[2] "Explicit pinning of user-space pages":
https://lwn.net/Articles/807108/
Cc: Derek Kiernan <[email protected]>
Cc: Dragan Cvetic <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Cc: Michal Simek <[email protected]>
Cc: [email protected]
Signed-off-by: John Hubbard <[email protected]>
---
drivers/misc/xilinx_sdfec.c | 11 +++++------
1 file changed, 5 insertions(+), 6 deletions(-)
diff --git a/drivers/misc/xilinx_sdfec.c b/drivers/misc/xilinx_sdfec.c
index 7e2ee3e547f2..cda3559025d5 100644
--- a/drivers/misc/xilinx_sdfec.c
+++ b/drivers/misc/xilinx_sdfec.c
@@ -627,12 +627,11 @@ static int xsdfec_table_write(struct xsdfec_dev *xsdfec,
u32 offset,
nr_pages = n;
- res = get_user_pages_fast((unsigned long)src_ptr, nr_pages, 0, pages);
+ res = pin_user_pages_fast((unsigned long)src_ptr, nr_pages, 0, pages);
if (res < nr_pages) {
- if (res > 0) {
- for (i = 0; i < res; i++)
- put_page(pages[i]);
- }
+ if (res > 0)
+ unpin_user_pages(pages, res);
+
return -EINVAL;
}
@@ -646,7 +645,7 @@ static int xsdfec_table_write(struct xsdfec_dev *xsdfec,
u32 offset,
reg++;
} while ((reg < len) &&
((reg * XSDFEC_REG_WIDTH_JUMP) % PAGE_SIZE));
- put_page(pages[i]);
+ unpin_user_page(pages[i]);
}
return 0;
}
--
2.26.2
